Faculty Profiles - YOSHIMI Akihiro

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YOSHIMI Akihiro

Organization

Research Institute for Interdisciplinary Science Associate Professor

Homepage

http://kaken.nii.ac.jp/d/r/40333314.ja.html

External link

Degree

博士（理学） ( 東京工業大学大学院 )

Research Interests

永久電気双極子モーメント(EDM)
共鳴核励起
核スピン歳差
外部フィードバック
低周波発振
原子核(実験)
原子磁力計
周波数安定度
非線形磁気光学効果
希ガス元素^<129>Xe
原子を利用した基本的対称性
時間反転対称性の破れ
229Th
磁気シールド
低周波核スピンメーザー
スピン偏極
CP対称性の破れ
スピン歳差
CP非保存
磁場の安定化
素粒子実験
ニュートリノ物理
量子コヒーレンス
光ポンピング法
能動的フィードバック
標準模型
核スピンメーザー
核スピン偏極
放射光実験
アイソマー(核異性体)
ランタノイドドープ結晶
Superradiance

Research Areas

Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Education

東京工業大学大学院理工学研究科応用物理学専攻博士課程

1997.4 - 2000.3

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東京工業大学大学院理工学研究科応用物理学専攻修士課程

1995.4 - 1997.3

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Tokyo Institute of Technology 理学部応用物理学科

1991.4 - 1995.3

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Research History

Okayama University Associate Professor

2011.10

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RIKEN

2011.4 - 2011.9

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理化学研究所研究員

2003.7 - 2011.3

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理化学研究所協力研究員

2003.4 - 2003.6

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理化学研究所基礎科学特別研究員

2000.4 - 2003.3

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Professional Memberships

THE PHYSICAL SOCIETY OF JAPAN

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原子核談話会

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原子衝突学会

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Committee Memberships

日本物理学会領域運営委員（実験核物理領域）

2015.10 - 2016.9

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Committee type：Academic society

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Papers

Experimental apparatus for detection of radiative decay of $$^{229}$$Th isomer from Th-doped CaF$$_2$$

Takahiro Hiraki, Kjeld Beeks, Michael Bartokos, Hiroyuki Fujimoto, Yuta Fukunaga, Hiromitsu Haba, Yoshitaka Kasamatsu, Shinji Kitao, Adrian Leitner, Takahiko Masuda, Guan Ming, Nobumoto Nagasawa, Ryoichiro Ogake, Koichi Okai, Martin Pimon, Martin Pressler, Noboru Sasao, Fabian Schaden, Thorsten Schumm, Makoto Seto, Yudai Shigekawa, Koutaro Shimizu, Tomas Sikorsky, Kenji Tamasaku, Sayuri Takatori, Tsukasa Watanabe, Atsushi Yamaguchi, Yoshitaka Yoda, Akihiro Yoshimi, Koji Yoshimura

Hyperfine Interactions 245 ( 1 ) 2024.1

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/s10751-024-01844-x

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Other Link： https://link.springer.com/article/10.1007/s10751-024-01844-x/fulltext.html
Periodic superradiance in an Er:YSO crystal

Hideaki Hara, Junseok Han, Yasutaka Imai, Noboru Sasao, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura, Yuki Miyamoto

Physical Review Research 2024.1

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Publishing type：Research paper (scientific journal)

DOI： 10.1103/PhysRevResearch.6.013005

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Vacuum Tltraviolet Search from Thorium-229 Isomer in Crystal Toward Solid-State Nuclear Clock

S. Takatori, Y. Fukunaga, M. Guan, T. Hiraki, T. Masuda, R. Ogake, K. Okai, N. Sasao, K. Shimizu, S. Uetake, A. Yoshimi, K. Yoshimura, M. Yoshimura, K. Tamasaku, Y. Kasamatsu, Y. Yasuda, K. Beeks, F. Schaden, T. Schumm, S. Kitao, M. Seto, H. Fujimoto, T. Watanabe, K. Konashi, M. Watanabe, H. Haba, Y. Shigekawa, A. Yamaguchi, N. Nagasawa, Y. Yoda

2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) 2023.5

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Publishing type：Research paper (international conference proceedings) Publisher：IEEE

DOI： 10.1109/eftf/ifcs57587.2023.10272086

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Quantum dots as a probe of fundamental physics: deviation from exponential decay law Reviewed

Akihiro Yoshimi, Minoru Tanaka, Motohiko Yoshimura

The European Physical Journal D 76 113 2022.7

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1140/epjd/s10053-022-00437-z

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Parity violating magnetization at neutrino pair emission using trivalent lanthanoid ions Reviewed

Hideaki Hara, Akihiro Yoshimi, Motohiko Yoshimura

Physical Review D 104 ( 11 ) 2021.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

DOI： 10.1103/PhysRevD.104.115006

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.104.115006/fulltext
Estimation of radiative half-life of Th229m by half-life measurement of other nuclear excited states in Th229

Y. Shigekawa, A. Yamaguchi, K. Suzuki, H. Haba, T. Hiraki, H. Kikunaga, T. Masuda, S. Nishimura, N. Sasao, A. Yoshimi, K. Yoshimura

Physical Review C 104 ( 2 ) 2021.8

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Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

DOI： 10.1103/physrevc.104.024306

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevC.104.024306/fulltext
Absolute X-ray energy measurement using a high-accuracy angle encoder

Takahiko Masuda, Tsukasa Watanabe, Kjeld Beeks, Hiroyuki Fujimoto, Takahiro Hiraki, Hiroyuki Kaino, Shinji Kitao, Yuki Miyamoto, Koichi Okai, Noboru Sasao, Makoto Seto, Thorsten Schumm, Yudai Shigekawa, Kenji Tamasaku, Satoshi Uetake, Atsushi Yamaguchi, Yoshitaka Yoda, Akihiro Yoshimi, Koji Yoshimura

Journal of Synchrotron Radiation 28 ( 1 ) 111 - 119 2021.1

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Publishing type：Research paper (scientific journal) Publisher：International Union of Crystallography ({IUCr})

<jats:p>This paper presents an absolute X-ray photon energy measurement method that uses a Bond diffractometer. The proposed system enables the prompt and rapid <jats:italic>in situ</jats:italic> measurement of photon energies over a wide energy range. The diffractometer uses a reference silicon single-crystal plate and a highly accurate angle encoder called SelfA. The performance of the system is evaluated by repeatedly measuring the energy of the first excited state of the potassium-40 nuclide. The excitation energy is determined as 29829.39 (6) eV, and this is one order of magnitude more accurate than the previous measurement. The estimated uncertainty of the photon energy measurement was 0.7 p.p.m. as a standard deviation and the maximum observed deviation was 2 p.p.m.</jats:p>

DOI： 10.1107/s1600577520014526

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Neutrino mass spectroscopy using Er3+ ions placed at inversion center of host crystals

H. Hara, N. Sasao, A. Yoshimi, M. Yoshimura

arXiv:1910.14318v1 2019.10

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Language：English

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Energy response of X-rays under high flux conditions using a thin APD for the energy range of 6–33 keV Reviewed

T. Masuda, T. Hiraki, H. Kaino, S. Kishimoto, Y. Miyamoto, K. Okai, S. Okubo, R. Ozaki, N. Sasao, K. Suzuki, S. Uetake, A. Yoshimi, K. Yoshimura

Nucl. Instrum. Methods Phys. Res. A. 913 72 - 77 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

This paper reports on the demonstration of a high-rate energy measurement technique using a thin depletion layer silicon avalanche photodiode (Si-APD). A dedicated amplitude-to-time converter is developed to realize simultaneous energy and timing measurement in a high rate condition. The energy response of the system is systematically studied by using monochromatic X-ray beam with an incident energy ranging from 6 to 33 keV. The obtained energy spectra contain clear peaks and tail distributions. The peak fraction monotonously decreases as the incident photon energy increases. This phenomenon can be explained by considering the distribution of the energy deposit in silicon, which is investigated by using a Monte Carlo simulation.

DOI： 10.1016/j.nima.2018.10.029

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Geometry-dependent spectra and coherent-transient measurement of nearly degenerate four-wave mixing using two-photon resonance Reviewed

H. Hara, Y. Miyamoto, T. Hiraki, K. Imamura, T. Masuda, N. Sasao, S. Uetake, A. Yoshimi, K. Yoshimura, M. Yoshimura

J. Physics B 52 ( 23 ) 235402 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

We study nearly degenerate four-wave mixing using a two-photon-allowed vibrational transition of parahydrogen. A signal photon is generated by a trigger photon and coherence among parahydrogen, which is prepared by two counterpropagating pump pulses, and we investigate the dependence of the signal pulse energy on the trigger frequency. The measured spectra depend on the geometry, shifting depending on the direction of the signal pulse and on the small angle formed by the counterpropagating pump pulses. Furthermore, we investigate the dependence of signal pulse energy on the incident time of the trigger pulse. The measured signal pulse energy is high if the trigger pulse is delayed slightly with respect to the pump pulses. We demonstrate that these geometry-dependent spectra and coherent-transient response can be explained by using simple models.

DOI： 10.1088/1361-6455/ab4a6e

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Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses Reviewed

T. Hiraki, H. Hara, Y. Miyamoto, K. Imamura, T. Masuda, N. Sasao, S. Uetake, A. Yoshimi, K. Yoshimura, M. Yoshimura

J. Phys. B 52 ( 4 ) 045401 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

We observed two-photon emission (TPE) signal from the first vibrationally excited state of parahydrogen gas coherently excited by counter-propagating laser pulses. A single narrow-linewidth laser source has roles in the excitation of the parahydrogen molecules and the induction of the TPE process. We measured dependences of the signal energy on the detuning, target gas pressure, and input pulse energies. These results are qualitatively consistent with those obtained by numerical simulations based on Maxwell-Bloch equations with one spatial dimension and one temporal dimension. This study of the TPE process in the counterpropagating injection scheme is an important step toward neutrino mass spectroscopy.

DOI： 10.1088/1361-6455/aafbd0

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X-ray pumping of the 229Th nuclear clock isomer Reviewed

T. Masuda, A. Yoshimi, A. Fujieda, H. Fujimoto, H. Haba, H. Hara, T. Hiraki, H. Kaino, Y. Kasamatsu, S. Kitao, K. Konashi, Y. Miyamoto, K. Okai, S. Okubo, N. Sasao, M. Seto, T. Schumm, Y. Shigekawa, K. Suzuki, S. Stellmer, K. Tamasaku, S. Uetake, M. Watanabe, T. Watanabe, Y. Yasuda, A. Yamaguchi, Y. Yoda, T. Yokokita, M. Yoshimura, K. Yoshimura

Nature 573 ( 7773 ) 238 - 242 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1038/s41586-019-1542-3

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Other Link： http://www.nature.com/articles/s41586-019-1542-3
Development of co-located 129Xe and 131Xe nuclear spin masers with external feedback scheme Reviewed

T. Sato, Y. Ichikawa, S. Kojima, C. Funayama, S. Tanaka, T. Inoue, A. Uchiyama, A. Gladkov, A. Takamine, Y. Sakamoto, Y. Ohtomo, C. Hirao, M. Chikamori, E. Hikota, T. Suzuki, M. Tsuchiya, T. Furukawa, A. Yoshimi, C. P. Bidinosti, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama, N. Yoshinaga, Y. Sakemi, K. Asahi

Physics Letters, Section A: General, Atomic and Solid State Physics 382 ( 8 ) 588 - 594 2018.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier B.V.

We report on the operation of co-located 129Xe and 131Xe nuclear spin masers with an external feedback scheme, and discuss the use of 131Xe as a comagnetometer in measurements of the 129Xe spin precession frequency. By applying a correction based on the observed change in the 131Xe frequency, the frequency instability due to magnetic field and cell temperature drifts are eliminated by two orders of magnitude. The frequency precision of 6.2 μHz is obtained for a 104 s averaging time, suggesting the possibility of future improvement to ≈ 1 nHz by improving the signal-to-noise ratio of the observation.

DOI： 10.1016/j.physleta.2017.12.003

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Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of Hg 201 Reviewed

A. Yoshimi, H. Hara, T. Hiraki, Y. Kasamatsu, S. Kitao, Y. Kobayashi, K. Konashi, R. Masuda, T. Masuda, Y. Miyamoto, K. Okai, S. Okubo, R. Ozaki, N. Sasao, O. Sato, M. Seto, T. Schumm, Y. Shigekawa, S. Stellmer, K. Suzuki, S. Uetake, M. Watanabe, A. Yamaguchi, Y. Yasuda, Y. Yoda, K. Yoshimura, M. Yoshimura

Physical Review C 97 ( 2 ) 024607 2018.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society

Nuclear resonant excitation and detection of its decay signal for the 26.27-keV level of Hg201 is demonstrated with high-brilliance synchrotron radiation (SR) and a fast x-ray detector system. This SR-based photonuclear excitation scheme, known as nuclear resonant scattering (NRS) in the field of materials science, is also useful for investigating nuclear properties, such as the half-lives and radiative widths of excited nuclear levels. To date, because of the limited time response of the x-ray detector, the nuclear levels to which this method could be applied have been limited to the one whose half-lives are longer than ∼1 ns. The faster time response of the NRS measurement makes possible NRS experiments on nuclear levels with much shorter half-lives. We have fabricated an x-ray detector system that has a time resolution of 56 ps and a shorter tail function than that reported previously. With the implemented detector system, the NRS signal of the 26.27-keV state of Hg201 could be clearly discriminated from the electronic scattering signal at an elapsed time of 1 ns after the SR pulse. The half-life of the state was determined as 629 ± 18 ps, which has better precision by a factor of three compared with that reported to date obtained from nuclear decay spectroscopy.

DOI： 10.1103/PhysRevC.97.024607

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Vibrational excitation of hydrogen molecules by two-photon absorption and third-harmonic generation Reviewed

Yuki Miyamoto, Hideaki Hara, Takahiro Hiraki, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 51 ( 1 ) 015401 2018.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

We report the coherent excitation of the vibrational state of hydrogen molecules by two-photon absorption and the resultant third-harmonic generation (THG). Parahydrogen molecules cooled by liquid nitrogen are irradiated by mid-infrared nanosecond pulses at 4.8 mu m with a nearly Fourier-transform-limited linewidth. The first excited vibrational state of parahydrogen is populated by two-photon absorption of the mid-infrared photons. Because of the narrow linewidth of the mid-infrared pulses, coherence between the ground and excited states is sufficient to induce higher-order processes. Near-infrared photons from the THG are observed at 1.6 mu m. The dependence of the intensity of the near-infrared radiation on mid-infrared pulse energy, target pressure, and cell length is determined. We used a simple formula for THG with consideration of realistic experimental conditions to explain the observed results.

DOI： 10.1088/1361-6455/aa9782

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Frequency dependence of coherently amplified two-photon emission from hydrogen molecules Reviewed

Hideaki Hara, Yuki Miyamoto, Takahiro Hiraki, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

PHYSICAL REVIEW A 96 ( 6 ) 063827 2017.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We investigate how the efficiency of coherently amplified two-photon emission depends on the frequency of one of the two emitted photons, namely the signal photon. This is done over the wavelength range of 5.048-10.21 mu m by using the vibrational transition of parahydrogen. The efficiency increases with the frequency of the signal photon. Considering experimental errors, our results are consistent with the theoretical prediction for the present experimental conditions. This study is an experimental demonstration of the frequency dependence of coherently amplified two-photon emission, and also presents its potential as a light source.

DOI： 10.1103/PhysRevA.96.063827

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A new method of creating high intensity neutron source Reviewed

T. Masuda, A. Yoshimi, M. Yoshimura

INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS 26 ( 11 ) 1750076 2017.11

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Language：English Publishing type：Research paper (scientific journal) Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

We propose a new scheme of producing an intense neutron beam whose yields may exceed those of the existing facilities by a few to several orders of magnitude in the sub-eV region. This scheme employs a MeV gamma beam extracted from circulating quantum ions, which has been recently proposed. The gamma beam is directed to a deuteron target and the photo-disintegration process generates a neutron beam. The calculated neutron energy spectrum is nearly flat down to the neV range, and thus there exists a possibility to utilize a good quality of neutrons especially in sub-eV energy region without using a moderator.

DOI： 10.1142/S0218301317500768

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Fast x-ray detector system with simultaneous measurement of timing and energy for a single photon Reviewed

T. Masuda, S. Okubo, H. Hara, T. Hiraki, S. Kitao, Y. Miyamoto, K. Okai, R. Ozaki, N. Sasao, M. Seto, S. Uetake, A. Yamaguchi, Y. Yoda, A. Yoshimi, K. Yoshimura

REVIEW OF SCIENTIFIC INSTRUMENTS 88 ( 6 ) 063105 2017.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

We developed a fast X-ray detector system for nuclear resonant scattering (NRS) experiments. Our system employs silicon avalanche photo-diode (Si-APD) as a fast X-ray sensor. The system is able to acquire both timing and energy of a single X-ray photon simultaneously in a high rate condition, 106 counts per second for one Si-APD. The performance of the system was investigated in SPring-8, a synchrotron radiation facility in Japan. Good time resolution of 120 ps (FWHM) was achieved with a slight tail distribution in the time spectrum by a level of 10(-9) at 1 ns apart from the peak. Using this system, we successfully observed the NRS from the 26.27-keV level of mercury-201, which has a half-life of 630(50) ps. We also demonstrated the reduction of background events caused by radioactive decays in a radioactive sample by discriminating photon energy. Published by AIP Publishing.

DOI： 10.1063/1.4989405

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Development Of 131Xe Co-magnetometry For Xe Atomic EDM Search

Tomoya Sato, Yuichi Ichikawa, Shuichiro Kojima, Chikako Funayama, Shunya Tanaka, Yu Sakamoto, Yuichi Ohtomo, Chika Hirao, Masatoshi Chikamori, Eri Hikota, Takeshi Furukawa, Akihiro Yoshimi, Christopher Paul Bidinosti, Takashi Ino, Hideki Ueno, Yukari Matsuo, Takeshi Fukuyama, Koichiro Asahi

Proceedings of The 26th International Nuclear Physics Conference — PoS(INPC2016) 2017.5

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Publishing type：Research paper (international conference proceedings) Publisher：Sissa Medialab

DOI： 10.22323/1.281.0174

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Vibrational Two-Photon Emission from Coherently Excited Solid Parahydrogen Reviewed

Yuki Miyamoto, Hideaki Hara, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

JOURNAL OF PHYSICAL CHEMISTRY A 121 ( 20 ) 3943 - 3951 2017.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

We report the observation of two-photon emission from a coherently excited vibrational state of solid parahydrogen, which is also a known quantum solid. Coherence between the ground and the excited states is prepared by stimulated Raman scattering using two visible laser pulses. The two-photon emission is triggered by another mid-infrared laser pulse. It was observed that the two-photon emission persists even when the trigger pulse is injected long after the excitation. This is due to the long decoherence time of the vibrational states of solid parahydrogen. It is found that the emission intensity increases even after the excitation pulses pass through the target completely. This coherence development is highly suppressed at high target temperatures and high residual orthohydrogen concentrations. Effects of target annealing and laser-induced damage on the target are also observed.

DOI： 10.1021/acs.jpca.7b02011

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High-precision quadrupole moment reveals significant intruder component in Al-33(13)20 ground state

H. Heylen, M. De Rydt, G. Neyens, M. L. Bissell, L. Caceres, R. Chevrier, J. M. Daugas, Y. Ichikawa, Y. Ishibashi, O. Kamalou, T. J. Mertzimekis, P. Morel, J. Papuga, A. Poves, M. M. Rajabali, C. Stodel, J. C. Thomas, H. Ueno, Y. Utsuno, N. Yoshida, A. Yoshimi

PHYSICAL REVIEW C 94 ( 3 ) 2016.9

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

The electric quadrupole moment of the Al-33(13)20 ground state, located at the border of the island of inversion, was obtained using continuous-beam beta-detected nuclear quadrupole resonance (beta-NQR). From the measured quadrupole coupling constant nu(Q) = 2.31(4) MHz in an alpha-Al2O3 crystal, a precise value for the electric quadrupole moment is extracted: vertical bar Q(s) (Al-33)vertical bar = 141(3) mb. A comparison with large-scale shell model calculations shows that Al-33 has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N = 20 shell gap. Al-33 therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z >= 14 isotopes.

DOI： 10.1103/PhysRevC.94.034312

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Frequency characteristics of nuclear spin oscillator with an artificial feedback toward search for 129Xe atomic electric dipole moment Reviewed

Takeshi Inoue, Takeshi Furukawa, Akihiro Yoshimi, Tsubasa Nanao, Masatoshi Chikamori, Kunifumi Suzuki, Hironori Hayashi, Hirokazu Miyatake, Yuichi Ichikawa, Masato Tsuchiya, Naoto Hatakeyama, Sota Kagami, Makoto Uchida, Hideki Ueno, Yukari Matsuo, Takeshi Fukuyama, Koichiro Asahi

The European Physical Journal D 70 ( 6 ) 129 2016.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media {LLC}

DOI： 10.1140/epjd/e2016-70034-8

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Simultaneous Measurements of Superradiance at Multiple Wavelength from Helium Excited States: II. Analysis Reviewed

Ohae Chiaki, Harries James R, Iwayama Hiroshi, Kawaguchi Kentarou, Kuma Susumu, Miyamoto Yuki, Nagasono Mitsuru, Nakajima Kyo, Nakano Itsuo, Shigemasa Eiji, Sasao Noboru, Uetake Satoshi, Wakabayashi Tomonari, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 85 ( 3 ) 2016.3

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Language：English Publishing type：Research paper (scientific journal) Publisher：PHYSICAL SOC JAPAN

Previous experimental studies of superradiance (SR) in multi-level systems have been explainable using the predictions of the well-known simple two-level SR model. However our recent study [K. Nakajima et al., J. Phys. Soc. Jpn. 84, 054301 (2015)] using EUV free-electron laser excitation of helium atoms, where SR was observed at wavelengths of 502, 668, and 728 nm, revealed behaviour which necessitates a full multi-level treatment of the SR development. In this paper, we report simulations of the initial excitation by the FEL pulses, and the subsequent development of multi-level SR. The results of the simulation reproduce the experimental findings, and reveal that competitive SR on two transitions with a common upper level plays an important role in the development of the system.

DOI： 10.7566/JPSJ.85.034301

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20pAX-6 Measurement of nuclear magnetic moment of neutron-rich ^<39>S

Ishibashi Y., Ichikawa Y., Takamine A., Imamura K., Fujita T., Sato T., Asahi K., Egami T., Funayama C., Kawaguchi T., Kojima S., Nishizaka T., Ohtomo Y., Ozawa A., Tominaga D., Yamazaki H., Yoshimi A., Ueno H.

Meeting Abstracts of the Physical Society of Japan 71 332 - 332 2016

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.71.1.0_332

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Recent progress of SPAN towards neutrino mass spectroscopy Reviewed

Masuda T, Hara H, Miyamoto Y, Sasao N, Tanaka M, Uetake S, Yoshimi A, Yoshimura K, Yoshimura M

Journal of Physics: Conference Series 718 ( 6 ) 2016

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：IOP PUBLISHING LTD

SPAN (SPectroscopy of Atomic Neutrino) project aims to determine the absolute neutrino mass. The process we plan to use is a cooperative de-excitation of atoms in a metastable level emitting a neutrino pair associated with a photon. The photon energy spectrum of this process contains information on the absolute mass of neutrino. Key items of this experiment are a rate amplification using macro-coherence in a target medium in case of plural particles emission and an external triggering of the emission in order to scan the spectrum. We have demonstrated the rate amplification in two-photon emission from para-hydrogen gas which was coherently excited to its first vibrationally excited state. The coherence in the medium was generated by irradiating two driving laser pulses. The emission was stimulated by irradiating a mid-infrared laser pulse. The enhancement factor of more than 10(18) with respect to the spontaneous emission was achieved. This paper briefly summarizes the results.

