研究者詳細 - 吉見　彰洋

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

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年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IOP PUBLISHING LTD

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

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

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年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：ELSEVIER SCIENCE BV

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

DOI： 10.1016/j.phpro.2011.06.024

Development of NMOR magnetometer for spin-maser EDM experiment 査読

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年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：ELSEVIER SCIENCE BV

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

DOI： 10.1016/j.phpro.2011.06.043

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年

掲載種別：研究論文（国際会議プロシーディングス）

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

18pSK-14 超流動ヘリウム中に打ち込まれた^<87>Rbビームのレーザー誘起蛍光観測と光ポンピング(18pSK 不安定核(II),実験核物理領域)

古川武, 松浦佑一, 加藤裕樹, 山口康広, 今村慧, 幕田将宏, 畠山温, 和田道治, 園田哲, 伊藤由太, 七尾翼, 涌井崇志, 小林徹, 西村俊二, 西村美月, 近藤洋介, 青井考, 米田健一郎, 久保野茂, 上野秀樹, 下田正, 篠塚勉, 佐々木彩子, 旭耕一郎, 松尾由賀利, 泉さやか, 市川雄一, 吉見彰洋, 田尻邦彦, 石井裕司, 吉田直貴

日本物理学会講演概要集 66 91 - 91 2011年

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

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

Journal of Physics: Conference Series 302 ( 1 ) 2011年

掲載種別：研究論文（国際会議プロシーディングス）

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

DOI： 10.1088/1742-6596/302/1/012054

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

28pGK-2 ^<87>Rbビームを用いた超流動ヘリウム中でのレーザー核分光法開発実験(28pGK 検出器IV,実験核物理領域)

古川武, 松浦佑一, 加藤裕樹, 山口康広, 今村慧, 幕田将宏, 畠山温, 和田道治, 園田哲, 伊藤由太, 七尾翼, 涌井崇志, 小林徹, 西村俊二, 西村美月, 近藤洋介, 青井考, 米田健一郎, 久保野茂, 大城幸光, 上野秀樹, 下田正, 佐々木彩子, 篠塚勉, 旭耕一郎, 松尾由賀利, 泉さやか, 市川雄一, 吉見彰洋, 田尻邦彦, 石井裕司, 吉田直貴

日本物理学会講演概要集 66 99 - 99 2011年

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

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

Journal of the Physical Society of Japan 79 ( 7 ) 073201 - 073201 2010年7月

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

HYPERFINE INTERACTIONS 198 ( 1-3 ) 103 - 107 2010年6月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：SPRINGER

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

DOI： 10.1007/s10751-010-0262-8

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年

掲載種別：研究論文（学術雑誌）

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

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

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年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

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

g factors of N17and N18 remeasured

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

Physical Review C 80 ( 3 ) 2009年9月

Ground-state electric quadrupole moment of Al31

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

Physical Review C 79 ( 2 ) 2009年2月

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

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

SPIN PHYSICS 1149 249 - + 2009年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AMER INST PHYSICS

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

Nuclear Structure Studies with Polarized Radioactive Beams 査読

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年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：AMER INST PHYSICS

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.