Updated on 2022/04/17

写真a

 
YOSHIMI Akihiro
 
Organization
Research Institute for Interdisciplinary Science Associate Professor
Position
Associate Professor
External link

Degree

  • 博士(理学) ( 東京工業大学大学院 )

Research Interests

  • 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

  • 229Th

  • 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

  • アイソマー(核異性体)

  • ランタノイドドープ結晶

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

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

  • 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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  • 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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    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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    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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  • 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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    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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    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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  • 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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    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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  • 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

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

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

    Eur. Phys. J. D   70   129   2016

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

    DOI: 10.1140/epjd/e2016-70034-8

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

    DOI: 10.1007/s10751-014-1100-1

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

    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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    Other Link: http://orcid.org/0000-0001-8122-5145

  • 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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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER INTERNATIONAL PUBLISHING AG  

    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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    Other Link: http://orcid.org/0000-0001-8122-5145

  • 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   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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  • 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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  • 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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  • 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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  • 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.

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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.

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    Other Link: http://orcid.org/0000-0001-8122-5145

  • 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.

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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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    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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  • 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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    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]

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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.

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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.

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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.

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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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  • 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   ( 1 )   04D002   2012

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    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.

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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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    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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    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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    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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    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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  • 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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  • 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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    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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    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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  • 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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    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.

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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.

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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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    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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  • 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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    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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    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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    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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  • 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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    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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  • 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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    DOI: 10.1016/s0375-9601(02)01324-5

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  • 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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    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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    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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    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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  • 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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    DOI: 10.1016/s0370-2693(99)00219-1

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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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    DOI: 10.1016/s0168-9002(97)00842-5

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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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MISC

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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   2016.9

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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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  • 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 )   2013

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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 )   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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  • 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 )   2012

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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 )   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 )   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

  • 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

  • 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

  • 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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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

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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

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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

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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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  • 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 )

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  • ガンマ線レーザー研究のためのトリウム-229 核量子操作

    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)

    吉見 彰洋

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

    今年度は本研究で使用する真空紫外光に透明な結晶の候補の中で、 CaF2 結晶にトリウム-229をドープした Th229:CaF2 を用いて8eV超低励起アイソマー準位からの脱励起光の探索実験を行った。この脱励起光は 150 nm 周辺の真空紫外光が期待され、この光を検出・分光することでアイソマー準位のエネルギーや寿命を決定することが可能になる。Th-229 のアイソマー準位に遷移させるために、現在 SPring-8 の 29 keV 放射光を照射して第2励起状態への励起を行っており、29 keV からの脱励起光強度がピークになる放射光エネルギーに固定することで、確実にアイソマー準位に遷移されることになる。今年の実験ではアイソマー準位の寿命は予想される30分を仮定して、30分間放射光を 229Th:CaF2 に照射して放射光入射を止めた後、30分間脱励起真空紫外光の検出を行った。バックグランド光を抑制するために、放射光照射と真空紫外光検出は真空チェンバーを分けて、モーターで各場所に行き来するシステムを構築した。また検出光の波長を識別できるように光電子増倍管の前に真空紫外領域のバンドバスフィルターも用いた。放射光の波長を励起点に合わせた場合と十分はずした場合で真空紫外光子の計数差の観測を行い、その信号計数率が 0.3 Hz 程度であれば検出できるシステムを構築できた。なお、今の実験パラメータで期待される信号計数率は不確定性はあるが、 0.1 Hz 程度である。現段階では未だ有意な信号は得られていないが、次年度にシステムに改善を施す予定である。

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  • 原子の量子増幅効果を利用したニュートリノ質量測定に向けた基礎研究

    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)

    吉見 彰洋

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

    前年度に構築した発振波長 298 nm のパルスレーザーを用いて Xe 原子の準安定状態 5p6s_J=2 への 2光子励起実験を行った。この遷移では電気双極子(E1)の2光子遷移は禁止され、磁気双極子・電気双極子の2光子(E1M1)あるいは電気双極子・電気四重極子の2光子(E1E2) の遷移であることから励起確率が低く、先行研究はほとんど無い。共鳴励起を確認するために、298nm レーザーの周波数離調をスキャンして準安定状態からのイオン化再結合による蛍光強度を観測した。その結果、8.32 eV に相当する励起エネルギーで蛍光ピークが観測され、準安定状態への2光子励起に相当することを確認した。また、準安定状態に遷移した原子を直接計数することを目的として、823 nm の CWレーザーを照射して 5p6p 状態に励起した後の脱励起光の分光実験も行った。その際、イオン化再結合からの蛍光と識別して、準安定状態からの励起による脱励起蛍光のみを抽出するために、823 nm レーザーの ON/OFF 制御を電気光学変調器(EOM)にて行った。823 nm の周波数離調をスキャンした際の波長 895nm の蛍光ピークを観測し、準安定状態に遷移した原子の確実なプローブを行うことに成功した。実験パラメータ及び、検出された光子数の関係から、生成された Xe 準安定状態の数はパルス当たり 10^5 個のオーダーと見積もられた。

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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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  • 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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  • 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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Social Activities

  • 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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  • 原子と光の高度な制御で挑むニュートリノ・宇宙の謎

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    岡山大学  オープンキャンパス  2017.8.5 - 2017.8.6

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    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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