DOI： 10.1088/1742-6596/718/6/062043

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Other Link： http://orcid.org/0000-0001-8122-5145
Observation of vibrational coherent two-photon emission in solid parahydrogen

Miyamoto Yuki, Hara Hideaki, Masuda Takahiko, Uetake Satoshi, Sasao Noboru, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

Meeting Abstracts of the Physical Society of Japan 71 577 - 577 2016

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.71.2.0_577

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22aAX-11 Frequency characteristic of ^<129>Xe/^<131>Xe dual nuclear spin maser

Kojima S., Sato T., Ichikawa Y., Tanaka S., Funayama C., Sakamoto Y., Ohtomo Y., Hirao C., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 71 436 - 436 2016

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.71.1.0_436

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22aAX-10 Spin polarization and relaxation mechanism in a cell with multi nuclear species

Funayama C., Sato T., Ichikawa Y., Kojima S., Tanaka S., Sakamoto Y., Ohtomo Y., Hirao C., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 71 435 - 435 2016

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DOI： 10.11316/jpsgaiyo.71.1.0_435

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22aAX-12 EDM experiment using dual-species nuclear spin maser

Sato T., Ichikawa Y., Kojima S., Funayama C., Tanaka S., Sakamoto Y., Ohtomo Y., Hirao C., Chikamori M., Hikota E., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 71 437 - 437 2016

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DOI： 10.11316/jpsgaiyo.71.1.0_437

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22aAX-4 Study of a rubidium magnetometer for the electron EDM search using francium atoms

Uchiyama A., Inoue T., Aoki T., Ito S., Kato K., Kawamura H., Sakamoto K., Hayamizu T., Harada K., Aoki T., Asahi K., Yoshimi A., Sakemi Y.

Meeting Abstracts of the Physical Society of Japan 71 433 - 433 2016

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DOI： 10.11316/jpsgaiyo.71.1.0_433

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Performance assessment of a new laser system for efficient spin exchange optical pumping in a spin maser measurement of 129Xe EDM

C. Funayama, T. Furukawa, T. Sato, Y. Ichikawa, Y. Ohtomo, Y. Sakamoto, S. Kojima, T. Suzuki, C. Hirao, M. Chikamori, E. Hikota, M. Tsuchiya, A. Yoshimi, C. P. Bidinosti, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama, K. Asahi

Hyperfine Interactions 236 ( 1-3 ) 59 - 64 2015.11

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DOI： 10.1007/s10751-015-1203-3

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Experimental search for the electron electric dipole moment with laser cooled francium atoms

T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, H. Kawamura, A. Uchiyama, T. Aoki, K. Asahi, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H. P. Yoshida, A. Yoshimi, Y. Sakemi

Hyperfine Interactions 231 ( 1-3 ) 157 - 162 2015.4

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DOI： 10.1007/s10751-014-1100-1

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EDM measurement in 129Xe atom using dual active feedback nuclear spin maser

T. Sato, Y. Ichikawa, Y. Ohtomo, Y. Sakamoto, S. Kojima, C. Funayama, T. Suzuki, M. Chikamori, E. Hikota, M. Tsuchiya, T. Furukawa, A. Yoshimi, C. P. Bidinosti, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama, K. Asahi

Hyperfine Interactions 230 ( 1-3 ) 147 - 153 2015.4

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DOI： 10.1007/s10751-014-1113-9

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26aSF-5 Development for the technique of the EDM search with cooled Fr atoms

Sakemi Y., Aoki T., Harada K., Hayamizu T., Inoue T., Itoh M., Ito S., Kato K., Kawamura H., Sakamoto K., Uchiyama A., Hisano J., Aoki T., Hatakeyama A., Hatanaka K., Wakasa T., Takahashi Y., Asahi K., Yoshimi A.

Meeting Abstracts of the Physical Society of Japan 70 251 - 251 2015

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DOI： 10.11316/jpsgaiyo.70.2.0_251

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Externally triggered coherent two-photon emission from hydrogen molecules Reviewed

Miyamoto Y, Hara H, Masuda T, Sasao N, Tanaka M, Uetake S, Yoshimi A, Yoshimura K, Yoshimura M

Progress of Theoretical and Experimental Physics 2015 ( 8 ) 2015

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We report on coherent enhancement of two-photon emission from the excited vibrational state of molecular hydrogen triggered by irradiating mid-infrared pulses externally. We previously observed the two-photon emission triggered by the internally generated fourth Stokes photons. By injecting independent mid-infrared pulses externally, it is possible to control the experimental parameters and investigate the mechanism in more detail. In this article, we describe the two-photon emission using the external trigger pulses. Its spectrum and dependence on the energy and timing of the trigger pulse are presented along with numerical simulations based on the Maxwell-Bloch equations. The measured number of emitted photons is 6 x 10(11) photons/pulse and the resulting enhancement factor from the spontaneous emission is more than 10(18). This value is three orders of magnitude higher than that of the previous experiment. External control of the emission process is expected to be essential for observation of the weaker process of radiative emission of a neutrino pair.

DOI： 10.1093/ptep/ptv103

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Rate amplification of the two photon emission from para-hydrogen toward the neutrino mass measurement Reviewed

Masuda T, Hara H, Miyamoto Y, Kuma S, Nakano I, Ohae C, Sasao N, Tanaka M, Uetake S, Yoshimi A, Yoshimura K, Yoshimura M

Hyperfine Interactions 236 ( 1-3 ) 73 - 77 2015

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We recently reported an experiment which focused on demonstrating the macro-coherent amplification mechanism. This mechanism, which was proposed for neutrino mass measurements, indicates that a multi-particle emission rate should be amplified by coherence in a suitable medium. Using a para-hydrogen molecule gas target and the adiabatic Raman excitation method, we observed that the two photon emission rate was amplified by a factor of more than 10(15) from the spontaneous emission rate. This paper briefly summarizes the previous experimental result and presents the current status and the future prospect.

DOI： 10.1007/s10751-015-1177-1

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Development of high-homogeneity magnetic field coil for 129Xe EDM experiment Reviewed

Y. Sakamoto, C. P. Bidinosti, Y. Ichikawa, T. Sato, Y. Ohtomo, S. Kojima, C. Funayama, T. Suzuki, M. Tsuchiya, T. Furukawa, A. Yoshimi, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama, K. Asahi

Hyp. Int. 230 ( 1-3 ) 141 - 146 2015

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DOI： 10.1007/s10751-014-1109-5

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Spin-aligned RI beams and g-factor measurements Reviewed

Y. Ichikawa, H. Ueno, Y. Ishii, T. Furukawa, A. Yoshimi, D. Kameda, H. Watanabe, N. Aoi, K. Asahi, D. L. Bakabanski, R. Chevrier, J.M. Daugas, N. Fukuda, G. Georgiev, H Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, T. Kubo, T. Nanao, T. Ohnishi, M. M. Rajabali, K. Suzuki, H. Takeda, M Tsuchiya

JPS Conf. Proc. 6 030004 2015

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DOI： 10.7566/JPSCP.6.030004

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Double-cell Geometry For 129Xe/3He Co-magnetometry Reviewed

Yuichi OHTOMO, Yuichi ICHIKAWA, Tomoya SATO, Yu SAKAMOTO, Shuichiro KOJIMA, Takahiro SUZUKI, Hazuki SHIRAI, Masatoshi CHIKAMORI, Eri HIKOTA, Hirokazu MIYATAKE, Tsubasa NANAO, Kunifumi SUZUKI, Masato TSUCHIYA, Takeshi INOUE, Takeshi FURUKAWA, Akihiro YOSHIMI, Christopher P. BIDINOSTI, Takashi INO, Hideki UENO, Yukari MATSUO, Takeshi FUKUYAMA, Koichiro ASAHI

JPS Conf. Proc. 6 030067 - 030067 2015

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DOI： 10.7566/JPSCP.6.030067

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129Xe EDM Search Experiment Using Active Nuclear Spin Maser Reviewed

Tomoya SATO, Yuichi ICHIKAWA, Yuichi OHTOMO, Yu SAKAMOTO, Shuichiro KOJIMA, Takahiro SUZUKI, Hazuki SHIRAI, Masatoshi CHIKAMORI, Eri HIKOTA, Hirokazu MIYATAKE, Tsubasa NANAO, Kunifumi SUZUKI, Masato TSUCHIYA, Takeshi INOUE, Takeshi FURUKAWA, Akihiro YOSHIMI, Christopher P. BIDINOSTI, Takashi INO, Hideki UENO, Yukari MATSUO, Takeshi FUKUYAMA, Koichiro ASAHI

JPS Conf. Proc. 6 020031 2015

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DOI： 10.7566/JPSCP.6.020031

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Two Pion versus σ-Meson Exchange Potentials

Sachiko Oshima, Takehisa Fujita, Naohiro K, a, Akihiro Yoshimi

Journal of Modern Physics 06 ( 07 ) 927 - 936 2015

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DOI： 10.4236/jmp.2015.67097

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21aCE-1 Development of a pumping laser system for concurrent maser oscillation of ^<129>Xe/^3He atoms

Funayama C., Furukawa T., Sato T., Ichikawa Y., Ohtomo Y., Sakamoto Y., Kojima S., Hirao C., Kanno Y., Komine T., Suzuki T., Chikamori M., Hikota E., Tsuchiya M., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 70 244 - 244 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_244

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21aCE-3 Performance of 129Xe/3He nuclear spin masers with double-cell geometry

Kojima S., Sato T., Ichikawa Y., Ohtomo Y., Sakamoto Y., Funayama C., Hirao C., Kanno Y., Komine T., Suzuki T., Chikamori M., Hikota E., Tsuchiya M., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 70 246 - 246 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_246

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21aCE-4 Experimental search for EDM in ^<129>Xe atom using ^3He comagnetometer IV

Sato T., Ichikawa Y., Ohtomo Y., Sakamoto Y., Kojima S., Funayama C., Hirao C., Kanno Y., Komine T., Suzuki T., Chikamori M., Hikota E., Tsuchiya M., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 70 247 - 247 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_247

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22pAG-7 Coherent two-photon emission from the vibrational excited states of hydrogen molecules III

Uetake Satoshi, Hara Hideaki, Masuda Takahiko, Miyamoto Yuki, Nakano Itsuo, Sasao Noboru, Tanaka Minoru, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

Meeting Abstracts of the Physical Society of Japan 70 668 - 668 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_668

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22aDF-11 Detailed study on the macro-coherent amplification mechanism for the SPAN (SPectroscopy with Atomic Neutrino) experiment II

Hara Hideaki, Masuda Takahiko, Miyamoto Yuki, Nakano Itsuo, Sasao Noboru, Tanaka Minoru, Uetake Satoshi, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

Meeting Abstracts of the Physical Society of Japan 70 86 - 86 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_86

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21aCE-2 Operation of ^<129>Xe/^3He dual spin masers under homogeneous magnetic field

Sakamoto Y., Bidinosti C. P., Ichikawa Y., Sato T., Ohtomo Y., Kojima S., Funayama C., Suzuki T., Hirao C., Kanno Y., Komine T., Tsuchiya M., Furukawa T., Yoshimi A., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 70 245 - 245 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_245

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21aCE-6 Development of a rubidium magnetometer for the electron EDM search using francium atoms

Uchiyama A., Inoue T., Aoki T., Arikawa H., Ando S., Ishikawa T., Itoh M., Kato K., Kawamura H., Sakamoto K., Hayamizu T., Harada K., Aoki T., Asahi K., Yoshimi A., Sakemi Y.

Meeting Abstracts of the Physical Society of Japan 70 249 - 249 2015

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DOI： 10.11316/jpsgaiyo.70.1.0_249

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26aSF-6 Uncertainties in precision frequency measurement using ^<129>Xe/^3He dual spin masers

Sato T., Ichikawa Y., Kojima S., Funayama C., Sakamoto Y., Ohtomo Y., Hirao C., Chikamori M., Hikota E., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting Abstracts of the Physical Society of Japan 70 252 - 252 2015

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DOI： 10.11316/jpsgaiyo.70.2.0_252

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Development of magnetometer based on the Nonlinear Magneto-Optical Rotation effect toward the measurement of the electron electric dipole moment Reviewed

T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, H. Kawamura, A. Uchiyama, K. Asahi, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H.S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, A. Yoshimi, H.P. Yoshida, Y. Sakemi

JPS Conf. Proc. 6 030070 2015

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DOI： 10.7566/JPSCP.6.030070

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Production of Ba Metastable State via Superradiance Reviewed

Ohae Chiaki, Fukumi Atsushi, Kuma Susumu, Miyamoto Yuki, Nakajima Kyo, Nakano Itsuo, Nanjo Hajime, Sasao Noboru, Uetake Satoshi, Wakabayashi Tomonari, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 83 ( 4 ) 2014.4

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We describe in this paper a fast and efficient method of producing a high density of barium (Ba) atoms in the D-1(2) metastable state, which is a candidate initial state for a new class of cooperative and coherent optical process called paired superradiance (PSR). In the experiment, Ba atoms are excited first by laser light to the P-1(1) state and then brought to the desired state D-1(2) via radiative transition in the superradiance (SR) mode. It is found that a production efficiency (from S-1(0) to D-1(2)) of more than similar to 30% is achieved within a time interval of a few nanoseconds for a Ba density n > 10(19) m(-3). Several key features of SR important for future PSR experiments are also studied.

DOI： 10.7566/JPSJ.83.044301

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Search for electric dipole moment in Xe-129 atom using a nuclear spin oscillator Reviewed

K. Asahi, Y. Ichikawa, M. Chikamori, Y. Ohtomo, E. Hikota, T. Suzuki, T. Inoue, T. Furukawa, A. Yoshimi, K. Suzuki, T. Nanao, H. Miyatake, M. Tsuchiya, N. Yoshida, H. Shirai, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama

PHYSICS OF PARTICLES AND NUCLEI 45 ( 1 ) 199 - 201 2014.1

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We aim to measure the electric dipole moment (EDM) of a diamagnetic atom Xe-129 using an optical-detection nuclear spin maser technique. The relation of EDM in a diamagnetic atom to nuclear Schiff moment and fundamental sources generating it is discussed, and the present status for the development of our experimental setup is presented.

DOI： 10.1134/S1063779614010080

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Search for electric dipole moment in Xe-129 atom using active nuclear spin maser Reviewed

Y. Ichikawa, M. Chikamori, Y. Ohtomo, E. Hikota, Y. Sakamoto, T. Suzuki, C. P. Bidinosti, T. Inoue, T. Furukawa, A. Yoshimi, K. Suzuki, T. Nanao, H. Miyatake, M. Tsuchiya, N. Yoshida, H. Shirai, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama, K. Asahi

INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 2 66 05007 2014

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An experimental search for an electric dipole moment in the diamagnetic atom Xe-129 is in progress through the precision measurement of spin precession frequency using an active nuclear spin maser. A He-3 comagnetometer has been incorporated into the active spin maser system in order to cancel out the long-term drifts in the external magnetic field. Also, a double-cell geometry has been adopted in order to suppress the frequency shifts due to interaction with polarized Rb atoms. The first EDM measurement with the Xe-129 active spin maser and the He-3 comagnetometer has been conducted.

DOI： 10.1051/epjconf/20146605007

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Observation of coherent two-photon emission from the first vibrationally excited state of hydrogen molecules Reviewed

Miyamoto Y, Hara H, Kuma S, Masuda T, Nakano I, Ohae C, Sasao N, Tanaka M, Uetake S, Yoshimi A, Yoshimura K, Yoshimura M

Progress of Theoretical and Experimental Physics 2014 ( 11 ) 2014

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In this paper, we describe an experiment which was conducted to explore the macro-coherent amplification mechanism using a two-photon emission process from the first vibrationally excited state of the para-hydrogen molecule. Large coherence in the initial state was prepared by the adiabatic Raman method, and the lowest Stokes sideband was used as a trigger field. We observed coherent two-photon emission consistent with the expectation of the Maxwell-Bloch equation derived for the process, whose rate is larger by many orders of magnitude than that of spontaneous emission.

DOI： 10.1093/ptep/ptu152

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Active nuclear spin maser oscillation with double cell Reviewed

E. Hikota, M. Chikamori, Y. Ichikawa, Y. Ohtomo, Y. Sakamoto, T. Suzuki, C. P. Bidinosti, T. Inoue, T. Furukawa, A. Yoshimi, K. Suzuki, T. Nanao, H. Miyatake, M. Tsuchiya, N. Yoshida, H. Shirai, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyama, K. Asahi

INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 2 66 05005 2014

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Uncertainty in the frequency precision of the planned experiment to search for a Xe-129 atomic electric dipole moment is dominated by drifts in the frequency shift due to contact interaction of Xe-129 with polarized Rb valence electrons. In order to suppress the frequency shift, a double-cell geometry has been adopted for the confinement of Xe-129 gas. A new process has been identified to take part in the optical detection of spin precession. The parameters controlling the oscillation of the maser in this new double-cell arrangement were optimized As a result, the frequency shift has been reduced by a factor of 10 or more from the former single-cell geometry.

DOI： 10.1051/epjconf/20146605005

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Spin-aligned RI beams via two-step fragmentation reactions Reviewed

Y. Ichikawa, H. Ueno, Y. Ishii, T. Furukawa, A. Yoshimi, D. Kameda, H. Watanabe, N. Aoi, K. Asahi, D. L. Balabanski, R. Chevrier, J. M. Daugas, N. Fukuda, G. Georgiev, H. Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, T. Kubo, T. Nanao, T. Ohnishi, K. Suzuki, M. Tsuchiya, H. Takeda, M. M. Rajabali

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 317 769 - 773 2013.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

A method to produce spin-aligned rare isotope (RI) beams has been developed, where a scheme of two-step projectile fragmentation to produce the RI of interest with high spin alignment and a technique of momentum-dispersion matching are combined. Effectiveness of the present method was demonstrated in an experiment at the RIKEN RIBF, where an RI beam of Al-32 with spin alignment of 8(1)% was successfully produced from a primary beam of Ca-48, via an intermediate RI of Al-33. Figure of merit of the present method was found to be more than 50 times greater than that of the conventional method employing single-step projectile fragmentation. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2013.04.071

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Development of a new device control system for β-NMR experiments

N. Yoshida, H. Ueno, A. Yoshimi, Y. Ishibashi, Y. Ichikawa, Y. Abe, K. Asahi, M. Chikamori, T. Fujita, T. Furukawa, E. Hikota, D. Nagae, Y. Ohtomo, Y. Saito, H. Shirai, T. Suzuki, X.F. Yang

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 317 705 - 709 2013.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.nimb.2013.08.057

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Development of an adiabatic field rotation system to measure spin polarization of unstable nuclei

Y. Ishibashi, N. Yoshida, H. Ueno, A. Yoshimi, Y. Ichikawa, Y. Abe, K. Asahi, M. Chikamori, T. Fujita, T. Furukawa, E. Hikota, D. Nagae, Y. Ohtomo, Y. Saito, H. Shirai, T. Suzuki, X.F. Yang, N. Sakamoto

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 317 714 - 716 2013.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.nimb.2013.08.059

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Coherence decay measurement of v=2 vibrons in solid parahydrogen Reviewed

Susumu Kuma, Yuki Miyamoto, Kyo Nakajima, Atsushi Fukumi, Kentarou Kawaguchi, Itsuo Nakano, Noboru Sasao, Minoru Tanaka, Jian Tang, Takashi Taniguchi, Satoshi Uetake, Tomonari Wakabayashi, Akihiro Yoshimi, Motohiko Yoshimura

JOURNAL OF CHEMICAL PHYSICS 138 ( 2 ) 024507 2013.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS

The coherence decay of the v = 2 vibrational state (vibrons) of solid parahydrogen was measured via time-resolved coherent anti-Stokes Raman spectroscopy. We found that the decay curve has a non-exponential time profile in the time scale of 200 ns at a low temperature below 5 K and a low orthohydrogen impurity concentration (similar to 0.01%). This behavior, as also observed in the case of the v = 1 vibrons, represents a signature of band structure of the v = 2 state in the solid phase. The maximum coherence decay time of 50 ns in an exponential part was achieved, which shows excellence of the v = 2 state for coherent processes. We also found that finite temperatures, orthohydrogen impurities, and other structural inhomogeneity accelerate the decay, hiding the non-exponential feature of the vibron band. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773893]

DOI： 10.1063/1.4773893

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Nuclear moments of mu-second isomeric fragments at BigRIPS Reviewed

R. Chevrier, J. M. Daugas, L. Gaudefroy, M. Hass, H. Haas, H. Ueno, N. Aoi, N. Fukuda, Y. Ichikawa, N. Inabe, M. Ishihara, D. Kameda, T. Kubo, T. Ohnishi, H. Takeda, H. Watanabe, A. Yoshimi, K. Asahi, T. Furukawa, H. Hayashi, H. Iijima, T. Inoue, Y. Ishii, T. Nanao, K. Suzuki, M. Tsuchiya, D. L. Balabanski, G. Georgiev, S. Cootenier, G. Neyens, M. Rajabali

FRENCH-JAPANESE SYMPOSIUM ON NUCLEAR STRUCTURE PROBLEMS: ORGANIZED IN THE FRAMEWORK OF FJNSP LIA AND EFES 33 - 39 2013

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The measurement of nuclear moments of a mu-second isomeric state have been successfully performed using the RIKEN Radioactive Ion Beam Facility. The Time Dependent Perturbed Angular Distribution technique was applied on the 43 S isomeric state produced by the fragmentation of a Ca-48 beam and selected with the BigRIPS spectrometer. Following the measurement of the known g-factor of the isomer the quadrupole moment of this state was measured. Its spectroscopic quadrupole moment vertical bar Q(S)vertical bar = 23( 3) efm(2) agreed with both shell model and beyond mean field calculations.

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Production of spin-aligned RI beams via the two-step fragmentation reaction Reviewed

H. Ueno, Y. Ichikawa, Y. Ishii, T. Furukawa, A. Yoshimi, D. Kameda, H. Watanabe, N. Aoi, K. Asahi, D. L. Balabanski, R. Chevrier, J. M. Daugas, N. Fukuda, G. Georgiev, H. Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, T. Kubo, T. Nanao, T. Ohnishi, K. Suzuki, M. Tsuchiya, H. Takeda, M. M. Rajabali

FRENCH-JAPANESE SYMPOSIUM ON NUCLEAR STRUCTURE PROBLEMS: ORGANIZED IN THE FRAMEWORK OF FJNSP LIA AND EFES 40 - 45 2013

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Based on the technique of fragmentation-induced spin polarization combined with the beta-NMR method, we have conducted a series of ground-state nuclear-moment measurements in a region of light neutron-rich nuclei at RIKEN. The research has recently been extended also at GANIL. The ground-state studies will be further enhanced by the upgrade of RIPS proposed in the RIBF Phase-II program. Also, utilizing the technique of fragmentation-induced spin-orientation, nuclear-moment measurements of isomeric state were conducted. Remarkably, we have recently developed a method to produce highly spin-aligned RI beams in a new promising scheme. The method was first examined using BigRIPS, where a highly spin-aligned isomeric Al-32m beam was successfully produced through the two-step projectile fragmentation reaction.

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Nuclear spin maser and experimental search for Xe-129 atomic EDM Reviewed

T. Inoue, T. Furukawa, A. Yoshimi, Y. Ichikawa, M. Chikamori, Y. Ohtomo, M. Tsuchiya, N. Yoshida, H. Shirai, M. Uchida, K. Suzuki, T. Nanao, H. Miyatake, H. Ueno, Y. Matsuo, T. Fukuyama, K. Asahi

Hyp. Int. 220 59 - 63 2013

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Novel method for the production of spin-aligned RI beams in projectile fragmentation reaction with the dispersion matching technique Reviewed

Y. Ichikawa, H. Ueno, Y. Ishii, T. Furukawa, A. Yoshimi, D. Kameda, H. Watanabe, N. Aoi, K. Asahi, D. L. Balabanski, R. Chevrier, J. M. Daugas, N. Fukuda, G. Georgiev, H. Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, T. Kubo, T. Nanao, T. Ohnishi, K. Suzuki, M. Tsuchiya, H. Takeda, M. M. Rajabali

Hyperfine. Interact. 220 47 - 51 2013

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DOI： 10.1007/s10751-012-0682-8

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Production of spin-controlled rare isotope beams Reviewed

Yuichi Ichikawa, Hideki Ueno, Yuji Ishii, Takeshi Furukawa, Akihiro Yoshimi, Daisuke Kameda, Hiroshi Watanabe, Nori Aoi, Koichiro Asahi, Dimiter L. Balabanski, Raphael Chevrier, Jean-Michel Daugas, Naoki Fukuda, Georgi Georgiev, Hironori Hayashi, Hiroaki Iijima, Naoto Inabe, Takeshi Inoue, Masayasu Ishihara, Toshiyuki Kubo, Tsubasa Nanao, Tetsuya Ohnishi, Kunifumi Suzuki, Masato Tsuchiya, Hiroyuki Takeda, Mustafa M. Rajabali

NATURE PHYSICS 8 ( 12 ) 918 - 922 2012.12

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The degree of freedom of spin in quantum systems serves as an unparalleled laboratory where intriguing quantum physical properties can be observed, and the ability to control spin is a powerful tool in physics research. We propose a method for controlling spin in a system of rare isotopes which takes advantage of the mechanism of the projectile fragmentation reaction combined with the momentum-dispersion matching technique. The present method was verified in an experiment at the RIKEN RI Beam Factory, in which a degree of alignment of 8% was achieved for the spin of a rare isotope Al-32. The figure of merit for the present method was found to be greater than that of the conventional method by a factor of more than 50.

DOI： 10.1038/NPHYS2457

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Observation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon U-238 Reviewed

D. Kameda, T. Kubo, T. Ohnishi, K. Kusaka, A. Yoshida, K. Yoshida, M. Ohtake, N. Fukuda, H. Takeda, K. Tanaka, N. Inabe, Y. Yanagisawa, Y. Gono, H. Watanabe, H. Otsu, H. Baba, T. Ichihara, Y. Yamaguchi, M. Takechi, S. Nishimura, H. Ueno, A. Yoshimi, H. Sakurai, T. Motobayashi, T. Nakao, Y. Mizoi, M. Matsushita, K. Ieki, N. Kobayashi, K. Tanaka, Y. Kawada, N. Tanaka, S. Deguchi, Y. Satou, Y. Kondo, T. Nakamura, K. Yoshinaga, C. Ishii, H. Yoshii, Y. Miyashita, N. Uematsu, Y. Shiraki, T. Sumikama, J. Chiba, E. Ideguchi, A. Saito, T. Yamaguchi, I. Hachiuma, T. Suzuki, T. Moriguchi, A. Ozawa, T. Ohtsubo, M. A. Famiano, H. Geissel, A. S. Nettleton, O. B. Tarasov, D. Bazin, B. M. Sherrill, S. L. Manikonda, J. A. Nolen

PHYSICAL REVIEW C 86 ( 5 ) 054319 2012.11

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A search for isomeric gamma decays among fission fragments from 345 MeV/nucleon U-238 has been performed at the RIKEN Nishina Center RI Beam Factory. Fission fragments were selected and identified using the superconducting in-flight separator BigRIPS and were implanted in an aluminum stopper. Delayed gamma rays were detected using three clover-type high-purity germanium detectors located at the focal plane within a time window of 20 mu s following the implantation. We identified a total of 54 microsecond isomers with half-lives of similar to 0.1-10 mu s, including the discovery of 18 new isomers in very neutron-rich nuclei: Ti-59(m), As-90(m), Se-92(m), Se-93(m), Br-94(m), Br-95(m), Br-96(m), Rb-97(m), Nb-108(m), Mo-109(m), Ru-117(m), Ru-119(m), Rh-120(m), Rh-122(m), Pd-121(m), Pd-124(m), Ag-124(m), and Ag-126(m), and obtained a wealth of spectroscopic information such as half-lives, gamma-ray energies, gamma-ray relative intensities, and gamma gamma coincidences over a wide range of neutron-rich exotic nuclei. Proposed level schemes are presented for Ti-59(m), Ga-82(m), Br-92(m), Br-94(m), Br-95(m), Rb-97(m), Rb-98(m), Nb-108(m), Zr-108(m), Mo-109(m), Ru-117(m), Ru-119(m), Rh-120(m), Rh-122(m), Pd-121(m), Ag-124(m), and Ag-125(m), based on the obtained spectroscopic information and the systematics in neighboring nuclei. The nature of the nuclear isomerism is discussed in relation to the evolution of nuclear structure.

DOI： 10.1103/PhysRevC.86.054319

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Erosion of N=20 shell in Al-33 investigated through the ground-state electric quadrupole moment Reviewed

K. Shimada, H. Ueno, G. Neyens, K. Asahi, D. L. Balabanski, J. M. Daugas, M. Depuydt, M. De Rydt, L. Gaudefroy, S. Grevy, Y. Hasama, Y. Ichikawa, D. Kameda, P. Morel, T. Nagatomo, L. Perrot, Ch Stodel, J. -C. Thomas, Y. Utsuno, W. Vanderheijden, N. Vermeulen, P. Vingerhoets, E. Yagi, K. Yoshida, A. Yoshimi

PHYSICS LETTERS B 714 ( 2-5 ) 246 - 250 2012.8

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Electric quadrupole moment Q of the Al-33 ground state has been measured by means of beta-NMR spectroscopy using a spin-polarized Al-33 beam produced in a projectile fragmentation reaction. The obtained Q moment, vertical bar Q(exp)(Al-33)vertical bar = 132(16) emb, shows a significant excess from the prediction of shell model calculations within the sd shell. The result indicates sizable admixing of pf intruder configurations in the ground state, demonstrating that the N = 20 shell closure certainly erodes in Al-33, a nucleus located on the border of the island of inversion. Comparison was made with predictions of the Monte Carlo shell model, and also a particle-vibration coupling model treating the neutron pairing correlations in the ground state of Al-33. Again, a significant admixture of pf intruder configurations to the Al-33 ground state was needed in both theoretical approaches to explain the observed large Q. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2012.07.030

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Low-frequency Xe-129 nuclear spin oscillator with optical spin detection Reviewed

A. Yoshimi, T. Inoue, T. Furukawa, T. Nanao, K. Suzuki, M. Chikamori, M. Tsuchiya, H. Hayashi, M. Uchida, N. Hatakeyama, S. Kagami, Y. Ichikawa, H. Miyatake, K. Asahi

PHYSICS LETTERS A 376 ( 24-25 ) 1924 - 1929 2012.5

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We have constructed a Xe-129 nuclear spin oscillator which executes a self-sustained oscillation through an external feedback loop with optical detection of nuclear spin. The oscillator is capable of operating at frequencies much lower than the conventional nuclear spin maser. A method for efficient optical detection of spin has been developed and applied to the nuclear spin oscillator, and the frequency characteristics of the oscillator at low frequencies has been investigated. The spin oscillator was operated at frequencies 2.5-36 Hz. The frequency performance of the oscillator is discussed in relation to a planned search for an atomic electric dipole moment taking advantage of the present oscillator scheme. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physleta.2012.04.043

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Is the 7/2(1)(-) Isomer State of S-43 Spherical? Reviewed

R. Chevrier, J. M. Daugas, L. Gaudefroy, Y. Ichikawa, H. Ueno, M. Hass, H. Haas, S. Cottenier, N. Aoi, K. Asahi, D. L. Balabanski, N. Fukuda, T. Furukawa, G. Georgiev, H. Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, Y. Ishii, D. Kameda, T. Kubo, T. Nanao, G. Neyens, T. Ohnishi, M. M. Rajabali, K. Suzuki, H. Takeda, M. Tsuchiya, N. Vermeulen, H. Watanabe, A. Yoshimi

PHYSICAL REVIEW LETTERS 108 ( 16 ) 162501 2012.4

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We report on the spectroscopic quadrupole moment measurement of the 7/2(1)(-) isomeric state in S-43(16)27 [E* = 320.5(5) keV, T-1/2 = 415(3) ns], using the time dependent perturbed angular distribution technique at the RIKEN RIBF facility. Our value, vertical bar Q(s) vertical bar = 23(3) efm(2), is larger than that expected for a single-particle state. Shell model calculations using the modern SDPF-U interaction for this mass region reproduce remarkably well the measured vertical bar Q(s) vertical bar, and show that non-negligible correlations drive the isomeric state away from a purely spherical shape.

DOI： 10.1103/PhysRevLett.108.162501

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Isobaric analog resonances of the N=21 nucleus 35Si Reviewed

N. Imai, Y. Hirayama, Y. X. Watanabe, T. Teranishi, T. Hashimoto, S. Hayakawa, Y. Ichikawa, H. Ishiyama, S. C. Jeong, D. Kahl, S. Kubono, H. Miyatake, H. Ueno, H. Yamaguchi, K. Yoneda, A. Yoshimi

Physical Review C 85 ( 3 ) 2012.3

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevc.85.034313

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Other Link： http://orcid.org/0000-0001-8864-369X
Fe-57 charge states in MC-Si solar cells under light illumination after GeV-implantation of Mn-57 Reviewed

Yutaka Yoshida, Kunifumi Suzuki, Yoshio Kobayashi, Takashi Nagatomo, Yuki Akiyama, Kenichi Yukihira, Kazuo Hayakawa, Hideki Ueno, Akihiro Yoshimi, Daisuke Nagae, Koichiro Asahi, Guido Langouche

HYPERFINE INTERACTIONS 204 ( 1-3 ) 133 - 137 2012.3

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Immediately after the GeV-implantation of Mn-57 nuclei produced by the RIKEN-RIBF facility, Mn-57/Fe-57 Mossbauer spectra in Si-solar cells are measured under light illumination. Comparing with the spectrum of p-type multi-crystalline-Si, the broad spectra of the solar cell under operation can be analyzed as a superposition of interstitial and substitutional Fe components with different charge states. The charge states of Fe impurities are created by the excess carrier injection followed by a directional carrier flow in the p-n junction. The present results provide us a possibility to clarify the carrier trapping process at the Fe impurities in Si-solar cells.

DOI： 10.1007/s10751-011-0424-3

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Neutrino spectroscopy with atoms and molecules Invited Reviewed

Atsushi Fukumi, Susumu Kuma, Yuki Miyamoto, Kyo Nakajima, Itsuo Nakano, Hajime Nanjo, Chiaki Ohae, Noboru Sasao, Minoru Tanaka, Takashi Taniguchi, Satoshi Uetake, Tomonari Wakabayashi, Takuya Yamaguchi, Akihiro Yoshimi, Motohiko Yoshimura

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2012 ( 1 ) 04D002 2012

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Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS INC

We systematically investigate the new experimental method of using atoms or molecules to measure the important parameters of neutrinos that are still to be determined: the absolute mass scale, the mass hierarchy pattern (normal or inverted), the neutrino mass type (Majorana or Dirac), and the CP-violating phases, including Majorana phases. Most of these observables are difficult to measure in neutrino oscillation experiments. There are advantages to using atomic targets, such as the closeness of available atomic energies to anticipated neutrino masses, over nuclear target experiments such as the end point spectrum of beta decay and two-electron line spectrum in the neutrinoless double beta decay, both of which address some of the overlapping objectives with atomic/molecular experiments. A disadvantage of using atomic targets, the smallness of rates, is overcome by the macro-coherent amplification mechanism. The atomic or molecular process we use is a cooperative deexcitation of a collective body of atoms in a metastable level vertical bar e > emitting a neutrino pair and a photon: vertical bar e > -> vertical bar g > + gamma + nu(i)nu(j), where nu(i)s are neutrino mass eigenstates. The macro-coherence is developed by trigger-laser irradiation of two colors, which frequently causes the two-photon process vertical bar e > <-> vertical bar g > + gamma + gamma, vertical bar e > + gamma <-> vertical bar g > + gamma inside the target. We discuss important aspects of the macro-coherence development in detail, by setting up the master equation for the target Bloch vector (whose components are population difference and medium polarization) and the propagating electric field. Our master equation includes the effects of phase decoherence of medium polarization and decay of population difference. The spectral rate (the number of events per unit time) of macro-coherent radiative emission of a neutrino pair has three parts, and is given by a factorized formula of the form (overall omega-independent rate denoted by Gamma(0)) x (spectral shape function denoted by I (omega)) x (time-evolving dynamical factor), where omega is the photon energy. The constant factor Gamma(0) determines the overall rate in the unit of 1/time, and for Xe it is of the order of 1Hz(n/10(22) cm(-3))(3) (V/10(2) cm(3)). The dynamical factor is time dependent and is given by the space integrated quantity, over the entire target, of the product of the magnitude squared of the coherent polarization and the field strength (in the units of the maximally extractable energy density) stored inside the target. The asymptotic value of the time-evolving dynamical factor is given by the contribution of the field condensate accompanied by macroscopic coherence, which is calculated using the static limit of the master equation. With an appropriate choice of heavy target atoms or molecules such as Xe and I-2 that have a large M1 x E1 matrix element between vertical bar e > and vertical bar g >, we show that one can determine three neutrino masses along with distinction of the mass hierarchy pattern (normal or inverted) by measuring the spectral shape I (omega).If one uses a target of available energy of a fraction of 1 eV, the most experimentally challenging observable, the Majorana CP phases may be determined, comparing the detected rate with differences of theoretical expectations which exist at the level of several percent. The Majorana CP-violating phase is expected to be crucial to the understanding of the matter-antimatter imbalance in our universe. Our master equation, when applied to E1 x E1 transitions such as pH(2) vibrational Xv = 1 -> 0, can describe explosive paired superradiance events in which most of the energy stored in vertical bar e > is released in the order of a few nanoseconds. The present paper is intended to be self-contained, explaining some details of related theoretical works in the past, and reports on new simulations and the ongoing experimental efforts of the project to realize neutrino mass spectroscopy using atoms/molecules.

DOI： 10.1093/ptep/pts066

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Production of spin-aligned RI beam via two-step fragmentation with dispersion matching Reviewed

Y. Ichikawa, H. Ueno, Y. Ishii, T. Furukawa, A. Yoshimi, D. Kameda, H. Watanabe, N. Aoi, K. Asahi, D. L. Balabanski, R. Chevrier, J. M. Daugas, N. Fukuda, G. Georgiev, H. Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, T. Kubo, T. Nanao, T. Ohnishi, K. Suzuki, M. Tsuchiya, H. Takeda, M. M. Rajabali

RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011 381 2012

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To produce a radioactive-isotope (RI) beam with high spin alignment, we have developed a novel method, the two-step projectile-fragmentation (PF) method, that employs momentum-dispersion matching. An on-line experiment to produce Al-32 from Ca-48 via Al-33 was performed at RIKEN RI Beam Factory. In the experiment, we succeeded in producing approximately 8% spin alignment in an RI beam of Al-32. In this paper, we focus on evaluating the magnitude of spin alignment realized in one-nucleon removal from Al-33.

DOI： 10.1088/1742-6596/381/1/012090

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Development of longitudinal-gradient magnet for time focusing of ultra-cold neutron with anisotropic inter-pole Reviewed

Yasushi Arimoto, Yoshihisa Iwashita, Tamaki Yoshioka, Masaaki Kitaguchi, Sohei Imajo, Hirohiko M. Shimizu, Koichiro Asahi, Takashi Ino, Yoshio Kamiya, Kenji Mishima, Suguru Muto, Kenji Sakai, Tatsushi Shima, Kaoru Taketani, Satoru Yamashita, Akihiro Yoshimi

IEEE Transactions on Applied Superconductivity 22 ( 3 ) 2012

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Ultra-cold neutron (UCN) is attractive for a search of the neutron electric dipole moment (nEDM). It is crucial to store UCNs with high density in a bottle for nEDM measurement apparatus. To increase the density, time focusing technique can be useful, where slow neutrons are accelerated and fast neutrons are decelerated by using magnetic potential. This device is called rebuncher. The rebuncher consists of a gradient magnet, RF coil, and neutron guide. The magnet generates a field gradient of 3.5 T/m (from 1 T to 0.2 T within 24 cm) in the longitudinal direction. By using anisotropic inter-poles, the magnet is compact and keeps the gradient uniform. The fabricated magnet showed good performance as designed. © 2012 IEEE.

DOI： 10.1109/TASC.2012.2183569

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QUADRUPOLE MOMENT OF THE 7/2(1) ISOMER STATE OF S-43M Reviewed

R. Chevrier, J. M. Daugas, L. Gaudefroy, Y. Ichikawa, H. Ueno, M. Hass, H. Haas, S. Cottenier, N. Aoi, K. Asahi, D. L. Balabanski, N. Fukuda, T. Furukawa, G. Georgiev, H. Hayashi, H. Iijima, N. Inabe, T. Inoue, M. Ishihara, Y. Ishii, D. Kameda, T. Kubo, T. Nanao, G. Neyens, T. Ohnishi, M. M. Rajabali, K. Suzuki, H. Takeda, M. Tsuchiya, N. Vermeulen, H. Watanabe, A. Yoshimi

PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON EXOTIC NUCLEI (EXON 2012) 59 - 66 2012

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We report on the spectroscopic quadrupole moment of the 7/2 isomer state [E*=320.5(5) keV, T-1/2=415(5) ns, vertical bar Q(s)vertical bar=23(3) efm(2)] in the neutron-rich S-43 nucleus, using the Time Dependent Perturbed Angular Distribution (TDPAD) method at RIKEN. The measured vertical bar Qs vertical bar is larger than that expected for a single particle state. Comparison to shell model calculations performed using the SDPF-U interaction, show that correlations drive the isomeric state away from a purely spherical shape.

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Frequency characteristics of a nuclear spin maser for the search for the electric dipole moment of Xe-129 atom Reviewed

T. Inoue, M. Tsuchiya, T. Furukawa, H. Hayashi, T. Nanao, A. Yoshimi, M. Uchida, Y. Matsuo, K. Asahi

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES 43 ( 3 ) 847 - 850 2011.1

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Frequency characteristics of a Xe-129 nuclear spin maser was studied, which is under development at Tokyo Institute of Technology for the search for a permanent electric dipole moment in diamagnetic Xe-129 atom. Drifts in the solenoid current and cell temperature were found to be the most influential factors on the maser frequency. From correlation coefficient analysis, there seem to exist other origins of frequency fluctuation, such as phase drifts in the maser oscillation. In order to improve the stability of the maser frequency, the intensity of the pumping laser required to fully polarize Xe-129 nuclei was evaluated. Construction of a polarization assessment system for Xe-129 gas cells and development of a new scheme of current stabilization are also remarked. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physe.2010.07.066

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Development of high-sensitivity NMOR magnetometry for an EDM experiment Reviewed

T. Nanao, A. Yoshimi, T. Inoue, T. Furukawa, M. Tsuchiya, H. Hayashi, M. Uchida, K. Asahi

INTERNATIONAL NUCLEAR PHYSICS CONFERENCE 2010 (INPC): STANDARD MODEL TESTS AND FUNDAMENTAL SYMMETRIES 312 2011

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：IOP PUBLISHING LTD

Developments are in progress aiming at the search for a permanent Electric Dipole Moment (EDM) in (129)Xe atom using a low-frequency nuclear spin maser. In the EDM experiment, drifts in the applied static magnetic field in a long time scale are the dominating source of errors in frequency determination The stability of the applied field and its monitoring by use of a high sensitivity magnetometer are thus the indispensable part of the EDM experiment. We are developing a magnetometer based on the Nonlinear Magneto-Optical Rotation (NMOR) effect in Rb atom. The sharp response to the magnetic field in this apparatus relies on a long relaxation time of the atomic spin alignment induced by linearly polarized laser light, and thus the suppression of the atomic decoherence should be essential for its sensitivity. Coating the inner walls of the cell with an antirelaxation layer, introducing a buffer gas in the cell and cancelling the transverse magnetic field should be effective in preventing atoms from depolarization. We obtained several NMOR spectra for Rb in cylindrical cells in such attempts. Up to now a sensitivity of delta B=1.5 x 10(-5) G has been attained in the present setup.

DOI： 10.1088/1742-6596/312/10/102015

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Magnetic Field Stabilization for (129)Xe EDM Search Experiment Reviewed

Takeshi Furukawa, Takeshi Inoue, Tsubasa Nanao, Akihiro Yoshimi, Masato Tsuchiya, Hironori Hayashi, Makoto Uchida, Koichiro Asahi

INTERNATIONAL NUCLEAR PHYSICS CONFERENCE 2010 (INPC): STANDARD MODEL TESTS AND FUNDAMENTAL SYMMETRIES 312 2011

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Magnetic field stabilization is a crucial condition parameter for many kinds of ultra-high precision measurements such as a search for an electric dipole moment (EDM). The instability of magnetic field strength often arises from the drift of current flow in a solenoid coil to generate the magnetic field. For our EDM search experiment with maser oscillating diamagnetic (129)Xe atoms, we have developed a new stabilized current source based on a feedback system which is devised to correct the amount of current flow measured precisely with high-precision digital multimeter and standard resistor. Using this new current source, we have successfully reduced the drifts of coil current by at least a factor of 100 compared to commercially available current sources.

DOI： 10.1088/1742-6596/312/10/102005

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Search for an EDM in diamagnetic atom (129)Xe with nuclear spin maser technique Reviewed

Takeshi Inoue, Masato Tsuchiya, Hironori Hayashi, Tsubasa Nanao, Kunifumi Suzuki, Akihiro Yoshimi, Takeshi Furukawa, Makoto Uchida, Koichiro Asahi

INTERNATIONAL NUCLEAR PHYSICS CONFERENCE 2010 (INPC): STANDARD MODEL TESTS AND FUNDAMENTAL SYMMETRIES 312 2011

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：IOP PUBLISHING LTD

Present status of the development of a nuclear spin maser for a (129)Xe atomic EDM search is reported. We studied the frequency behavior of the spin maser presently under operation, and found that the drift in the frequency is correlated with the maser amplitude drift. Also, a high-voltage application system for the (129)Xe precession cell was constructed. The leakage current measured is at present on the level of nA when a high voltage of 10 kV was applied, and is a subject of improvement to be achieved in near future.

DOI： 10.1088/1742-6596/312/10/102008

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Search for an Electric Dipole Moment in Xe-129 Atom with Nuclear Spin Oscillator Technique Reviewed

K. Asahi, T. Furukawa, T. Inoue, A. Yoshimi, T. Nanao, M. Chikamori, K. Suzuki, M. Tsuchiya, H. Hayashi, M. Uchida, H. Ueno, Y. Matsuo, T. Fukuyama

INTERNATIONAL SYMPOSIUM: NANOSCIENCE AND QUANTUM PHYSICS 2011 (NANOPHYS'11) 302 2011

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Development of a nuclear spin oscillator intended for the experimental search for an electric dipole moment in Xe-129 atom is reported. The spin oscillation is brought about by polarizing Xe-129 nuclear spins by spin exchange with optically polarized Rb atoms, detecting the spin precession through the transmission of a circularly polarized laser light, and applying a feedback field according to the detected spins. Until present, a frequency precision, in a measurement time of T = 45,000 s, of delta nu = 5.2 nHz has been achieved.

DOI： 10.1088/1742-6596/302/1/012039

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Experimental search for Xe-129 atomic EDM with nuclear spin maser technique Reviewed

T. Inoue, T. Furukawa, T. Nanao, A. Yoshimi, K. Suzuki, M. Chikamori, M. Tsuchiya, H. Hayashi, M. Uchida, K. Asahi

2ND INTERNATIONAL WORKSHOP ON THE PHYSICS OF FUNDAMENTAL SYMMETRIES AND INTERACTIONS (PSI) 17 2011

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELSEVIER SCIENCE BV

The development of a nuclear spin oscillator system, namely a spin maser with an external feedback, for use in the search for Xe-129 atomic EDM is presented. By introducing a new current source for the B-0 field solenoid, drifts in the maser frequency were remarkably suppressed. This in turn clearly brought out the correlation between the maser frequency and the environmental field. Correcting for the effect of the environmental field, the frequency precision of 5 nHz in the measurement time of 45,000 s was attained. Origins of the remaining drifts in the maser frequency are now under investigation.

DOI： 10.1016/j.phpro.2011.06.024

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Development of NMOR magnetometer for spin-maser EDM experiment Reviewed

A. Yoshimi, T. Nanao, T. Inoue, T. Furukawa, M. Uchida, M. Tsuchiya, H. Hayashi, M. Chikamori, K. Asahi

2ND INTERNATIONAL WORKSHOP ON THE PHYSICS OF FUNDAMENTAL SYMMETRIES AND INTERACTIONS (PSI) 17 2011

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELSEVIER SCIENCE BV

We have been developing a high sensitivity atomic magnetometer for atomic EDM experiments using a low-frequency nuclear spin maser. In the developed nuclear spin maser of Xe-129, suppression of drift and fluctuation in the magnetic field is one of the important issues. The magnetometer being developed for spin maser EDM experiments utilizes the nonlinear magneto optical rotation (NMOR) effect in Rb atomic vapor. The enhancement of the optical rotation in a small magnetic field relies on the long spin-coherence time of Rb atoms in a vapor cell. The NMOR spectrum was measured by using fabricated Rb cells coated with an anti-relaxation material. The NMOR spectrum dependence on laser frequency, cell coating, and laser beam diameter were investigated. The magnetic sensitivity at present is 0.2 mu G/root Hz from observed NMOR and noise spectra.

DOI： 10.1016/j.phpro.2011.06.043

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Longitudinal-gradient magnet for time focusing of ultra-cold neutrons

Y. Arimoto, T. Yoshioka, H. M. Shimizu, K. Mishima, T. Ino, K. Taketani, S. Muto, M. Kitaguchi, S. Imajo, Y. Iwashita, S. Yamashita, Y. Kamiya, A. Yoshimi, K. Asahi, T. Shima, K. Sakai

Physics Procedia 17 20 - 29 2011

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A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper - a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of -3 cm≤ y ≤ 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B magnet is capable of accepting UCNs in the velocity range 2.3∼3.3 m/s. © 2011 Published by Elsevier B.V. 0 0

DOI： 10.1016/j.phpro.2011.06.013

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18pSK-14 Photon detection from stopped ^<87>Rb atoms injected into superfluid helium for a new nuclear laser spectroscopy of rare radioisotopes

Furukawa T., Matuura Y., Kato Y., Yamaguchi Y., Imamura K., Makuta M., Hatakeyama A., Wada M., Sonoda T., Itou Y., Nanao T., Wakui T., Kobayashi T., Nishimura S., Nishimura M., Kondo Y., Aoi N., Yoneda K., Kubono S., Ueno H., Shimoda T., Shinozuka T., Sasaki A., Asahi K., Matsuo Y., Izumi S., Ichikawa Y., Yoshimi A., Tajiri K., Ishii Y., Yoshida N.

Meeting Abstracts of the Physical Society of Japan 66 91 - 91 2011

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DOI： 10.11316/jpsgaiyo.66.2.1.0_91_3

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Photon detection from stopped ⁸⁷Rb atoms injected into superfluid helium for a new nuclear laser spectroscopy of rare radioisotopes

T. Furukawa, T. Wakui, A. Sasaki, S. Izumi, Y. Ichikawa, A. Yoshimi, K. Tajiri, Y. Ishii, N. Yoshida, Y. Matsuura, Y. Kato, Y. Yamaguchi, K. Imamura, M. Makuta, A. Hatakeyama, M. Wada, T. Sonoda, Y. Ito, T. Nanao, T. Kobayashi, S. Nishimura, M. Nishimura, Y. Kondo, N. Aoi, K. Yoneda, S. Kubono, Y. Ohshiro, H. Ueno, T. Shimoda, T. Shinozuka, K. Asahi, Y. Matsuo

Journal of Physics: Conference Series 302 ( 1 ) 2011

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We have been developing a new nuclear laser spectroscopic method "OROCHI" for determining spins and moments of exotic RIs. This is a method based on the combination of superfluid helium as a stopper of radioactive isotope (RI) beam and in-situ laser spectroscopy of RI atoms. This unique method will enable us to measure nuclear spins and electromagnetic moments of extremely low yield RI (less than 1 particle per second). To confirm the feasibility of this method for rare radioisotopes, we carried out the first on-line experiment with a 87Rb beam, aiming at evaluating the minimum beam intensity required for the measurement. The LIF (Laser Induced Fluorescence) photons from the 87Rb atoms stopped in He II are successfully observed in the on-line experiment. The obtained LIF intensity is nearly consistent with the intensity calculated from the photo-absorption cross section of atoms in He II.

DOI： 10.1088/1742-6596/302/1/012054

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28pGK-2 Photon detection from stopped ^<87>Rb atoms injected into superfluid helium for a new nuclear laser spectroscopy of rare radioisotopes

Furukawa T., Matuura Y., Kato Y., Yamaguchi Y., Imamura K., Makuta M., Hatakeyama A., Wada M., Sonoda T., Itou Y., Nanao T., Wakui T., Kobayashi T., Nishimura S., Nishimura M., Kondo Y., Aoi N., Yoneda K., Kubono S., Ohshiro Y., Ueno H., Shimoda T., Sasaki A., Shinozuka T., Asahi K., Matsuo Y., Izumi S., Ichikawa Y., Yoshimi A., Tajiri K., Ishii Y., Yoshida N.

Meeting Abstracts of the Physical Society of Japan 66 99 - 99 2011

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.66.1.1.0_99_2

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Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a 238U Beam at 345 MeV/nucleon

Tetsuya Ohnishi, Toshiyuki Kubo, Kensuke Kusaka, Atsushi Yoshida, Koichi Yoshida, Masao Ohtake, Naoki Fukuda, Hiroyuki Takeda, Daisuke Kameda, Kanenobu Tanaka, Naohito Inabe, Yoshiyuki Yanagisawa, Yasuyuki Gono, Hiroshi Watanabe, Hideaki Otsu, Hidetada Baba, Takashi Ichihara, Yoshitaka Yamaguchi, Maya Takechi, Shunji Nishimura, Hideki Ueno, Akihiro Yoshimi, Hiroyoshi Sakurai, Tohru Motobayashi, Taro Nakao, Yutaka Mizoi, Masafumi Matsushita, Kazuo Ieki, Nobuyuki Kobayashi, Kana Tanaka, Yosuke Kawada, Naoki Tanaka, Shigeki Deguchi, Yoshiteru Satou, Yosuke Kondo, Takashi Nakamura, Kenta Yoshinaga, Chihiro Ishii, Hideakira Yoshii, Yuki Miyashita, Nobuya Uematsu, Yasutsugu Shiraki, Toshiyuki Sumikama, Junsei Chiba, Eiji Ideguchi, Akito Saito, Takayuki Yamaguchi, Isao Hachiuma, Takeshi Suzuki, Tetsuaki Moriguchi, Akira Ozawa, Takashi Ohtsubo, Michael A. Famiano, Hans Geissel, Anthony S. Nettleton, Oleg B. Tarasov, Daniel P. Bazin, Bradley M. Sherrill, Shashikant L. Manikonda, Jerry A. Nolen

Journal of the Physical Society of Japan 79 ( 7 ) 073201 - 073201 2010.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan

DOI： 10.1143/jpsj.79.073201

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Precise nuclear moments of extremely proton-rich nuclus Al-23

T. Nagatomo, H. Ueno, M. Mihara, K. Matsuta, A. Yoshimi, Y. Ichikawa, K. Yamada, H. Kawamura, A. Ozawa, T. Moriguchi, Y. Ishibashi, K. Asahi, M. Uchida, K. Suzuki, T. Inoue, Y. Hasama, H. Iijima, T. Sumikama, M. Fukuda, T. Minamisono

HYPERFINE INTERACTIONS 198 ( 1-3 ) 103 - 107 2010.6

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Electric quadrupole coupling constant eqQ/h of the extremely proton-rich Al-23 (wI(pi) = 5/2(+), T-1/2 = 0.47 s) nucleus implanted into an Al2O3 single crystal has been measured for the first time, using the beta-ray detecting nuclear quadrupole resonance method (beta-NQR) in a high magnetic field. As a preliminary result, the quadrupole coupling constant was determined as vertical bar eqQ/h(Al-23)vertical bar = 2.66 +/- 0.77 MHz. Using the quadrupole coupling constant of Al-27 in Al2O3 as a reference, the Q moment of the ground state of Al-23 was extracted as vertical bar Q(Al-23)vertical bar similar to 160 mb, which is well explained by the shell model calculation in the sd-shell model space with the USD interaction.

DOI： 10.1007/s10751-010-0262-8

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Beta-NMR measurement of ⁵⁸Cu in Si

M. Mihara, T. Izumikawa, H. Ueno, K. Matsuta, D. Nishimura, T. Nagatomo, T. Moriguchi, Y. Ito, D. Nagae, M. Fukuda, A. Yoshimi, K. Yamada, M. Takechi, Y. Ichikawa, S. Momota, Y. Hirayama, T. Ohtsubo, S. Suzuki, T. Kubo, Y. Namiki, A. Ozawa, Y. Ishibashi, H. Oishi, K. Suzuki, I. Hachiuma, K. Namihira, D. Horikawa, T. Minamisono, T. Yamaguchi, T. Kuboki, T. Suzuki, K. Satoh, Y. Kobayashi, K. Asahi, K. Matsukawa, K. Shirai

Hyperfine Interactions 197 ( 1 ) 143 - 147 2010

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The β-NMR study of short-lived nucleus 58Cu (Iπ = 1+, T1/2 = 3.2 s) in Si has been performed. Spin polarization of 58Cu induced by the charge exchange reaction of 58Ni was observed in Si at 15 K. The 58Cu magnetic moment {pipe}μ[58Cu]{pipe} = (0.46±0.03)μN deduced from the β-NMR spectrum is consistent with the previous results on the laser spectroscopy. The present result shows that the 58Cu nucleus is promising as a new nuclear probe for the microscopic study of Cu impurities in Si. © 2010 Springer Science+Business Media B.V.

DOI： 10.1007/s10751-010-0249-5

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Electric quadrupole moment of the neutron-rich Al-33 Reviewed

T. Nagatomo, K. Shimada, K. Asahi, D. L. Balabanski, J. M. Daugas, M. Depuydt, M. De Rydt, L. Gaudefroy, S. Grevy, Y. Hasama, Y. Ichikawa, D. Kameda, P. Morel, L. Perrot, C. Stoedel, J. C. Thomas, W. Vanderheijden, N. Vermeulen, P. Vingerhoets, A. Yoshimi, G. Neyens, H. Ueno

EUROPEAN PHYSICAL JOURNAL A 42 ( 3 ) 383 - 385 2009.12

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The nuclear electric quadrupole moment (Q moment) of the neutron-rich nucleus Al-33 (I = 5/2, T-1/2 = 41 ms) has been measured by the beta-ray detected nuclear quadrupole resonance (beta-NQR) method for the first time. The Al-33 nucleus is considered to be on the border of the island of inversion within which a significant intrusion of the pf orbits occurs across the N = 20 shell gap and the intrusion causes an anomalous enhancement of the Q moment. Polarized Al-33 nuclei were produced from S-36 (77.5MeV/u) beams through the fragmentation process and separated by LISE fragment separator at GANIL. The Al-33 nuclei were implanted into a Al2O3 single-crystal plate and the beta-NQR spectrum was successfully obtained.

DOI： 10.1140/epja/i2009-10885-3

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g factors of N17and N18 remeasured

M. De Rydt, D. L. Balabanski, J. M. Daugas, P. Himpe, D. Kameda, R. Lozeva, P. Morel, L. Perrot, K. Shimada, C. Stödel, T. Sugimoto, J. C. Thomas, H. Ueno, N. Vermeulen, P. Vingerhoets, A. Yoshimi, G. Neyens

Physical Review C 80 ( 3 ) 2009.9

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevc.80.037306

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Ground-state electric quadrupole moment of Al31

D. Nagae, H. Ueno, D. Kameda, M. Takemura, K. Asahi, K. Takase, A. Yoshimi, T. Sugimoto, K. Shimada, T. Nagatomo, M. Uchida, T. Arai, T. Inoue, S. Kagami, N. Hatakeyama, H. Kawamura, K. Narita, J. Murata

Physical Review C 79 ( 2 ) 2009.2

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DOI： 10.1103/physrevc.79.027301

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Nuclear Spin Maser at Highly Stabilized Low Magnetic Field and Search for Atomic EDM Reviewed

A. Yoshimi, K. Asahi, T. Inoue, M. Uchida, N. Hatakeyama, M. Tsuchiya, S. Kagami

SPIN PHYSICS 1149 249 - + 2009

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

A nuclear spin maser is operated at a low static field through an active feedback scheme based on an optical nuclear spin detection and succeeding spin control by a transverse field application. The frequency stability of this optical-coupling spin maser is improved by installation of a low-noise current source for a solenoid magnet producing a static magnetic field in the maser operation. Experimental devices for application of the maser to EDM experiment are being developed.

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Nuclear Structure Studies with Polarized Radioactive Beams Reviewed

K. Asahi, H. Ueno, K. Shimada, T. Nagatomo, A. Yoshimi, D. Nagae, D. Kameda, M. Uchida, T. Inoue, M. Hatakeyama, S. Kagami, Y. Hasama, K. Suzuki, J. Murata, H. Kawamura, K. Narita, M. Ishihara

SPIN PHYSICS 1149 90 - + 2009

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Nuclear moment studies on nuclei far from the P-stability line, performed by taking advantage of the projectile fragmentation reaction, are reviewed. A method to produce spin polarization/alignment in the projectile fragments was developed and utilized for the beta-NMR/NQR measurements. Several new findings in nuclear structure physics were obtained from the nuclear moment experiments done with these techniques.

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Precision measurement of the electric quadrupole moment of 31Al and determination of the effective proton charge in the sd-shell Reviewed

M. De Rydt, G. Neyens, K. Asahi, D.L. Balabanski, J.M. Daugas, M. Depuydt, L. Gaudefroy, S. Grevy, Y. Hasama, Y. Ichikawa, P. Morel, T. Nagatomo, T. Otsuka, L. Perrot, K. Shimada, C. Stodel, J.C. Thomas, H. Ueno, Y. Utsuno, W. Vanderheijden, N. Vermeulen, P. Vingerhoets, A. Yoshimi

Phys. Lett. B 678 ( 4 ) 344 - 349 2009

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The electric quadrupole coupling constant of the Al-31 ground state is measured to be nu(Q) = vertical bar eQV(zz)/h vertical bar = 2196(21) kHz using two different beta-NMR (Nuclear Magnetic Resonance) techniques. For the first time, a direct comparison is made between the continuous If technique and the adiabatic fast passage method. The obtained coupling constants of both methods are in excellent agreement with each other and a precise value for the quadrupole moment of Al-31 has been deduced: vertical bar Q(Al-31)vertical bar = 134.0(16) mb. Comparison of this value with large-scale shell-model calculations in the sd and sdpf valence spaces Suggests that the Al-31 ground state is dominated by normal sd-shell configurations with a possible small contribution of intruder states. The obtained value for vertical bar Q(Al-31)vertical bar and a compilation of measured quadrupole moments of odd-Z even-N isotopes in comparison with shell-model calculations shows that the proton effective charge e(p) = 1.1e provides a much better description of the nuclear properties in the sd-shell than the adopted value e(p) = 1.3e. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physletb.2009.06.043

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29pZC-10 Optical pumping of Ag atoms in superfluid helium

Furukawa T., Yamaguchi K., Wada M., Sonoda T., Takamine A., Ueno H., Yoshimi A., Aoi N., Nishimura S., Togano Y., Takechi M., Fujikake K., Odahara A., Shimoda T., Shinozuka T., Motobayashi T., Matsuo Y., Hatakeyama A., Kobayashi T., Matsuura Y., Sasaki A., Hoshino S., Wakui T., Kazato M.

Meeting Abstracts of the Physical Society of Japan 64 80 - 80 2009

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DOI： 10.11316/jpsgaiyo.64.1.1.0_80_4

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29pZC-8 Development of fluorescence detection system for nuclear laser spectroscopy in He II

Sasaki A., Kobayashi T., Ueno H., Yoshimi A., Aoi N., Nishimura S., Togano Y., Takechi M., Hatakeyama A., Fujikake K., Matsuura Y., Hoshino S., Odahara A., Shimoda T., Motobayashi T., Shinozuka T., Matsuo Y., Wakui T., Furukawa T., Kazato M., Yamaguchi K., Wada M., Sonoda T., Takamine A.

Meeting Abstracts of the Physical Society of Japan 64 80 - 80 2009

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.64.1.1.0_80_2

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Electric quadrupole moment of 31Al

D. Nagae, H. Ueno, D. Kameda, M. Takemura, K. Asahi, K. Takase, A. Yoshimi, T. Sugimoto, K. Shimada, T. Nagatomo, M. Uchida, T. Arai, T. Inoue, S. Kagami, N. Hatakeyama, J. Murata, H. Kawamura, K. Narita

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 266 ( 19-20 ) 4612 - 4615 2008.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.nimb.2008.05.111

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Temperature-dependent behavior of impurity atoms implanted in highly oriented pyrolytic graphite - An application of a new online TDPAC method Reviewed

Wataru Sato, Hideki Ueno, Hiroshi Watanabe, Hisanori Miyoshi, Akihiro Yoshimi, Daisuke Kameda, Takashi Ito, Kenzi Shimada, Jou Kaihara, Shinichi Suda, Yoshio Kobayashi, Atsushi Shinohara, Yoshitaka Ohkubo, Koichiro Asahi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 ( 9 ) 2008.9

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DOI： 10.1143/JPSJ.77.095001

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Other Link： http://orcid.org/0000-0003-1971-4313
Optical-coupling nuclear spin maser under highly stabilized low static field Reviewed

A. Yoshimi, T. Inoue, M. Uchida, N. Hatakeyama, K. Asahi

HYPERFINE INTERACTIONS 181 ( 1-3 ) 111 - 114 2008.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

A nuclear spin maser of a new type, that employs a feedback scheme based on optical nuclear spin detection, has been fabricated. The spin maser is operated at a low static field of 30 mG by using the optical detection method. The frequency stability and precision of the spin maser have been improved by a highly stabilized current source for the static magnetic field. An experimental setup to search for an electric dipole moment (EDM) in (129)Xe atom is being developed.

DOI： 10.1007/s10751-008-9630-z

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Online time-differential perturbed angular correlation study with an O-19 beam - Residence sites of oxygen atoms in highly oriented pyrolytic graphite Reviewed

W. Sato, H. Ueno, H. Watanabe, H. Miyoshi, A. Yoshimi, D. Kameda, T. Ito, K. Shimada, J. Kalhara, S. Suda, Y. Kobayashi, A. Shinohara, Y. Ohkubo, K. Asahi

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 266 ( 2 ) 316 - 322 2008.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The online time-differential perturbed angular correlation (TDPAC) method was applied to a study of the physical states of a probe F-19, the beta(-) decay product of O-19 (t(1/2) = 26.9 s), implanted in highly oriented pyrolytic graphite. The observed magnitude of the electric field gradient at the probe nucleus, vertical bar V-zz vertical bar = 2.91(17) x 10(22) V m(-2), suggests that the incident O-19 atoms are stabilized at an interlayer position with point group C-3v. Exhibiting observed TDPAC spectra having a clear sample-to-detector configuration dependence, we demonstrate the applicability of the present online method with a short-lived radioactive O-19 beam. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nimb.2007.11.001

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Development of atomic-beam resonance method to measure the nuclear moments of unstable nuclei

T. Sugimoto, K. Asahi, H. Kawamura, J. Murata, D. Nagae, K. Shimada, H. Ueno, A. Yoshimi

Hyperfine Interactions 181 ( 1-3 ) 141 - 144 2008.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media {LLC}

DOI： 10.1007/s10751-008-9705-x

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22aSD-5 Present status of preparation in "OROCHI" experiment new laser spectroscopy of exotic RI atoms in superfluid helium

Furukawa T., Aoi N., Takechi M., Kobayashi T., Wada M., Sonoda T., Takamine A., Togano Y., Fujikake K., Matsura Y., Odahara A., Matsuo Y., Shimoda T., Shinozuka T., Motobayashi T., Hatakeyama A., Kazato M., Hoshino S., Sasaki A., Wakui T., Ueno H., Yoshimi A.

Meeting Abstracts of the Physical Society of Japan 63 65 - 65 2008

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Language：Japanese Publisher：The Physical Society of Japan

DOI： 10.11316/jpsgaiyo.63.2.1.0_65_2

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Fe-57 diffusion in n-type Si after GeV implantation of Mn-57 Reviewed

Y. Yoshida, Y. Kobayashi, K. Yukihira, K. Hayakawa, K. Suzuki, A. Yoshida, H. Ueno, A. Yoshimi, K. Shimada, D. Nagae, K. Asahi, G. Langouche

PHYSICA B-CONDENSED MATTER 401 101 - 104 2007.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

At the RI-beam facility of the RIKEN, Mn-57/Fe-57 isotopes are separated and implanted into n-type FZ-Si (6 x 10(16) As/cm(3)), and subsequently the atomic jump processes of Fe-57 in the Si matrix are observed by Mossbauer spectroscopy on a time scale of 100 ns between 330 and 1200 K. The spectra consist of two components due to "interstitial Fe" and "substitutional Fe", both of which yield the same isomer shifts as those reported in p-type Si, showing long-range diffusion with increasing temperature. The spectra are compared with those simulated from a theoretical model. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2007.08.122

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Electric quadrupole moments of neutron-rich nuclei Al-32 and Al-31 Reviewed

D. Kameda, H. Ueno, K. Asahi, D. Nagae, M. Takemura, K. Shimada, A. Yoshimi, T. Nagatomo, T. Sugimoto, M. Uchida, T. Arai, K. Takase, S. Suda, T. Inoue, J. Murata, H. Kawamura, H. Watanabe, Y. Kobayashi, M. Ishihara

HYPERFINE INTERACTIONS 180 ( 1-3 ) 61 - 64 2007.11

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The electric quadrupole moments for the ground states of Al-32 and Al-31 have been measured by the beta ray-detected nuclear quadrupole resonance method. Spin-polarized Al-32 and Al-31 nuclei were obtained from the fragmentation of Ar-40 projectiles at E/A = 95 MeV/nucleon, and were implanted in a single crystal alpha-Al2O3 stopper. The measured Q moment of Al-32, vertical bar Q(Al-32)vertical bar = 24(2) mb, is in good agreement with a conventional shell-model calculation with a full sd model space and empirical effective charges, while that of Al-31 is considerably smaller than the sd calculations.

DOI： 10.1007/s10751-008-9685-x

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Nuclear moments of neutron-rich aluminum isotopes Reviewed

H. Ueno, D. Kameda, D. Nagae, M. Takemura, K. Asahi, K. Shimada, K. Takase, T. Sugimoto, T. Nagatomo, M. Uchida, T. Arai, T. Inoue, A. Yoshimi, T. Kawamura, K. Narita

EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS 150 185 - 186 2007.11

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Language：English Publishing type：Research paper (scientific journal) Publisher：EDP SCIENCES S A

Ground-state magnetic-dipole moments (mu) of Al30-32 and electric quadrupole moments (Q) of Al-31,Al- 32 have been measured with the beta-NMR method using spin- polarized radioactive-isotope beams produced in projectile-fragmentation reactions. Beams of Al30-32 were obtained by using RIKEN projectile-fragment separator RIPS after the fragmentation of Ar-40 projectiles at an energy of E = 95AMeV on a Nb-93 target. The obtained mu(exp)[Al30-32] and Q(exp)[Al-32] values agree well with shell-model calculations within the sd shell using the USD interaction. Also, Q(exp)[Al-31] was found to be small. Thus, we can conclude that these aluminum isotopes are located outside the island of inversion.

DOI： 10.1140/epjst/e2007-00299-y

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Production of spin-polarized (17)N beam using inverse-kinematics low-energy transfer reactions Reviewed

K. Shimada, D. Nagae, K. Asahi, T. Inoue, K. Takase, S. Kagami, N. Hatakeyama, Y. Kobayashi, H. Ueno, A. Yoshimi, D. Kameda, T. Nagatomo, T. Sugimoto, S. Kubono, H. Yamaguchi, Y. Wakabayashi, G. Amadio, S. Hayakawa, J. Murata, H. Kawamura

HYPERFINE INTERACTIONS 180 ( 1-3 ) 43 - 47 2007.11

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A new method to produce spin-polarized radioactive nuclear beams has been developed, which takes advantage of the low-energy transfer reaction in inverse kinematics. The method provides beam energies of a convenient range so that they may be implanted in a thin stopper, yet allowing the stopper to be spatially separated from the production target. The presence of polarizations of sizes at least vertical bar P vertical bar similar to 0.5% has has been confirmed for a (17)N beam obtained from (9)Be((18)O, (17)N) reaction at theta(Lab) similar to -1.7 degrees.

DOI： 10.1007/s10751-008-9626-8

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Measurement of the electric quadrupole moment of Al-32 Reviewed

D. Kameda, H. Ueno, K. Asahi, M. Takemura, A. Yoshimi, T. Haseyama, M. Uchida, K. Shimada, D. Nagae, G. Kijima, T. Arai, K. Takase, S. Suda, T. Inoue, J. Murata, H. Kawamura, Y. Kobayashi, H. Watanabe, M. Ishihara

PHYSICS LETTERS B 647 ( 2-3 ) 93 - 97 2007.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The electric quadrupole moment Q for the ground state of Al-32 has been measured using the beta-NMR technique. Spin-polarized Al-32 nuclei were obtained from the fragmentation of Ar-40 projectiles at E/A = 95 MeV/nucleon, and were implanted in a single crystal alpha-Al2O3 stopper. The quadrupole moment was deduced from the measured quadrupole coupling constant. The obtained value, vertical bar Q((32)Alg.s.)vertical bar = 24(2) mb, is remarkably small as compared with other Al isotopes, but is well explained by shell model calculations within the sd shell. The present result indicates that Al-32 has a normal sd-shell structure, in contrast to the neighboring N = 19 isotone Mg-31 for which a strongly deformed intruder ground state has been reported to occur. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1036/j.physletb.2007.01.063

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Measurement of electric quadrupole moments for Al-31 using spin polarized RI beams Reviewed

D. Nagae, K. Asahi, H. Ueno, D. Kameda, M. Takemura, K. Takase, A. Yoshimi, T. Sugimoto, T. Nagatomo, Y. Kobayashi, M. Uchida, K. Shimada, T. Arai, T. Inoue, S. Kagami, N. Hatakeyama

PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM 915 853 - + 2007

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The electromagnetic moment is a sensitive probe to investigate microscopic structure. In order to measure the electromagnetic moment beta-NMR and beta-NQR methods are employed taking advantage of the fragment spin polarization produced by the fragmentation reaction. The measurement of the electric quadrupole moment for ground-state Al-31 has been been carried out by beta-NQR method. Spin-polarized Al-31 nuclei were obtained from the fragmentation of Ar-40 projectiles, and were implanted in alpha-Al2O3 stopper. The electric quadrupole moment was deduced from the measured quadrupole coupling constant. The obtained value is vertical bar Q(Al-31)vertical bar = 104(9) e center dot mb.

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Search for an atomic EDM with optical-coupling nuclear spin oscillator Reviewed

K. Asahi, M. Uchida, A. Yoshimi, T. Inoue, N. Hatakeyama

PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM 915 206 - + 2007

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We have constructed a nuclear spin oscillator of a new type, that employs a feedback scheme based on an optical spin detection and suceeding spin control by a transverse field application. This spin oscillator parallels the conventional spin maser in many points, but exhibits advantages and requirements that are different from those with the spin maser. By means of the optical-coupling nuclear spin oscillator, an experimental setup to search for an electric dipole moment (EDM) in a spin 1/2 diamagnetic atom Xe-129 is being developed.

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Production of spin-polarized radioactive ion beams via projectile fragmentation reaction Reviewed

D. Kameda, H. Ueno, K. Asaw, D. Nagae, A. Yoshimi, T. Nagatomo, T. Sugimoto, M. Uchida, M. Takemura, K. Shimada, K. Takase, T. Inoue, G. Kijima, T. Arai, S. Suda, J. Murata, H. Kawamura, Y. Kobayashi, H. Watanabe, M. Ishihara

PSTP 2007 980 283 - + 2007

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

Spin-polarized radioactive ion beams are produced in the projectile fragmentation reaction induced by intermediate-energy heavy ion beams. The degree of spin polarization shows characteristic dependence on the outgoing momentum of the projectile fragment in the magnitude around 1 similar to 10 %. The qualitative behavior is well described by the kinematical model of the fragmentation process. Recently, we have successfully produced spin-polarized beams of aluminum isotopes in the mass A similar to 30 region via the fragmentation of 95 MeV/u Ar-40 projectiles. The magnetic moments of Al-30 and Al-32 and the electric quadrupole moments of Al-31 and Al-32 have been measured using the beta-NMR technique with the polarized RI beams of the Al isotopes.

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Nuclear moment measurements of neutron-rich aluminum isotopes using spin-polarized RI beams: Determination of the boundary of the "Island of inversion" Reviewed

D. Kameda, H. Ueno, K. Asah, M. Takemura, D. Nagae, K. Shimada, A. Yoshimi, Y. Kobayashi, T. Haseyama, M. Uchida, K. Takase, T. Arai, T. Inoue, S. Suda, J. Murata, H. Kawamura, H. Watanabe, M. Ishihara

PROCEEDINGS OF THE 17TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM 915 845 - + 2007

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

The electric quadrupole moment Q for the ground state of Al-32 has been measured using the beta-NMR technique. Spin-polarized Al-32 nuclei were obtained from the fragmentation of 40 Ar projectiles at E/A = 95 MeV/nucleon, and were implanted in a single crystal alpha-Al2O3 stopper. The quadrupole moment was deduced from the measured quadrupole coupling constant. The obtained value, vertical bar Q(Al-32(g.s.))vertical bar = 24(2) mb, was well reproduced by shell model calculations within the sd shell, indicating that Al-32 is a normal sd-shell nucleus. The result is in sharp contrast to the strongly deformed nuclei Mg-32 and Mg-31 neighboring the Al-32 isotope.

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Structure of unstable nuclei from nuclear moments and β decays

K Asahi, M Uchida, K Shimada, D Nagae, D Kameda, H Ueno, A Yoshimi, M Takemura, T Arai, K Takase, T Inoue, H Kawamura, J Murata, H Watanabe, T Haseyama, Y Kobayashi, A Umeya, M Ishihara

Journal of Physics: Conference Series 49 79 - 84 2006.10

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DOI： 10.1088/1742-6596/49/1/018

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Study of electromagnetic moments in unstable nuclei with radioactive nuclear beams

K Asahi, D Kameda, H Ueno, A Yoshimi, M Uchida, H Miyoshi, K Shimada, D Nagae, G Kijima, T Haseyama, H Watanabe, M Takemura, T Arai, S Oshima, A Umeya

Journal of Physics: Conference Series 20 59 - 64 2005.1

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DOI： 10.1088/1742-6596/20/1/010

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Low-frequency nuclear spin maser and search for atomic EDM of Xe-129 Reviewed

A Yoshimi, K Asahi, S Emori, M Uchida, S Oshima

Spin 2004: 16th International Spin Physics Symposium 247 - 250 2005

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

We have developed a nuclear spin maser in which highly polarized nuclei of the noble gas isotope Xe-129 oscillate at the low frequency of 34 Hz. The system is advantageous for detecting a small frequency shift of the nuclear spin precession. We are thus planning to apply this system to the search for an atomic electric dipole moment of Xe-129. We here report the development of the system and its performance.

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Application of the high-spin isomer beams to the secondary fusion reaction and the measurement of g-factor

H. Watanabe, K. Asahi, T. Kishida, H. Ueno, W. Sato, A. Yoshimi, Y. Kobayashi, D. Kameda, H. Miyoshi, T. Fukuchi, Y. Wakabayashi, T. Sasaki, M. Kibe, N. Hokoiwa, A. Odahara, B. Cederwall, K. Lagergren, Zs Podolyák, M. Ishihara, Y. Gono

Nuclear Physics A 746 ( 1-4 ) 540 - 543 2004.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier

A technique for providing high-spin isomers as probes of the fusion reaction and the measurement of g-factor has been worked out at RIKEN. In the study of the fusion reaction 12C(145mSm, xn)157-xEr, the γ rays emitted from the fusion-evaporation residue 154Er have been successfully observed. The nuclear g-factor of the T1/2 = 28 ns high-spin isomer in 149Dy has been measured with the γ-ray TDPAD method. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2004.09.141

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Lifetime of a new high-spin isomer in Dy-150 Reviewed

H Watanabe, Y Wakabayashi, Y Gono, T Fukuchi, H Ueno, W Sato, A Yoshimi, D Kameda, H Miyoshi, T Kishida, Y Kobayashi, T Morikawa, S Motomura, O Kashiyama, K Saito, A Odahara, K Asahi

EUROPEAN PHYSICAL JOURNAL A 19 ( 2 ) 163 - 167 2004.2

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A new high-spin isomer in Dy-150 has been observed at an excitation energy of 10.3 MeV by combining the inverse-kinematic reaction induced by a pulsed beam of Xe-132 and the gamma-ray recoil-shadow technique. The half-life of this isomeric state has been determined to be T-1/2=1.6+/-0.6 ns using the conventional centroid-shift method with the Pr-141(O-16, p6n)Dy-150 reaction at 165 MeV. The mechanism producing high-spin isomers in N=83,84 isotones is qualitatively discussed in terms of the difference of the neutron particle-hole configuration between the high-spin isomer and the lower-lying state.

DOI： 10.1140/epja/i2003-10150-y

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Lifetime of a new high-spin isomer in 150 Dy

H. Watanabe, Y. Wakabayashi, Y. Gono, T. Fukuchi, H. Ueno, W. Sato, A. Yoshimi, D. Kameda, H. Miyoshi, T. Kishida, Y. Kobayashi, T. Morikawa, S. Motomura, O. Kashiyama, K. Saito, A. Odahara, K. Asahi

The European Physical Journal A 19 ( 2 ) 163 - 167 2004.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media {LLC}

DOI： 10.1140/epja/i2003-10150-y

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G-factor measurement for N-19 Reviewed

D Kameda, K Asahi, H Miyoshi, K Shimada, G Kato, S Emori, G Kijima, H Ueno, A Yoshimi, H Watanabe, T Haseyama, Y Kobayashi, J Murata, W Sato, H Ogawa

NEW ERA OF NUCLEAR STRUCTURE PHYSICS 231 - 235 2004

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD

The magnetic moment of N-19 was measured by using a beta-NMR method and a spin-polarized N-19 beam from the fragmentation reaction. As a result, the g value for the N-19 ground state, g = 0.61 +/- 0.03(preliminary), was obtained. The value was compared with those of N-15 and N-17. Contrary to shell-mode predictions that the g value should increase with increasing number of neutrons in the sd shell, the obtained g for N-19(g.s.) is significantly smaller than the g factor for N-17(g.s.).

DOI： 10.1142/9789812702401_0035

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Nuclear moments of nuclei in the neighborhood of the neutron drip line Reviewed

H Ueno, K Asahi, H Ogawa, D Kameda, H Miyoshi, A Yoshimi, H Watanabe, K Shimada, W Sato, K Yoneda, N Imai, Y Kobayashi, M Ishihara, WD Schmidt-Ott

LABYRINTH IN NUCLEAR STRUCTURE 701 135 - 142 2004

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

Based on the beta-NMR method with spin-polarized radioactive-isotope beams, we have been conducting a series of experiments at RIKEN for the measurement the magnetic moments and electric quadrupole moments of light unstable nuclei. From the systematic measurements of nuclear moments in the unstable nuclear region, the effects of the neutron excess on the structure have been discussed. In the mu-moment measurements of the nitrogen isotopes, the outward-directed deviation of mu(N-17) and mu(N-19) from the Schmidt value were observed. In the case of Q-moment, our experimental data show large discrepancy from the shell-model predictions if neutron and proton effective charges are assumed to be constant. By introducing an isospin dependence to the effective charges, the observed Q-moments of boron isotopes can be explained. We also applied the result of mu-moment measurements to the I-pi assignment. Owing to the large difference of mu values among expected 1(pi) candidates, 1(pi)(C-17)=3/2(+) has been definitely assigned.

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g-factor of the high-spin isomer in Dy-149 and a multi-quasiparticle configuration caused by the N=82 core excitations Reviewed

H Watanabe, H Ueno, D Kameda, W Sato, A Yoshimi, H Miyoshi, T Kishida, Y Kobayashi, A Odahara, Y Gono, K Asahi

NUCLEAR PHYSICS A 728 ( 3-4 ) 365 - 378 2003.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The nuclear g-factor of the T-1/2 = 28 ns high-spin isomer in Dy-149 has been measured using the gamma-ray time-differential perturbed angular distribution (TDPAD) technique with a pulsed beam of Xe-132. The experimental value g = +0.41(6) is in good agreement with a fully aligned multi-quasiparticle configuration pi (h(11/2)(2)) circle times nu(f(7/2)h(9/2)i(13/2)(d(3/2)(-2))(0)) This result indicates that only neutron particle-hole excitations across the N = 82 shell-closure occur at this isomeric state. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.nuclphysa.2003.09.007

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Nuclear spin maser with an artificial feedback for fundamental physics Reviewed

A Yoshimi, K Asahi, K Yogo

CZECHOSLOVAK JOURNAL OF PHYSICS 53 B417 - B424 2003

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Language：English Publishing type：Research paper (scientific journal) Publisher：INST PHYSICS ACAD SCI CZECH REPUBLIC

Low frequency spin precession of, the largely polarized Xe-129 nuclei was continuously maintained using the nuclear spin maser technique. This is aiming at the sensitive measurement of the energy shift of the nuclei which should be required in the search for the violation of the fundamental symmetries. It involves the optical detection system of the nuclear spin direction. and the artificial feedback system to maintain the spin precession beyond the intrinsic transverse relaxation time. Its operation was experimentally tested and the frequency properties were analyzed based on. the modified Bloch equations. The plans. of ail application,of the system to physical experiments are described.

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On-line TDPAC studies with the O-19 beam Reviewed

W Sato, H Ueno, H Watanabe, H Ogawa, H Miyoshi, N Imai, A Yoshimi, K Yoneda, D Kameda, Y Kobayashi, K Asahi

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 255 ( 1 ) 183 - 186 2003

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Language：English Publishing type：Research paper (scientific journal) Publisher：KLUWER ACADEMIC PUBL

A new F-19 probe disintegrated from short-lived O-19 has been developed for the first time for time-differential perturbed angular correlation method. The angular correlation coefficient for the relevant cascade has been experimentally estimated to be A(22) = -0.17+/-0.01. As the first application of this technique to condensed matter physics, the probe was implanted in polycrystalline fullerene C-60. We have observed two contrastive perturbations acting on the probe nuclei, which reflect electrostatic and dynamic interactions with the extranuclear field.

DOI： 10.1023/A:1022216806445

DOI： 10.1023/a:1022216806445

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Nuclear spin maser with an artificial feedback mechanism

A Yoshimi, K Asahi, K Sakai, M Tsuda, K Yogo, H Ogawa, T Suzuki, M Nagakura

Physics Letters A 304 ( 1-2 ) 13 - 20 2002.11

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/s0375-9601(02)01324-5

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Quenching of neutron E2 effective charge in neutron-rich nuclei and the ground-state spin-parity of C-17 Reviewed

H Ogawa, K Asahi, H Ueno, H Sakai, H Miyoshi, D Kameda, T Suzuki, H Izumi, N Imai, YX Watanabe, K Yoneda, N Fukuda, H Watanabe, A Yoshimi, W Sato, N Aoi, M Nagakura, T Suga, K Yogo, A Goto, T Honda, Y Kobayashi, WD Schmidt-Ott, G Neyens, S Teughels, A Yoshida, T Kubo, N Ishihara

EUROPEAN PHYSICAL JOURNAL A 13 ( 1-2 ) 81 - 85 2002.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER-VERLAG

The electric quadrupole moment of B-17 and the g-factor of C-17 were measured by using the fragmentation-induced nuclear polarization technique combined with the beta-NMR method. The experimental quadrupole moment of B-17 is found strikingly close to that of the neutron closed-shell isotope B-13, indicating a strong quenching of the neutron E2 core-polarization charge. From the result obtained for the C-17 g-factor, we can conclude that the ground-state spin-parity of C-17 is 3/2(+).

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Assignment of the Ground-State Spin-Parity for ^17C through g-Factor Measurement :

OGAWA Hiroshi, ASAHI Koichiro, UENO Hideki, MIYOSHI Hisanori, KAMEDA Daisuke, IMAI Nobuaki, YONEDA Ken-ichiro, WATANABE Hiroshi, SUGA Toshitaka, OHNO Ken-ichi, YOSHIMI Akihiro, SATO Wataru, SAKAI Kenji, YOGO Katsunori, KOBAYASHI Yoshio, YOSHIDA Atsushi, KUBO Toshiyuki, ISHIHARA Masayasu

Progress of theoretical physics. Supplement ( 146 ) 607 - 608 2002

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Language：English Publisher：Progress of Theoretical Physics

The g-factor for the ^17C ground state was measured by means of the β-NMR spectroscopy with a spin-polarized fragment beam. From the tentative result |g(^17C)| = 0.5054(25), we conclude that the ground-state spin-parity for ^17C is 3/2^+.

DOI： 10.1143/PTPS.146.607

CiNii Article

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Other Link： https://projects.repo.nii.ac.jp/?action=repository_uri&item_id=240417
Radioactive ion beams as microscopic probes into matter

Koichiro Asahi, Yoshio Kobayashi, Hideki Ueno, Akihiro Yoshimi, Wataru Sato, Hiroshi Watanabe, Hisanori Miyoshi, Daisuke Kameda

Anal. Sci. 17 Sup. i613 2001

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Nuclear moment studies with polarized radioactive nuclear beams Reviewed

K Asahi, K Sakai, H Ogawa, H Ueno, Y Kobayashi, A Yoshimi, H Miyoshi, K Yogo, A Goto, T Suga, H Imai, YX Watanabe, K Yoneda, N Fukuda, N Aoi, WD Schmidt-Ott, G Neyens, S Teughels, A Yoshida, T Kubo, M Ishihara

SPIN 2000 570 109 - 118 2001

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

Beams of spin-polarized radioactive nuclei are produced in the projectile fragmentation reaction induced by intermediate-energy heavy ion beams, and are used for the measurement of magnetic dipole and electric quadrupole moments of nuclei in the regions far from stability. In this paper, after remarking the mechanism of fragment polarization and the experimental techniques to make use of it, we discuss the recent results obtained for the electromagnetic moments of light neutron-rich nuclei at RIKEN. Analyses of the observed magnetic moments in terms of shell models show intriguing results which imply that some of the basic nuclear properties, such as the order in energy of the single-particle orbits, the pairing energy between the excess neutrons, and the effective g(s)-factor for a halo nucleon, tend to alter as the degree of neutron excess increases. Also, the measured electric quadrupole moments reveal remarkable quenching of the E2 effective charge in nuclei with large N/Z ratios.

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Effective charge anomaly in neutron-rich nuclei revealed from spin-polarized RI beam experiments Reviewed

H Ogawa, K Sakai, H Ueno, T Suzuki, H Miyoshi, M Nagakura, K Yogo, A Goto, T Suga, T Honda, N Imai, YX Watanabe, K Yoneda, A Yoshimi, N Fukuda, N Aoi, Y Kobayashi, WD Schmidt-Ott, G Neyens, S Teughels, A Yoshida, T Kubo, M Ishihara

SPIN 2000 570 679 - 683 2001

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

The electric quadrupole moment of B-17 was measured by means of spin polarized fragment beams produced by the projectile fragmentation reaction. The experimental quadrupole moment of 17B was very close to that of neutron p-shell closed nucleus B-13. This result indicates that the neutron effective charge for B-17 is considerably smaller than the value commonly used in the sd-shell region.

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Nuclear moment studies with polarized radioactive nuclear beams Reviewed

K Asahi, H Ogawa, H Ueno, Y Kobayashi, W Sato, A Yoshimi, H Watanabe, D Kameda, H Miyoshi, K Sakai, N Imai, K Yoneda, YX Watanabe, N Fukuda, N Aoi, A Yoshida, T Kubo, M Ishihara

HYPERFINE INTERACTIONS 136 183 - 187 2001

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Language：English Publishing type：Research paper (scientific journal) Publisher：KLUWER ACADEMIC PUBL

Magnetic dipole and electric quadrupole moments of nuclei in the light-mass neutron-rich region have been studied by taking advantage of spin-polarized radioactive nuclear beams that have been obtained from the projectile fragmentation reaction. Analyses of the results reveal a few interesting phenomena characteristic of nuclear structures in this region. In particular, we report in some detail the latest result on the magnetic moment of the 17 C ground state. The distinctly small value of the g-factor obtained, | g(C-17 | = 0.5054 +/- 0.0025, clearly excludes a I-pi = 1/2(+) candidate for the spin-parity assignment of this marginally bound nucleus, providing a reasonable account of the non-halo nature reported in recent breakup reaction experiments. Finally, future plans at the upcoming radioactive beam facility presently under construction at RIKEN are briefly mentioned.

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Novel spin maser mechanism studied for high-precision measurement of neutron electric dipole moment Reviewed

A Yoshimi, K Asahi, K Yogo, K Sakai, H Ogawa, T Suzuki, M Nagakura

SPIN 2000 570 353 - 357 2001

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

We propose a new scheme of nuclear spin maser and have performed the experimental and theoretical analyses for its operation, aiming at the significant improvement, in sensitivity of neutron electric dipole moment (EDM). The proposed spin-masing scheme incorporates an artificial feedback mechanism, and is applicable to extremely low density systems of spins such as a bottled ensemble of UCNs. Its operation was experimentally demonstrated by using a spin-polarized Xe-129 gas as a model substance. The frequency analysis suggests that a frequency precision allowing a neutron EDM search with a sensitivity of 10(-28) ecm level is attainable by this maser scheme.

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Development of a detector system for transient magnetic field experiments with radioactive-isotope beams and a test experiment Reviewed

H Ueno, W Sato, H Ogawa, N Aoi, K Yoneda, Y Kobayashi, D Kameda, H Miyoshi, H Watanabe, N Imai, A Yoshimi, J Kaihara, K Asahi

HYPERFINE INTERACTIONS 136 211 - 214 2001

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Language：English Publishing type：Research paper (scientific journal) Publisher：KLUWER ACADEMIC PUBL

For g-factor measurements of excited states of unstable nuclei, we have been developing a setup for the transient field experiment at RIKEN Accelerator Research Facility. For the preparation of ferromagnetic material, thick Gd foils have been annealed. In a test experiment using a Ne-22 beam, the projectile Coulomb excitation to the first excited state has been observed.

DOI： 10.1023/a:1020584316404

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Magnetic moment and electric quadrupole moment of the N ground state

H. Ogawa, K. Asahi, K. Sakai, A. Yoshimi, M. Tsuda, Y. Uchiyama, T. Suzuki, K. Suzuki, N. Kurokawa, M. Adachi, H. Izumi, H. Ueno, T. Shimoda, S. Tanimoto, N. Takahashi, W.-D. Schmidt-Ott, M. Schäfer, S. Fukuda, A. Yoshida, M. Notani, T. Kubo, H. Okuno, H. Sato, N. Aoi, K. Yoneda, H. Iwasaki, N. Fukuda, N. Fukunishi, M. Ishihara, H. Miyatake

Physics Letters B 451 ( 1-2 ) 11 - 18 1999.4

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/s0370-2693(99)00219-1

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Static moments of the N-18 ground state Reviewed

H Ogawa, K Asahi, K Sakai, A Yoshimi, M Tsuda, Y Uchiyama, T Suzuki, K Suzuki, N Kurokawa, M Adachi, H Izumi, H Ueno, T Shimoda, S Tanimoto, N Takahashi, WD Schmidt-Ott, M Schafer, S Fukuda, A Yoshida, M Notani, T Kubo, H Okuno, H Sato, N Aoi, K Yoneda, H Iwasaki, N Fukuda, N Fukunishi, M Ishihara

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 24 ( 8 ) 1399 - 1402 1998.8

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Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

Nuclear magnetic resonance (NMR) of a radioactive nucleus N-18 has been observed through a change in the beta-ray asymmetry, by taking advantage of the fragment spin polarization in the projectile fragmentation reaction. To facilitate the experiment, a new scheme has been developed which allows assessment of the polarization prior to the resonance search in the beta-ray detected NMR experiment. The obtained magnetic moment /mu/ = 0.3279 +/- 0.0017 mu(N) and the electric quadrupole moment /Q/ = 12.1 +/- 1.2 mb are compared with shell-model calculations.

DOI： 10.1088/0954-3899/24/8/013

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Polarized 129Xe solid for polarizing unstable nuclei

H. Sato, M. Tsuda, A. Yoshimi, H. Izumi, H. Ogawa, N. Kurokawa, K. Sakai, M. Adachi, K. Asahi, H. Okuno, T. Kubo, S. Fukuda, A. Yoshida, M. Ishihara, K. Yoneda, M. Notani

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 402 ( 2-3 ) 241 - 243 1998.1

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/s0168-9002(97)00842-5

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Observation of parity-violating neutron spin rotation in the n-139La p-wave resonance Reviewed

K. Sakai, Y. Masuda, T. Adachi, K. Asahi, M. Doi, M. Harada, S. Ishimoto, M. Iinuma, J. Kura, A. Masaike, Y. Matsuda, K. Morimoto, S. Muto, K. Okumura, H. Sato, H.M. Shimizu, A. Yoshimi, Z.J. Zheng

Physics Letters B 391 ( 1-2 ) 11 - 14 1997.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/s0370-2693(96)01447-5

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Magnetic moments ofN17andB17

H. Ueno, K. Asahi, H. Izumi, K. Nagata, H. Ogawa, A. Yoshimi, H. Sato, M. Adachi, Y. Hori, K. Mochinaga, H. Okuno, N. Aoi, M. Ishihara, A. Yoshida, G. Liu, T. Kubo, N. Fukunishi, T. Shimoda, H. Miyatake, M. Sasaki, T. Shirakura, N. Takahashi, S. Mitsuoka, W.-D. Schmidt-Ott

Physical Review C 53 ( 5 ) 2142 - 2151 1996.5

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Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

DOI： 10.1103/physrevc.53.2142

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevC.53.2142/fulltext

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Search for vacuum-ultraviolet photon by deexcitation of the nuclear isomeric state of thorium-229

平木貴宏, BEEKS Kjeld, 藤本弘之, 福永優太, GUAN M., 羽場宏光, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 永澤延元, 岡井晃一, 笹尾登, SCHADEN Fabian, SCHUMM Thorsten, 瀬戸誠, 重河優大, 高取沙悠理, 玉作賢治, 植竹智, 渡部司, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 78 ( 1 ) 2023

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Development of nuclear resonant scattering target for thorium-229 isomer level search

福永優太, BEEKS Kjeld, 藤本弘之, 平木貴宏, GUAN M., 羽場宏光, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 永澤延元, 岡井晃一, 笹尾登, SCHADEN Fabian, SCHUMM THorsten, 瀬戸誠, 重河優大, 高取沙悠理, 玉作賢治, 植竹智, 渡部司, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 78 ( 1 ) 2023

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Search for vacuum-ultraviolet photon by de-excitation from the isomeric state of thorium 229

岡井晃一, BEEKS Kjeld, 藤本弘之, 福永優太, GUAN M., 羽場宏光, 原秀明, 平木貴宏, 稲垣新, 小早川大貴, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 笹尾登, SCHUMM Thorsten, 瀬戸誠, 重河優大, 高取沙悠理, 玉作賢治, 植竹智, 渡部司, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 77 ( 2 ) 2022

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最小エネルギーをもつトリウム229 アイソマー状態の人工的生成 - 原子核時計の実現に向けて Invited Reviewed

増田孝彦, 吉見彰洋, 山口敦史, 吉村浩司

日本物理学会誌 76 ( 7 ) 456 2021.7

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Artificial Production of the Lowest Energy Nuclear Excited State, 229mTh Invited Reviewed

SPring-8/SACLA information 25 ( 2 ) 88 - 95 2020.5

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高輝度X線を用いた核共鳴散乱技術による原子核 229Th アイソマー状態の人工生成 Invited Reviewed

海野弘行, 笠松良崇, 重河優大, 羽場宏光, 平木貴宏, 増田孝彦, 山口敦史, 横北卓也, 吉見彰洋, 吉村浩司

Isotope News; 2020年4月号「展望」 768 2020.4

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Search for VUV signal from isomer level of Th-229

海野弘行, 羽場宏光, 原秀明, 平木貴宏, 藤枝亮, 藤本弘之, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, BEEKS Kjeld, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 75 ( 1 ) 2020

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Experimental status of searching for vacuum ultraviolet light from the 229Th isomeric state

平木貴宏, BEEKS Kjeld, 藤枝亮, 羽場宏光, 原秀明, 海野弘之, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 75 ( 2 ) 2020

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Half-life determination of nuclear excited states of ²²⁹Th by the α-γ coincidence measurement of ²³³U

重河優大, 山口敦史, 鈴木健太, 羽場宏光, 平木貴宏, 菊永英寿, 西村俊二, 笹尾登, 吉見彰洋, 吉村浩司

日本放射化学会討論会(Web) 64th 2020

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トリウム229の原子核時計遷移分光

鈴木健太, 羽場宏光, 原秀明, 平木貴宏, 藤枝亮, 藤本弘之, 海野弘行, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 74 ( 1 ) 2019

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核共鳴散乱を用いたトリウム229アイソマー準位への人工的遷移

海野弘行, 羽場宏光, 原秀明, 平木貴宏, 藤枝亮, 藤本弘之, 鈴木健太, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 74 ( 1 ) 2019

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トリウム229の極低エネルギー原子核時計遷移の探索 II

植竹智, 原秀明, 平木貴宏, 海野弘行, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 鈴木健太, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 73 ( 2 ) ROMBUNNO.12aB102‐14 2018.9

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放射光で探るレーザー光による超精密原子核制御の可能性:229Th 極低核励起準位 Invited Reviewed

吉見彰洋, 笠松良崇, 北尾真司, 瀬戸誠, 増田孝彦, 山口敦史, 依田芳卓, 吉村浩司

日本放射光学会誌 31 305 2018

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Development of Ba ion source for QIB

Fujieda A, Imamura K, Kamigaito O, Nakagawa T, Kanai Y, Ichikawa Y, Nagatomo T, Honda Y, Sakaue S, Sasao N, Yoshimura M, Yoshimura K, Yoshimi A, Uetake S, Miyamoto Y, Masuda T, Hara H

Meeting Abstracts of the Physical Society of Japan 73 ( 0 ) 538 - 538 2018

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トリウム229の極低エネルギー原子核時計遷移の探索

植竹智, 植竹智, 原秀明, 平木貴宏, 岩崎達郎, 笠松良崇, 北尾真司, 小林康浩, 小無健司, 増田孝彦, 増田亮, 宮本祐樹, 岡井晃一, 大久保翔, 尾崎亮太, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 鈴木健太, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

日本物理学会講演概要集(CD-ROM) 72 ( 1 ) Rombun NO.20pH31‐2 2017.3

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相対論的量子イオンビームによる高強度ガンマ線源

本田洋介, 笹尾登, 吉村太彦, 吉村浩二, 吉見彰洋, 植竹智, 増田孝彦, 宮本祐樹, 原秀明, 平木貴宏, 横谷馨, 吉田光宏, 上垣外修一, 中川孝秀, 金井保之, 市川雄一, 長友傑, 坂上和之

日本加速器学会年会(Web) 14th ROMBUNNO.IPP003 (WEB ONLY) 2017

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トリウム229極低エネルギーアイソマー準位探索の進展

大久保翔, 岡井晃一, 岩崎達郎, 原秀明, 宮本祐樹, 増田孝彦, 植竹智, 吉見彰洋, 笹尾登, 吉村太彦, 吉村浩司, 山口敦史, 瀬戸誠, 北尾真司, 小林康浩, 増田亮, 依田芳卓, 笠松良崇, 重河優大, 安田勇輝, 小無健司, 渡部信, STELLMER Simon, SCHUMM Thorsten

日本物理学会講演概要集(CD-ROM) 71 ( 2 ) Rombun NO.21aSH‐12 - 181 2016.9

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DOI： 10.11316/jpsgaiyo.71.2.0_181

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9pAW-11 Coherent two-photon emission from the vibrational excited states of hydrogen molecules I

Miyamoto Yuki, Hara Hideaki, Katsuragawa Masayuki, Kuma Susumu, Masuda Takahiko, Nakano Itsuo, Ohae Chiaki, Sasao Noboru, Tanaka Minoru, Tsutumi Kousuke, Uetake Satoshi, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

Meeting abstracts of the Physical Society of Japan 69 ( 2 ) 92 - 92 2014.8

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9pAW-12 Coherent two photon emission from the vibrational excited state of hydrogen molecules II

Hara Hideaki, Katsuragawa Masayuki, Kuma Susumu, Masuda Takahiko, Miyamoto Yuki, Nakano Itsuo, Ohae Chiaki, Sasao Noboru, Tanaka Minoru, Tsutsumi Kousuke, Uetake Satoshi, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

Meeting abstracts of the Physical Society of Japan 69 ( 2 ) 93 - 93 2014.8

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19aSJ-7 Demonstration of macro-coherent amplification by observing a coherent two-photon emission from hydrogen molecules

Uetake Satoshi, Hara Hideaki, Katsuragawa Masayuki, Kuma Susumu, Masuda Takahiko, Miyamoto Yuki, Nakano Itsuo, Ohae Chiaki, Sasao Noboru, Tanaka Minoru, Tsutsumi Kosuke, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

Meeting abstracts of the Physical Society of Japan 69 ( 2 ) 22 - 22 2014.8

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28aTE-3 Performance evaluation of cell with coexisting ^<129>Xe/^3He

Ohtomo Y., Ichikawa Y., Sato T., Sakamoto Y., Kojima S., Suzuki T., Shirai H., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 69 ( 1 ) 84 - 84 2014.3

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28aTE-4 Experimental search for EDM in ^<129>Xe atom using ^3He comagnetometer III

Sato T., Ichikawa Y., Ohtomo Y., Sakamoto Y., Kojima S., Suzuki T., Shirai H., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 69 ( 1 ) 84 - 84 2014.3

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28aTE-2 Construction and performance check of improved magnetic field stabilization system for EDM measurement 2

Sakamoto Y., Bidinosti C. P., Ichikawa Y., Sato T., Ohtomo Y., Kojima S., Suzuki T., Shirai H., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 69 ( 1 ) 83 - 83 2014.3

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28aTE-1 Digital feedback system for active spin maser

Kojima S., Sato T., Ichikawa Y., Ohtomo Y., Sakamoto Y., Suzuki T., Shirai H., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Bidinosti C. P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 69 ( 1 ) 83 - 83 2014.3

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Construction and performance check of improved magnetic field stabilization system for EDM measurement 2

Sakamoto Y., Bidinosti C.P., Ichikawa Y., Sato T., Ohtomo Y., Suzuki T., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Inoue T., Furukawa T., Yoshimi A., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 68 ( 2 ) 84 - 84 2013.8

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Polarization and Relaxation processes of ^<129>Xe/^3He

Ohtomo Y., Ichikawa Y., Sato T., Sakamoto Y., Suzuki T., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Bidinosti C.P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 68 ( 2 ) 83 - 83 2013.8

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Experimental search for EDM in ^<129>Xe atom using ^3He comagnetometer II

Ichikawa Y., Sato T., Ohtomo Y., Sakamoto Y., Suzuki T., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Bidinosti C.P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 68 ( 2 ) 83 - 83 2013.8

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^3He co-magnetometer in double cell

Sato T., Ichikawa Y., Ohtomo Y., Sakamoto Y., Suzuki T., Chikamori M., Hikota E., Miyatake H., Nanao T., Suzuki K., Tsuchiya M., Inoue T., Furukawa T., Yoshimi A., Bidinosti C.P., Ino T., Ueno H., Matsuo Y., Fukuyama T., Asahi K.

Meeting abstracts of the Physical Society of Japan 68 ( 2 ) 83 - 83 2013.8

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27pHB-4 Development of electric-field applying system for the measurement of EDM in ^<129>Xe atom

Suzuki Takahiro, Ichikawa Yuichi, Chikamori Masatoshi, Ohtomo Yuichi, Hikota Eri, Sakamoto Yu, Bidinosti Chris, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Suzuki Kunifumi, Nanao Tsubasa, Miyatake Hirokazu, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Ueno Hideki, Matsuo Yukari, Fukuyama Takeshi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 91 - 91 2013.3

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27pHB-3 Nuclear spin maser oscillation with double cell

Hikota Eri, Chikamori Masatoshi, Ichikawa Yuichi, Ohtomo Yuichi, Sakamoto Yu, Suzuki Takahiro, Bidinosti Chris, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Suzuki Kunifumi, Nanao Tsubasa, Miyatake Hirokazu, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Ueno Hideki, Matsuo Yukari, Fukuyama Takeshi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 90 - 90 2013.3

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27pHB-2 Production and relaxation of polarization in ^<129>Xe/^3He cell

Ohtomo Yuichi, Ichikawa Yuichi, Chikamori Masatoshi, Hikota Eri, Sakamoto Yu, Suzuki Takahiro, Bidinosti Chris, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Suzuki Kunifumi, Nanao Tsubasa, Miyatake Hirokazu, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Ueno Hideki, Matsuo Yukari, Fukuyama Takeshi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 90 - 90 2013.3

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27pHB-5 Experiment searching of EDM in ^<129>Xe atom using ^3He comagnetometer

Chikamori Masatoshi, Ichikawa Yuichi, Ohtomo Yuichi, Hikota Eri, Sakamoto Yu, Suzuki Takahiro, Bidinosti Chris, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Suzuki Kunifumi, Nanao Tsubasa, Miyatake Hirokazu, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Ueno Hideki, Matsuo Yukari, Fukuyama Takeshi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 91 - 91 2013.3

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26aHA-13 Development of adiabatic field rotation system to measure a spin polarization of unstable nuclei

Ishibashi Y., Yoshida N., Ueno H., Yoshimi A., Ichikawa Y., Abe Y., Asahi K., Chikamori M., Fujita T., Furukawa T., Hikota E., Nagae D., Ohtomo Y., Saito Y., Shirai H., Suzuki T., Yang X. F.

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 72 - 72 2013.3

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29pHC-5 Can exchange force of two pions bind deuteron?

Oshima Sachiko, Fujita Takehisa, Yoshimi Akihiro

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 68 - 68 2013.3

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27pHB-1 Performance test of ^3He co-magnetometer for the measurement of atomic EDM in ^<129>Xe

Ichikawa Yuichi, Chikamori Masatoshi, Ohtomo Yuichi, Hikota Eri, Sakamoto Yu, Suzuki Takahiro, Bidinosti Chris, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Suzuki Kunifumi, Nanao Tsubasa, Miyatake Hirokazu, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Ueno Hideki, Matsuo Yukari, Fukuyama Takeshi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 68 ( 1 ) 90 - 90 2013.3

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27pEB-7 Simultaneous measurement of superradiance from competitive transitions in atomic helium using EUV-FEL

Nakajima K, Ohae C, Sasao N, Shigemasa E, Takahashi H, Tanaka M, Tang J, Uetake S, Wakabayashi T, Yoshimi A, Yoshimura M, Fukumi A, Iwayama H, Kawaguchi K, Kuma S, Miyamoto Y, Nakano I, Nakashima Y, Nanjyo H

Meeting Abstracts of the Physical Society of Japan 68 ( 0 ) 158 - 158 2013

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Spectroscopy for production of macro-coherence in metastable Xe

Yoshimi A, Tang J, Fukumi A, Tanaka M, Nakano I, Wakabayashi T, Yoshimura K, Yoshimura M, Sasao N, Uetake S, Kuma S, Nakajima K, Ohae C, Miyamoto Y, Kawaguchi K, Tsutsumi Y

Meeting Abstracts of the Physical Society of Japan 68 ( 0 ) 16 - 16 2013

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13pSC-2 Development of ^3He comagnetometer toward the experiment searching an atomic EDM in ^<129>Xe

Chikamori Masatoshi, Ichikawa Yuichi, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Ohtomo Yuichi, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 67 ( 2 ) 82 - 82 2012.8

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13pSC-1 Production of nuclear-spin polarization in ^3He and measurement of its relaxation time in anticipation of ^3He co-magnetometer

Ohtomo Yuichi, Chikamori Masatoshi, Ichikawa Yuichi, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 67 ( 2 ) 82 - 82 2012.8

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13pSC-3 Development of EDM measurement system employing ^<129>Xe nuclear-spin maser with ^3He co-magnetometer

Ichikawa Yuichi, Chikamori Masatoshi, Inoue Takeshi, Furukawa Takeshi, Yoshimi Akihiro, Ohtomo Yuichi, Tsuchiya Masato, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 67 ( 2 ) 82 - 82 2012.8

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25pXD-2 Frequency character of active spin maser II

Inoue Takeshi, Nanao Tsubasa, Chikamori Masatoshi, Miyatake Hirokazu, Furukawa Takeshi, Yoshimi Akihiro, Ichikawa Yuichi, Hayashi Hironori, Tsuchiya Masato, Ishii Yuji, Yoshida Naoki, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 101 - 101 2012.3

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25pXD-9 Development of atomic magnetometer based on NMOR for an EDM experiment

Nanao Tsubasa, Inoue Takeshi, Chikamori Masatoshi, Miyatake Hirokazu, Yoshimi Akihiro, Furukawa Takeshi, Ichikawa Yuichi, Hayashi Hironori, Tsuchiya Masato, Ishii Yuji, Yoshida Naoki, Shirai Hazuki, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 102 - 102 2012.3

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25pXD-1 Production of ^3He Polarization for a ^3He co-magnetometer

Miyatake Hirokazu, Inoue Takeshi, Chikamori Masatoshi, Nanao Tsubasa, Yoshimi Akihiro, Furukawa Takeshi, Ichikawa Yuichi, Hayashi Hironori, Tsuchiya Masato, Ishii Yuji, Yoshida Naoki, Shirai Hazuki, Ino Takashi, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 100 - 100 2012.3

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27pAB-7 Simultaneous measurement of superradiance from competitive transitions in atomic rubidium

Nakajima K., Fukumi A., Kuma S., Nakano I., Nakashima Y., Nanjyo H., Ohae C., Sasao N., Takahashi H., Uetake S., Yamaguchi T., Yoshimi A., Yoshimura M., Yuasa K.

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 241 - 241 2012.3

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24aXD-14 Contribution of the Solar neutrino to the Heat of the Earth

Oshima Sachiko, Fujita Takehisa, Yoshimi Akihiro

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 46 - 46 2012.3

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25pAD-3 Two-photon paired superradiance experiment using solid parahydrogen

Kuma S, Nakano I, Nanjo H, Fukumi A, Momose T, Yamaguchi T, Yuasa K, Yoshimi A, Yoshimura M, Wakabayashi T, Miyamoto Y, Nakajima K, Uetake S, Ohae C, Kawaguchi K, Sasao N, Tanaka M, Tang J

Meeting Abstracts of the Physical Society of Japan 67 ( 0 ) 207 - 207 2012

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27pAB-5 Emission Spectra of Bi and Yb Atoms in Solid Neon Matrices

Wakabayashi T, Sasao N, Tanaka M, Tang J, Nakano I, Nanjo H, Fukumi A, Momose T, Yoshimi A, Yoshimura M, Tomioka M, Yamaguchi T, Kuma S, Miyamoto Y, Nakajima K, Uetake S, Oae C, Kawaguchi K

Meeting Abstracts of the Physical Society of Japan 67 ( 0 ) 240 - 240 2012

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27pAB-6 窒素内包フラーレンN@C_<60>の真空紫外分光(27pAB 原子分子(原子分子一般),領域1(原子・分子,量子エレクトロニクス,放射線物理))

山口琢也, 福見敦, 湯浅一生, 吉見彰洋, 吉村太彦, 若林知成, 植竹智, 大饗千彰, 久間晋, 笹尾登, 田中実, 中嶋享, 中野逸夫, 南條創

日本物理学会講演概要集 67 ( 0 ) 240 - 240 2012

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中性子電気双極子モーメント測定実験のための高密度超冷中性子輸送法の開発

北口雅暁, 吉岡瑞樹, 清水裕彦, 有本靖, 竹谷薫, 猪野隆, 武藤豪, 岩下芳久, 今城想平, 三島賢二, 神谷好郎, 山下了, 関義親, 旭耕一郎, 吉見彰洋, 嶋達志

日本物理学会講演概要集 67 ( 1 ) 2012

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高密度パルス超冷中性子輸送法の開発

北口雅暁, 吉岡瑞樹, 三島賢二, 有本靖, 竹谷薫, 猪野隆, 武藤豪, 清水裕彦, 岩下芳久, 今城想平, 神谷好郎, 山下了, 旭耕一郎, 吉見彰洋, 嶋達志

京都大学原子炉実験所学術講演会報文集 46th 2012

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16aSK-11 Development of a new data acquisition system for β-NMR measurements

Yoshida N., Yoshimi A., Ueno H., Ichikawa Y., Ishii Y., Inoue T., Tsuchiya M., Hayashi H., Nanao T., Chikamori M., Uchida M., Asahi K.

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 65 - 65 2011.8

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18aSK-7 Frequency character of active spin maser

Inoue Takeshi, Nanao Tsubasa, Furukawa Takeshi, Chikamori Masatoshi, Yoshimi Akihiro, Hayashi Hironori, Tsuchiya Masato, Ishii Yuji, Yoshida Naoki, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 86 - 86 2011.8

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18aSK-6 Construction of environmental magnetic field stabilization system for an EDM experiment

Nanao Tsubasa, Furukawa Takeshi, Inoue Takeshi, Chikamori Masatoshi, Yoshimi Akihiro, Tsuchiya Masato, Hayashi Hironori, Ishii Yuji, Yoshida Naoki, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 86 - 86 2011.8

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18aSK-8 Development of Xe cell for an experiment searching for an atomic electric dipole moment in ^<129>Xe

Chikamori M., Inoue T., Nanao T., Furukawa T., Yoshimi A., Tsuchiya M., Hayashi H., Ishii Y., Yoshida N., Uchida M., Asahi K.

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 86 - 86 2011.8

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17aSZ-7 Future plan of nuclear physics for fundamental physics

Kitaguchi M., Ogawa I., Mibe T., Hori M., Yoshimi A., Kishimoto T.

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 76 - 76 2011.8

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18pSK-1 Production of spin-aligned RI beam using two-step fragmentation reaction with dispersion matching III

Ichikawa Y., Ueno H., Ishii Y., Furukawa T., Yoshimi A., Kameda D., Watanabe H., Aoi N., Asahi K., Balabanski D. L., Chevrier R., Daugas J. M., Fukuda N., Georgiev G., Hayashi H., Iijima H., Inabe N., Inoue T., Kubo T., Nanao T., Ohnishi T., Suzuki K., Tsuchiya M., Takeda H., Rajabali M. M., Ishihara M.

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 88 - 88 2011.8

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28pGK-3 Rotation system of magnetic field for the measurement of magnetic moments for neutron-rich isotopes ^<41,43>S

Iijima H., Yoshimi A., Ichikawa Y., Ishii Y., Yoshida N., Furukawa T., Uchida M., Suzuki K., Inoue T., Tsuchiya M., Hayashi H., Nanao T., Chikamori M., Ueno H., Asahi K.

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 99 - 99 2011.3

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27pGJ-10 Measurement of a nuclear magnetic moment of ^<32m>Al with TDPAD II

Ishii Y., Ichikawa Y., Ueno H., Furukawa T., Yoshimi A., Kameda D., Watanabe H., Aoi N., Asahi K., Balabanski D. L., Chevrier R., Daugas J. M., Fukuda N., Georgiev G., Hayashi H., Iijima H., Inabe N., Inoue T., Ishihara M., Kubo T., Nanao T., Ohnishi T., Suzuki K., Tsuchiya M., Takeda H., Rajabali M.

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 94 - 94 2011.3

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28pGK-1 Frequency characteristics of a nuclear spin maser

Inoue T., Furukawa T., Nanao T., Suzuki K., Chikamori M., Yoshimi A., Tsuchiya M., Hayashi H., Uchida M., Asahi K.

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 99 - 99 2011.3

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27pGJ-9 Production of spin-aligned RI beam using two-step fragmentation reaction with dispersion matching II

Ichikawa Y., Ueno H., Ishii Y., Furukawa T., Yoshimi A., Kameda D., Watanabe H., Aoi N., Asahi K., Balabanski D. L., Chevrier R., Daugas J. M., Fukuda N., Georgiev G., Hayashi H., Iijima H., Inabe N., Inoue T., Ishihara M., Kubo T., Nanao T., Ohnishi T., Suzuki K., Tsuchiya M., Takeda H., Rajabali M.

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 94 - 94 2011.3

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28aGJ-13 Structure of N=21 neutron-rich nucleus ^<35>Si

Imai N., Hirayama Y., Watanabe Y. X., Teranishi T., Hashimoto T., Hayakawa S., Ichikawa Y., Ishiyama H., Jeong S. C., Kahl D., Kubono S., Miyatake H., Ueno H., Yamaguchi H., Yoneda K., Yoshimi A.

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 63 - 63 2011.3

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25aGJ-9 Nuclear moments of extremely proton-rich nucleus ^<23>Al

Nagatomo T., Ueno H., Mihara M., Matsuta K., Yoshimi A., Ichikawa Y., Yamada K., Kawamura H., Ozawa A., Moriguchi T., Ishibashi Y., Asahi K., Uchida M., Suzuki K., Inoue T., Hasama Y., Iijima Y., Sumikama T., Fukuda M., Minamisono T.

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 43 - 43 2011.3

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中性子電気双極子モーメント測定実験のための高密度超冷中性子輸送法の開発

北口雅暁, 吉岡瑞樹, 三島賢二, 有本靖, 竹谷薫, 猪野隆, 武藤豪, 清水裕彦, 岩下芳久, 今城想平, 神谷好朗, 山下了, 旭耕一郎, 吉見彰洋, 嶋達志

日本物理学会講演概要集 66 ( 1 ) 2011

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中性子電気双極子モーメント測定実験のための高密度超冷中性子輸送法の開発 II

北口雅暁, 吉岡瑞樹, 三島賢二, 有本靖, 竹谷薫, 猪野隆, 武藤豪, 清水裕彦, 岩下芳久, 今城想平, 神谷好朗, 山下了, 旭耕一郎, 吉見彰洋, 嶋達志

日本物理学会講演概要集 66 ( 2 ) 2011

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12aSB-12 Production of spin-aligned RI beam using two-step fragmentation reaction with dispersion matching

Ichikawa Y., Ueno H., Ishii Y., Furukawa T., Yoshimi A., Kameda D., Aoi N., Watanabe H., Asahi K., Iijima H., Suzuki K., Inoue T., Tsuchiya M., Hayashi H., Nanao T., Kubo T., Inabe N., Ohnishi T., Takeda H., Fukuda N., Daugas J. M., Chevrier R., Georgiev G., Rajabali M., Balabanski D. L.

Meeting abstracts of the Physical Society of Japan 65 ( 2 ) 34 - 34 2010.8

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12aSE-1 Development of highly-seinsitive magnetometer based on NMOR for an EDM experiment

Nanao Tsubasa, Yoshimi Akihiro, Inoue Takeshi, Furukawa Takeshi, Tsuchiya Masato, Hayashi Hironori, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 65 ( 2 ) 63 - 63 2010.8

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12aSB-11 Measurement of a nuclear magnetic moment of ^<32m>Al with TDPAD

Ishii Y., Ichikawa Y., Ueno H., Furukawa T., Yoshimi A., Kameda D., Aoi N., Watanabe H., Asahi K., Iijima H., Suzuki K., Inoue T., Tsuchiya M., Hayashi H., Nanao T., Kubo T., Inabe N., Ohnishi T., Takeda H., Fukuda N., Daugas J. M., Chevrier R., Georgiev G., Rajabali M., Balabanski D. L.

Meeting abstracts of the Physical Society of Japan 65 ( 2 ) 33 - 33 2010.8

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12aSE-2 Measurement of ^<129>Xe nuclear spin polarization for an EDM search experiment

Tsuchiya Masato, Inoue Takeshi, Hayashi Hironori, Nanao Tsubasa, Furukawa Takeshi, Yoshimi Akihiro, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 65 ( 2 ) 64 - 64 2010.8

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20pHT-8 Observation of iron impurities in silicon under external stress by in-beam Mossbauer spectroscopy

Suzuki K., Yoshida Y., Kobayashi Y., Ueno H., Ukihira K., Hayakawa K., Mihara M., Sato W., Yoshimi A., Nagatomo T., Ichikawa Y., Furukawa T., Inoue T., Hasama Y., Iijima H., Tsuchiya M., Hayashi H., Ishii Y., Nanao T., Asahi K.

Meeting abstracts of the Physical Society of Japan 65 ( 1 ) 979 - 979 2010.3

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23aBS-8 Measurement of ^<129>Xe nuclear spin polarization to search for an atomic EDM

Tsuchiya Masato, Inoue Takeshi, Hayashi Hironori, Nanao Tsubasa, Furukawa Takeshi, Yoshimi Akihiro, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 65 ( 1 ) 98 - 98 2010.3

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23aBS-9 Stabilization of magnetic field strength for the measurement of the electric dipole moment in diamagnetic ^<129>Xe atoms

Furukawa T., Inoue T., Nanao T., Yoshimi A., Tsuchiya M., Hayashi H., Uchida M., Asahi K.

Meeting abstracts of the Physical Society of Japan 65 ( 1 ) 98 - 98 2010.3

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23aBS-10 Simulation of the frequency analysis in the EDM experiment

Hayashi Hironori, Inoue Takeshi, Furukawa Takeshi, Tsuchiya Masato, Nanao Tsubasa, Yoshimi Akihiro, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 65 ( 1 ) 98 - 98 2010.3

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23aBS-11 Development of Rb atomic magnetometer with Nonlinear Magneto Optical Effect

Yoshimi A., Nanao T., Inoue T., Furukawa T., Tsuchiya M., Hayashi H., Uchida M., Asahi K.

Meeting abstracts of the Physical Society of Japan 65 ( 1 ) 99 - 99 2010.3

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23aBS-7 Improvement of the optical pumping efficiency in ^<129>Xe nuclear spin maser

Inoue Takeshi, Furukawa Takeshi, Hayashi Hironori, Tsuchiya Masato, Nanao Tsubasa, Yoshimi Akihiro, Uchida Makoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 65 ( 1 ) 98 - 98 2010.3

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21pSB-7 Electric quadrupole moment of ^<33>Al

Shimada K., Nagatomo T., Asahi S., Balabanski D.L., Daugas J.M., Depuydt M., Rydt M. De, Gaudefroy L., Grevy S., Hasama Y., Ichikawa Y., Kameda D., Morel P., Perrot L., Stodel Ch., Thomas J.C., Vanderheyolen W., Vermeulen N., Vingerhoets P., Yoshimi A., Neyens G., Ueno H.

Meeting abstracts of the Physical Society of Japan 63 ( 2 ) 38 - 38 2008.8

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22aSD-6 The development of ^<129>Xe nuclear spin maser for atomic EDM measurement

Inoue Takeshi, Yoshimi Akihiro, Uchida Makoto, Hatakeyama Naoto, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 63 ( 2 ) 65 - 65 2008.8

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23aZH-6 g-Factor measurement of the isomeric state of ^<32>AI and the shell structure

Kameda D., Takase K., Ueno H., Yoshimi A., Nagatomo T., Hasama Y., Watanabe H., Hatakeyama N., Inoue T., Kagami S., Suzuki K., Nakano C., Kawamura H., Toyoda T., Narita K., Murata J., Nagae D., Uchida M., Shimada K., Asahi K.

Meeting abstracts of the Physical Society of Japan 63 ( 1 ) 68 - 68 2008.2

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28aSE-10 Measurement of electric quadrupole moment of ^<31>Al

Nagae D., Ueno H., Kameda D., Takemura M., Asahi K., Takase K., Yoshimi A., Sugimoto T., Nagatomo T., Uchida M., Shimad K., Arai T., Inoue T., Kagami S., Hatakeyama N., Kawamura H., Narita K.

Meeting abstracts of the Physical Society of Japan 62 ( 1 ) 88 - 88 2007.2

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28aSE-11 Measurements of electromagnetic moments of neutron-rich ^<32>Al : Boundary of the "Island of Inversion"

Kameda D., Ueno H., Asahi K., Takemura M., Yoshimi A., Haseyama T., Uchida M., Shimada K., Nagae D., Kijima G., Arai T., Takase K., Suda S., Inoue T., Murata J., Kawamura H., Kobayashi Y., Watanabe H., Ishihara M.

Meeting abstracts of the Physical Society of Japan 62 ( 1 ) 88 - 88 2007.2

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28aSE-7 Production of polarized radioactive beams via the inverse-kinematics reactions and their application

Shimada K., Nagae D., Asahi K., Arai T., Takemura M., Inoue T., Takase K., Kagami S., Hatakeyama N., Kobayashi Y., Ueno H., Yoshimi A., Kameda D., Nagatomo T., Sugimoto T., Kubono S., Yamaguchi H., Wakabayashi Y., Guilherme Amadio, Hayakawa S., Murata J., Kawamura H.

Meeting abstracts of the Physical Society of Japan 62 ( 1 ) 87 - 87 2007.2

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28aSE-8 Development of the new atomic-beam resonance method for production of polarized radio isotopes

Sugimoto Takashi, Yoshimi Akihiro, Ueno Hideki, Murata Jiro, Kawamura Hirokazu, Nagae Daisuke, Shimada Kenzi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 62 ( 1 ) 87 - 87 2007.2

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30aWF-11 Hyperfine field at ^<17>N nucleus implanted in diamond

Arai Takamasa, Uchida Makoto, Ueno Hideki, Kameda Daisuke, Takemura Makoto, Yoshimi Akihiro, Haseyama Tomohito, Shimada Kenzi, Nagae Daisuke, Suda Shinichi, Inoue Takeshi, Takase Kenichi, Asahi Koichiro

Meeting abstracts of the Physical Society of Japan 61 ( 1 ) 77 - 77 2006.3

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30aWF-10 Electric Quadrupole Moment of Neuton-rich Nucleus ^<32>Al

Takemura Makoto, Asahi Koichiro, Uchida Makoto, Kameda Daisuke, Ueno Hideki, Kijima Go, Yoshimi Akihiro, Shimada Kenji, Nagae Daisuke, Haseyama Tomohito, Arai Takamasa, Suda Shinichi, Inoue Takeshi, Takase Kenichi, Kawamura Hirokazu, Murata Jiro

Meeting abstracts of the Physical Society of Japan 61 ( 1 ) 76 - 76 2006.3

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Measurement of nuclear moments in the region of light neutron-rich nuclei

H Ueno, K Asahi, H Ogawa, D Kameda, H Miyoshi, A Yoshimi, H Watanabe, K Shimada, W Sato, K Yoneda, N Imai, Y Kobayashi, M Ishihara, WD Schmidt-Ott

NUCLEAR PHYSICS A 738 211 - 215 2004.6

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Spin-polarized radio active-isotope beams developed at RIKEN offer us the opportunity of studying structures of nuclei far from the stability line through the measurement of electromagnetic moments. The effects of the neutron excess on the structure are discussed through the systemic measurements of the mu-moments of nitrogen isotopes and the Q-moments of boron isotopes. We also applied the result of mu-moment measurements for C-17 to the spin-parity assignment of its ground state.

DOI： 10.1016/j.nuclphysa.2004.04.033

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^<129>Xe nuclear spin maser and search for atomic EDM

Yoshimi Akihiro

Meeting abstracts of the Physical Society of Japan 58 ( 2 ) 55 - 55 2003.8

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28aSC-12 不安定核を対象とした低エネルギー偏極ビーム生成装置の開発 (II)

島田健司, 旭耕一郎, 伊藤孝, 上野秀樹, 貝原星宇, 亀田大輔, 小林義男, 佐藤渉, 須田慎一, 三好永哲, 村田次郎, 吉見彰洋, 渡邉寛

日本物理学会講演概要集 58 ( 1 ) 60 - 60 2003.3

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28aSC-11 不安定核を対象とした低エネルギー偏極ビーム生成装置の開発 (I)

三好永哲, 村田次郎, 旭耕一郎, 上野秀樹, 吉見彰洋, 渡邉寛, 亀田大輔, 貝原星宇, 島田健司, 佐藤渉, 須田慎一, 伊藤孝, 小林義男

日本物理学会講演概要集 58 ( 1 ) 59 - 59 2003.3

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Measurements of Spin Polarization of ^<19>C and ^<19>N

Kameda D., Asahi K., Ueno H., Yoshimi A., Miyoshi H., Murata J., Watanabe H., Sato W., Kobayashi Y., Kaihara J., Shimada K., Suda S., Ito T.

Meeting abstracts of the Physical Society of Japan 58 ( 1 ) 46 - 46 2003.3

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Electromagnetic moments of neutron-rich nuclei measured with polarized radioactive ion beams

K Asahi, K Sakai, H Ogawa, H Miyoshi, K Yogo, A Goto, T Suga, H Ueno, Y Kobayashi, A Yoshimi, A Yoshida, T Kubo, YX Watanabe, H Imai, K Yoneda, N Fukuda, N Aoi, M Ishihara, WD Schmidt-Ott, G Neyens, S Teughels

NUCLEAR PHYSICS A 704 88C - 97C 2002.6

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By taking advantage of spin polarized radioactive nuclear beams from projectile fragmentation, combined with the beta-detected nuclear magnetic resonance technique, the magnetic dipole and the electric quadrupole moments were measured for a number of nuclei in the light, neutron-rich region. The obtained results show some intriguing systematical features which become apparent when compared with standard shell-model calculations, and thus seem to shed new light on the structure and interactions of nuclei in this region.

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27pWF-5 ^<149>Dy高スピン核異性体のg-factorの測定

渡辺寛, 上野秀樹, 佐藤渉, 吉見彰洋, 亀田大輔, 岸田隆, 小林義男, 三好永哲, 小田原厚子, 郷農靖之, 旭耕一郎

日本物理学会講演概要集 57 ( 1 ) 61 - 61 2002.3

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On-line TDPAC studies with the ^<19>O beam

Sato W., Ueno H., Watanabe H., Ogawa H., Miyoshi H., Imai N., Yoshimi A., Yoneda K., Kameda D., Kobayashi Y., Asahi K.

Meeting abstracts of the Physical Society of Japan 56 ( 2 ) 829 - 829 2001.9

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Nuclear spin maser with an external feedback system and its application

Yoshimi A., Asahi K.

Meeting abstracts of the Physical Society of Japan 56 ( 2 ) 114 - 114 2001.9

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Optical detection of nuclear spin precession for the observation of nuclear Casimir effect in ^<131>Xe

Yogo K., Yoshimi A., Sato K., Sakai K., Asahi K.

Meeting abstracts of the Physical Society of Japan 56 ( 1 ) 94 - 94 2001.3

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Development of an adiabatic field rotation method for the polarization measurement of a fragment beam

Kameda D., Asahi K., Ogawa H., Ueno H., Miyoshl H., Yoneda K., Watanabe H., Imai N., Suga T., Ohno K., Sato W., Yoshmi A., Yogo K., Sakai K., Kobayashi Y., Yoshida A., Kubo T., Ishihara M.

Meeting abstracts of the Physical Society of Japan 56 ( 1 ) 43 - 43 2001.3

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Measurement of magnetic moment of neutron rich isotope ^<17>C and ground-state spin

Miyoshi H., Asahi K., Ogawa H., Ueno H., Kameda D., Yoneda K., Watanabe H., Imai N., Suga T., Ohno K., Sato W., Yoshimi A., Yogo K., Sakai K., Kobayashi Y., Yoshida A., Kubo T., Ishihara M.

Meeting abstracts of the Physical Society of Japan 56 ( 1 ) 43 - 43 2001.3

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核スピンメーザーの中性子への応用--中性子EDM探索実験の新しい手法 (中性子基礎物理研究会) -- (Session 1:研究の現状と興味ある科学)

吉見彰洋, 旭耕一郎, 酒井健二

KURRI-KR ( 67 ) 18 - 25 2000.8

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Cross polarization effect on LMR of ^<18>N implanted in Mg stopper

Yogo K., Ogawa H., Sakai K., Yoshimi A., Suzuki T., Nagakura M., Goto A., Suga T., Asahi K.

Meeting abstracts of the Physical Society of Japan 55 ( 1 ) 37 - 37 2000.3

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Electric quadrupole moment of neutron halo nucleus ^<17>B

Suzuki T., Ogawa H., Asahi K., Miyoshi H., Nagakura M., Goto A., Suga T., Yogo K., Honda T., Sakai K., Yoshimi A., Ueno H., Imai N., Yoneda K., Fukuda N., Watanabe Y. X., Aoi N., Kobayashi Y., Yoshida A., Kubo T., Sakurai H., Schmidt-Ott W. -D., Neyens G., Teughels S.

Meeting abstracts of the Physical Society of Japan 55 ( 1 ) 36 - 36 2000.3

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Measurement of ^<15>C magnetic moment

Ogawa H., Asahi K., Nagakura M., Suzuki T., Goto A., Suga T., Yogo K., Miyoshi H., Honda T., Sakai K., Yoshimi A., Ueno H., Watanabe Y. X., Imai N., Yoneda K., Fukuda N., Aoi N., Kobayashi Y., Yoshida A., Kubo T., Sakurai H., Schmidt-Ott W. -D., Neyens G., Teughels S.

Meeting abstracts of the Physical Society of Japan 55 ( 1 ) 36 - 36 2000.3

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24pSC-10 The characteristic od ^<129>Xe unclear spin maser

YOSHIMI A, ASAHI K, SAKAI K, OGAWA H, SUZUKI T, NAGAKURA M, SUGA T, GOTO A, YOGO K

Meeting abstracts of the Physical Society of Japan 54 ( 2 ) 55 - 55 1999.9

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29a-PS-123 Development of <129>^Xe nuclear spin maser for measuring atomic EDM III

Yoshimi A., Asahi K., Sakai K., Ogawa H., Uchiyama Y., Mizumura Y., Suzuki T., Nagakura M.

Meeting abstracts of the Physical Society of Japan 54 ( 1 ) 60 - 60 1999.3

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24pSC-4 Experimental test of Neturon Deceleration for Sisyphus UCN production

SAKAI K, YOGO K, SUGA T, UTSURO M, OKUMURA K, HINO M, ASAHI K, UCHIYAMA Y, SUZUKI T, NAGAKURA M, GOTO A, OGAWA H, YOSHIMI Y, MIZUMURA Y

Meeting Abstracts of the Physical Society of Japan 54 ( 0 ) 54 - 54 1999

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DOI： 10.11316/jpsgaiyo.54.2.1.0_54_3

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24pSC-5 Energy Distribution of the KENS VCN Beam for Development of Sisyphus Deceleration Method of UCN Production

GOTO A, UTSURO M, HINO M, SAKAI K, SUZUKI T, YOGO K, ASAHI K, OGAWA H, YOSHIMI A, NAGAKURA M, SUGA T

Meeting Abstracts of the Physical Society of Japan 54 ( 0 ) 54 - 54 1999

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DOI： 10.11316/jpsgaiyo.54.2.1.0_54_4

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Development of polarized ^<129>Xesolid for polarizing unstable nuclei

SAKAI K., MIZUMURA Y., SUZUKI T., ASAHI K., OGAWA H., YOSHIMI A., UCHIYAMA Y., NAGAKURA M., SATO H.

Meeting abstracts of the Physical Society of Japan 53 ( 2 ) 58 - 58 1998.9

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Development of ^<129>Xe nuclear spin maser for measuring atomic EDM II

YOSHIMI A., ASAHI K., SAKAI K., OGAWA H., UCHIYAMA Y., MIZUMURA Y., SUZUKI T., NAGAKURA M.

Meeting abstracts of the Physical Society of Japan 53 ( 2 ) 59 - 59 1998.9

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Magnetic moments of ^<17>N and ^<17>B and the structure of light neutron-rich nuclei

UENO H., ASAHI K., IZUMI H., NAGATA K., OGAWA H., YOSHIMI A., SATO H., ADACHI M., HORI Y., MOCHINAGA K., OKUNO H., AOI N., ISHIHARA M., YOSHIDA A., LIU G., KUBO T., FUKUNISHI N., SHIMODA T., MIYATAKE H., MITSUOKA S., SASAKI M., SHIRAKURA T., TAKAHASHI N., SCHMIDT-OTT W.D.

Meeting abstracts of the Physical Society of Japan 53 ( 1 ) 46 - 47 1998.3

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Development of polarized He-3 gas system as a spin analyzer for low energy neutrons

K Sakai, H Sato, A Yoshimi, K Asahi, Y Masuda, S Muto, S Ishimoto, K Morimoto, A Masaike, M Iinuma, Y Matsuda, K Okumura, T Haseyama

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 402 ( 2-3 ) 244 - 246 1998.1

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For use as a spin analyzer for low energy neutrons, a polarized He-3 gas system was developed at KEK. The polarization attained of He-3 at 3 atm determined as P-He = 40%, through the measurement of the transmission of unpolarized neutrons through the He-3 fell. The He-3 cell was used in the measurement of P-violating spin rotation of neutrons in the 0.734 eV p-wave resonance of the La-139+n system. As a result, a parity mixing matrix element xW = 1.04 +/- 0.40 meV was obtained. which is in agreement with the s- and p-wave resonance mixing model. An attempt is under way to improve the performance of the spin analyzer, by increasing the He-3 pressure and incorporating high-power diode lasers. So far we have obtained P-He = 12% at 20 atm.

DOI： 10.1016/S0168-9002(97)00843-7

Web of Science

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21p-D-3 Measurement of ^<18>N magnetic moment and electric quadrupole moment

Ogawa H., Asahi K., Sakai K., Yoshimi A., Tsuda M., Uchiyama Y., Suzuki T., Suzuki K., Kurokawa N., Adachi M., Isumi H., Ueno H., Shimoda T., Tanimoto S., Takahashi N., Schmidt-Ott W.-D., Schafer M., Fukuda S., Yoshida A., Kubo T., Okuno H., Sato H., Notani M., Aoi N., Yoneda K., Iwasaki H., Fukuda N., Ishihara M., Miyatake H.

Meeting abstracts of the Physical Society of Japan 52 ( 2 ) 57 - 57 1997.9

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6a-H-6 Development of ^<129>Xe polarized system with diode lasers

Tsuda Masaki, Sato Hiromi, Yoshimi Akihiro, Sakai Kenji, Adachi Minoru, Asahi Koichiro

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1996 ( 1 ) 109 - 109 1996.9

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6a-H-3 Study of Spin Control System of Epithermal Neutron to Investigate Violations of P and T

Sakai K., Yoshimi A., Sato H., Asahi K., Masuda Y., Moto S., Morimoto K., Ishimoto S., Adachi T., Matsuda Y., Okumura K.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1996 ( 1 ) 108 - 108 1996.9

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6a-H-2 Development of analysing technique of neutron spin with high pressure and high polarized ^3He

Yoshimi A., Sakai K., Sato H., Asahi K., Masuda Y., Muto S., Morimoto K., Ishimoto S., Matsuda Y., Okumura K.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1996 ( 1 ) 108 - 108 1996.9

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29a-SF-6 Precision measurement of magnetic moment of ^<21>F

Yoshimi A., Ueno H., Ogawa H., Asahi K., Sato H., Mochinaga K., Adachi M., Sakai K., Okuno H., Fukuda S., Wakasugi M., Yoshida A., Kubo T., Ozawa S., Gen K., Aoi N., Yoneda K., Ishihara M., Miyake H., Shimoda T., Takahashi N.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 1 ) 120 - 120 1995.9

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Presentations

X-ray Pumping of the Thorium-229 Nuclear Clock Isomer Invited

Akihiro Yoshimi

International Conference on the Applications of the Mössbauer Effect; ICAME2021 2021.9.8

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Event date： 2021.9.6 - 2021.9.10

Language：English Presentation type：Oral presentation (invited, special)

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Present status of spectroscopy for Th-229 nuclear clock transition with brilliant synchrotron radiation

Akihiro Yoshimi

2021.6.18

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Event date： 2021.6.18 - 2021.6.19

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崩壊現象における指数法則からのずれ - アルファ崩壊と人工原子 -

吉見彰洋

日本物理学会第76回年次大会 2021.3.15

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Event date： 2021.3.12 - 2021.3.15

Language：Japanese Presentation type：Oral presentation (general)

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Towards spectroscopy of 229Th nuclear isomeric transition using nuclear resonant scattering at SPring-8

A. Yoshimi

Expert Workshop on Nuclear Resonant Scattering of Synchrotron Radiation 2021.1.12

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Event date： 2021.1.12 - 2021.1.15

Language：English Presentation type：Oral presentation (general)

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229Th 原子核極低エネルギー準位と高精度原子核時計への応用 Invited

吉見彰洋

2019年度「物質階層原理研究」＆「ヘテロ界面研究」研究報告会 2020.2.5

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Event date： 2020.2.4 - 2020.2.5

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Th-229 極低アイソマー準位からの原⼦核時計遷移分光研究

吉見彰洋

東北⼤学⾦属材料研究所⼤洗・アルファ合同研究会 2023.9.29

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ニュートリノ研究のための超放射実験

吉見彰洋

日本物理学会第77回年次大会 2022.3.19

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ランタノイド系ドープ結晶を利用したニュートリノ質量分光

吉見彰洋

日本物理学会第77回年次大会 2022.3.15

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Towards the spectroscopy of 229Th nuclear clock transition using Nuclear Resonant Scattering International conference

Akihiro Yoshimi

DICP Workshop on Mossbauer Spectroscopy Related to Synchrotron Radiation and Free Electron Laser 2019.8.31

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Production of the 229Th nuclear clock isomer with brilliant X-ray International conference

Akihiro Yoshimi

International Nuclear Physics Conference 2019 (INPC2019) 2019.7.29

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Nuclear resonant scattering of 229Th for observation of radiative isomeric transition Invited International conference

Akihiro Yoshimi

WE-Heraeus-Seminar on “Novel optical clocks in atoms and nuclei” 2018.7.9

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229Th 極低アイソマー準位の分光に向けた核共鳴散乱実験の進展

吉見彰洋

第11回SPRUC核共鳴散乱研究会 2018.3

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Nuclear resonant scattering with high-brilliant X-ray for Thorium-229 isomer studies International conference

Akihiro Yoshimi

10th International Conference on Fundamental Physics Using Atoms 2018.1.8

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Nuclear resonant scattering experiment for observation of 229mTh radiative transition International conference

Akihiro Yoshimi

International Conference on Laser Spectroscopy (ICOLS 2017) 2017.7

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Neutrino spectroscopy with atoms and laser – toward detection of relic neutrino – Invited International conference

Akihiro Yoshimi

International Conference on Light driven Nuclear-Particle physics and Cosmology 2017 (LNPC2017) 2017.4.19

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New scheme of high-quality neutron source using intense MeV gamma beam from quantum ion

Akihiro Yoshimi

2nd workshop of Concepts of neutron sources (CoNS-II) 2017.3.7

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Towards neutrino mass spectroscopy using atoms: experimental status Invited International conference

Akihiro Yoshimi

the 4th Users Meeting of the Spanish Pulsed Lasers Center 2014.12.2

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Research Projects

ランタノイドイオン結晶のレーザー操作によるニュートリノ質量分光法の開発研究

Grant number：20H00161 2020.04 - 2024.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)

吉見彰洋, 吉村太彦, 黒澤俊介

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Grant amount：\41340000 （ Direct expense: \31800000 、 Indirect expense：\9540000 ）

初年度は、結晶中にドープされたランタノイドイオンの電子遷移に伴ってニュートリノ対を放出する際に発生する磁化について検討を行った。電子スピンの非対称な射影成分である磁化は、パリティ対称性を破る弱い相互作用を通じてのみ生成され得るもので、QED 過程のバックグランド事象と識別できる重要な量である。また、この発生磁化はスピン緩和時間程度の間、蓄積され続けて観測にかかるというメリットもある。理論的に検討を進めた結果、ニュートリノの性質(質量、粒子タイプ等)は磁化の角度分布に現れることが分かり、その量は磁場強度として nG/s のレートで発生すると期待できることが分かった。これは励起レーザーの照射デューティー比を考慮しても、SQUID のような高感度磁力計で検出可能な量である。
また、使用する結晶の候補の１つである Er:LiYF4 の準備に着手した。これは母結晶 LiYF4 の Y サイトを Er 原子で置換したもので価数は Er3+ が安定である。この結晶はフォノンエネルギーが低く、Er 電子のコヒーレンスやスピン状態が結晶格子との相互作用で緩和するレートが固体の中でもひと際小さいことが知られている。ただし本研究では、コヒーレンスの良い系を実現するために商用では扱われていない低濃度(0.1%以下)の Er が置換されているEr:LiYF4 結晶が必要であることから、分担者である東北大学の黒澤氏により、0.1%および 0.01% のEr濃度の結晶を作製した。X線回折パターンを測定して単結晶面の確認も行い、今後予定している結晶性能評価実験の準備が整った。

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Quantum control of Th-229 isomer for study of gamma-ray laser

Grant number：19K21879 2019.06 - 2021.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory) Grant-in-Aid for Challenging Research (Exploratory)

Yoshimi Akihiro

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Grant amount：\6500000 （ Direct expense: \5000000 、 Indirect expense：\1500000 ）

We tried excitation to the low-energy nuclear isomer of Th-229 doped in CaF2 crystal by using Synchrotron radiation X-ray. The luminescence spectrum from the Th:CaF2 induced by X-ray irradiation and radioactivity was measured, and the decreasing from ultraviolet to the vacuum ultraviolet region. We constructed a system to detect vacuum ultraviolet light from the isomer while suppressing the background, and paved the way for Th-229 isomer transition spectroscopy in CaF2.

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Highly spin-polarized RI beam and its application to nuclear physics and materials science

Grant number：18H05462 2018.06 - 2023.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

上野秀樹, 山崎展樹, 高峰愛子, 鄭旭光, 山本文子, 吉見彰洋

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Grant amount：\158340000 （ Direct expense: \121800000 、 Indirect expense：\36540000 ）

本研究では「超低速・高核スピン偏極」という新たな価値を付加した新奇量子ビームを実現すべく、RI原子線共鳴装置の開発を行う。更にβ線検出型超高感度NMR法(β-NMR法)による新たな物質科学研究を開拓するとともに、宇宙観測用ガンマ線検出器と組み合わせた核物理の展開も目指している。目的達成に向け、RIプローブの性質解明及び関連研究を推進する①核プローブ研究チーム、RI原子線共鳴装置の開発を担う②RI原子線発生系開発チーム及び③RIスピン選択系開発チーム、その利用を視野に入れ本研究で測定対象とする試料の合成と評価、及び核プローブの利用研究を進める④物質科学研究チーム、および、領域内横断的連携によりRIビームや結晶を利用した新たな研究を開拓する⑤領域横断研究チームの5チーム体制で研究を推進している。
2020年度は①と②について重点的に研究を行った。チーム①では、O-21核の電気四重極モーメントの精密測定に成功しデータ解析を経て最終的な実験値を決定した。現在成果の取りまとめと論文執筆に取り掛かっている。関連研究として、放医研HIMAC加速器施設を用い、核破砕反応におけるスピン整列RIビームを用いた新たな核電磁モーメント測定法の開発実験を実施し、良好な成果を得ることができた。また、核理論の関連研究でも多くの成果が得られた。②では、前年度構築したイオントラップ装置の開発を本格化し、オフライン開発用のRbイオン源を用いてイオントラップ効率を50%以上に向上させた。その次のステップとして中性化を行い、20%程度の中性化を確認・達成することができた。また、関連技術＆装置を一部利用したレーザー分光研究に関する開発研究の成果を取りまとめて論文発表した。③ではシミュレーションに基づく設計を、④では引き続きCuOおよび関連する物質の合成に関する研究を進めた他、核プローブを用いた関連研究も実施した。

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Study of atomic coherence for neutrino mass spectroscopy

Grant number：17H02896 2017.04 - 2021.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Grant-in-Aid for Scientific Research (B)

Yoshimi Akihiro

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Grant amount：\19110000 （ Direct expense: \14700000 、 Indirect expense：\4410000 ）

This study aims to detect the neutrinos emission associated with the atomic transition, and conducts experiments to control the excitation/coherence formation of atoms into a metastable state and the de-excitation process from them.
Using Xe as the target atom, we conducted a multiphoton excitation experiment with a pulse laser to the first excited state (a metastable state with a lifetime of about 40 seconds). As a result, we succeeded in exciting to the metastable state through E1-M1 and E1-E2 two-photon excitation. In addition, the probe laser beam was introduced and the number of excitations could be calculated to be 1e+6 to 1e+7 per pulse, reaching a stage where it can be compared with the theoretical transition intensity.
The ability to compare the theory and experiment of two-photon transitions involving such forbidden transitions is an important advance for coherence control.

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レーザー操作可能な原子核準位トリウム-229 極低アイソマー状態の直接観測

2016.10 - 2018.03

松尾学術財団松尾学術研究助成

吉見彰洋

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Authorship：Principal investigator Grant type：Competitive

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Experimental studies on generation mechanism of novel photon beams using heavy ions

Grant number：16H02136 2016.04 - 2020.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Kamigaito Osamu

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Grant amount：\42250000 （ Direct expense: \32500000 、 Indirect expense：\9750000 ）

研究成果の概要（英文）：This research was conducted with an aim to develop a method which generates photon beams (gamma-rays) with novel features rendered by heavy ions and/or quantum coherence. Actually, we carried out some basic studies with Ba ions as a first step toward a bright gamma-ray source. We confirmed that the measured resonant cross section and its width etc. basically agree with theoretical expectations, and pointed out several issues to be clarified in future. In addition to these experimental studies, we proposed new methods of generating gamma-rays with orbital angular momentum.

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Study on Thorium-229 low-lying isomeric state

Grant number：15H03661 2015.04 - 2018.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Yoshimura Koji, YAMAGUCHI Atsushi, SETO Makoto, Stellmer Simon

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Grant amount：\17030000 （ Direct expense: \13100000 、 Indirect expense：\3930000 ）

We searched for eV-order meta-stable isomeric excited state of Th-229, which is extraordinally low-lying for ordinary nuclei. We developed the new scheme using nuclear resonant scattering with high intense synchrotron radiation X-ray source, fast X-ray detection system, high performance targetry, and X-ray focusing system. We have successfully observed the precise signal from nuclear resonant scattering of nuclei with half life below 1 ns.

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EDM精密測定実験のための原子磁力計の開発研究

2012.04 - 2015.03

文部科学省科研費基盤研究(B)

吉見彰洋

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Authorship：Principal investigator Grant type：Competitive

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Electromagnetic nuclear moments around neutron magic number 20 and 28

Grant number：22340071 2010.04 - 2014.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

UENO Hideki, ASAHI Koichiro, ICHIKAWA Yuichi, YOSHIMI Akihiro

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Grant amount：\19500000 （ Direct expense: \15000000 、 Indirect expense：\4500000 ）

The purpose of this study is to investigate the structure of far neutron-rich nuclei around neutron magic number N = 20 and 28 through the measurement of electromagnetic nuclear moments. In the nuclear region of N = 20, a ground-state electric quadrupole (Q) moment of 33Al was measured at GANIL, France. The obtained Q shows a large outward discrepancy from a single particle value and shell model calculations within the conventional sd model space, suggesting the erosion of N = 20 shell closure. For the N = 28 region, the Q moment of the isomeric state of 43S at 320 keV was measured at the RIKEN RIBF facility. The data shows that the 43S deformation is modest in spite of the level inversion, suggesting a strong deformation of the ground state and a shape coexistence in the low-lying states. In this study, a noble method to produce spin-aligned RI beams utilizing two-step fragmentation reaction combined with momentum dispersion-matching of the ion optics technique has been developed.

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High-precision search for the atomic EDM by means of a novel nuclear spin maser scheme

Grant number：21104004 2009.07 - 2014.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

ASAHI Koichiro, UENO Hideki, MATSUO Yukari, FUKUYAMA Takeshi, YOSHIMI Akihiro, FURUKAWA Takeshi, UCHIDA Makoto, YABUSAKI Tsutomu, SAKEMI Yasuhiro, YOSHIMI Akihiro, FURUKAWA Takeshi

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Grant amount：\173420000 （ Direct expense: \133400000 、 Indirect expense：\40020000 ）

The present study aims at a high-precision search for the electric dipole moment (EDM) of 129Xe atom which, if finite, would provide a clear evidence for the presence of new physics beyond the standard model of elementary particles. To this end, an active feedback nuclear spin maser, of which the present research group had contrived an idea and made a proof-of-principle experiment, was brought into operation for the precession frequency determination. Developments were done on the field current stabilization, magnetic shielding and environmental field compensation, and as a result the frequency precision of 7.9 nHz was achieved which would correspond to a factor of 5 improvement in the EDM sensitivity. In addition, a co-magnetometer taking advantage of simultaneous masing of 3He spins was successfully incorporated to the 129Xe maser system. By uniting all these achievements together, the basis for the 129Xe EDM search experiment will soon be established.

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Detection of neutrino pairs using macro coherent amplification mechanism

Grant number：21104002 2009.04 - 2015.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

SASAO NOBORU, NAKANO Itsuo, YOSHIMURA Motohiko, FUKUMI Atsushi, WAKABAYASHI Tomonari, TANAKA Minoru, KATSURAGAWA Masayuki, NANJO Hajime, KAWAGUCHI Kentarou, TANG Jian, KUBOZONO Yoshihiro, TANIGAKI Katsumi, NAKAJIMA Kyo, YOSHIMURA Koji, YOSHIMI Akihiro, UETAKE Satoshi, KUMA Susumu, TANIGUCHI Takashi

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Grant amount：\411840000 （ Direct expense: \316800000 、 Indirect expense：\95040000 ）

"Macro-coherent amplification mechanism" is the crucial principle for success of the neutrino mass spectroscopy with atoms. The most important result of the present research was an experimental proof of the principle with a two photon process from the vibrationally excited state of para-hydrogen molecules. Actually, the initial coherent states were prepared by an adiabatic Raman process, and two photon emissions were observed. As a result, a gigantic enhancement factor of the photon yields greater than 15 orders of magnitude was confirmed compared to its natural emission rate; it was found consistent with the theoretical prediction. Thus a big step has been made forward towards the neutrino mass spectroscopy with atoms. In addition, detailed studies on super-radiance and phase relaxation etc. were conducted as basic studies using various atoms and molecules.

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Application of nuclear spin maser of a new scheme to the experimental study of atomic electric dipole moment

Grant number：21244029 2009.04 - 2014.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

ASAHI Koichiro, UENO Hideki, FURUKAWA Takeshi, YOSHIMI Akihiro, UCHIDA Makoto

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Grant amount：\44330000 （ Direct expense: \34100000 、 Indirect expense：\10230000 ）

In order to pursue a high sensitivity detection of the CP-violating permanent electric dipole moment (EDM) of 129Xe atom, a nuclear spin maser of new scheme which runs on the basis of optical spin detection and external feedback mechanism was constructed. Detailed investigations and improvements of its signal performance and frequency stability were carried out, yielding a frequency precision of 7.9 nHz for a one shot measurement of 30,000 s duration. Furthermore, 3He were added as a reference spin system to the 129Xe masing substance, and the technique to polarize, preserve and detect the two spin species simultaneously was developed. As a result, the simultaneous operations of the 129Xe-3He two species nuclear spin maser, which allows the precision removal of spurious EDM signals arising from drifts in the magnetic field, was realized, and thus the instrumental and technical basis for executing the projected high-precision EDM detection in 129Xe was established.

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核スピンの精密制御を用いた原子の電気双極子モーメント探索

2008.04 - 2011.03

文部科学省科研費基盤研究(B)

吉見彰洋

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Authorship：Principal investigator Grant type：Competitive

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Ultrahigh-Sensitivity Search for an Electric Dipole Moment of^<129>Xe atom by Means of Nuclear Spin Maser with Artificial Feedback

Grant number：15104003 2003 - 2007

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

ASAHI Koichiro, UCHIDA Makoto, YOSHIMI Akihiro

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Grant amount：\98800000 （ Direct expense: \76000000 、 Indirect expense：\22800000 ）

Violation of CP invariance, known for more than 40 years in neutral K decay and recently confirmed also in B decay, remains one of vital subjects in contemporary particle physics. The standard Model (SM) includes the CP violation in a form of complex phase in the K-M matrix elements and well represents the observed flavor-changing K and B decays, but never provide a permanent electric dipole moment (EDM) of detectable size. On the other hand, models proposed beyond the SM, such as supersymmetric one, predict sizeable values for EDM, thus rendering EDM an exclusive position as a probe of physics beyond the SM. The present research has aimed at development of new scheme of nuclear spin maser that enables precision determination of spin precession frequency, in order to pave a route for ultrahigh-sensitivity search for an EDM in a ^<129>Xe atom.
^<129>Xe nuclear spins of Xe gas contained in a 22 mm-diameter glass cell were successfully polarized by spin exchange with optically pumped Rb vapor, their precession was detected by probe Laser light, and a self-sustaining precession by means of an artificial feedback was observed for the first time. The observed precision in frequency proved to improve as Δv ∝ 1/T^<1.5> as a function of the measurement time T until T = 3000 s, and then tended to be flattened. Following this result, we worked out several improvements in the setup, including the magnetic shielding, magnet current stabilization, Laser operation and wavelength stabilization, and cell temperature control, and finally attained Δv = 9.3 nHz (amounting to EDM sensitivity of Δd 〜 9×10^<-28> ecm) in a measurement time T = 30000 s. Also, a number of issues were identified that have decisive effects on the v precision and definitely deserve further work for improvement. We thus conclude that the present work has confirmed effectiveness of novel method for the atomic EDM search, and has clarified the directions that should enable the long awaited EDM precision.

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低周波数核発振器の開発研究

Grant number：13740173 2001 - 2002

日本学術振興会科学研究費助成事業若手研究(B)

吉見彰洋

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Grant amount：\2000000 （ Direct expense: \2000000 ）

本研究では偏極した希ガス元素^<129>Xe原子核スピンのコヒーレンス制御を外部フィードバック機構を用いて行って、スピン歳差を長時間維持する核スピンメーザーの開発を行なった。それにより従来の核スピンメーザーでは発振不可能であった低周波数領域(〜30Hz)で核スピンの発振を実現することに成功した。核スピンの歳差を維持する発振現象を実現するためには、偏極スピンの横成分に常に直交する横磁場をスピン系に印可しなければならない。そのため、外部共振器型半導体レーザーを用いて光学的に^<129>Xe核スピンの歳差位相を検出するシステムを構築した。この光学的手法は、NMRコイルでの検出が困難な低周波数のスピン歳差に対して有効である。こうして検出されたスピン歳差信号を位相検波し、演算回路を通じて、横方向磁場の位相・振幅を調整してスピン系に印可する。
この「フィードバック磁場」の生成において位相の誤差が生じると核スピン歳差の定常発振周波数がシフトする。これはレーザーにおける引き込み効果と同等のもので、本研究で用いたフィードバックシステムではこのフィードバック磁場の位相を精密に制御することが可能である。この位相誤差とスピン横緩和時間T_2を変数とした際の発振周波数シフトの測定を行なった。その結果、修正Bloch方程式から導かれるものと良い一致を示し、T_2=300sでは周波数誤差は位相誤差1°あたり9μHzまで抑えられることが分かった。この光学的スピン検出を用いた核スピン発振器が電気双極子モーメントの探索実験などの精密物理実験にとって有用であることが分かつた。

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素粒子を観てみよう

Role(s)：Lecturer

岡山大学異分野基礎科学研究所公開講座 2018.9.1

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Type：Lecture

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原子と光の高度な制御で挑むニュートリノ・宇宙の謎

Role(s)：Lecturer

岡山大学オープンキャンパス 2017.8.5 - 2017.8.6

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Type：Lecture

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岡山大学理学部紹介

Role(s)：Lecturer

兵庫県立社高校/高大連携進路ガイダンス 2017.7.14

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Type：Other

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