研究者詳細 - 吉見　彰洋

論文 - 吉見　彰洋

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Nuclear moment studies with polarized radioactive nuclear beams 査読

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

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

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

SPIN 2000 570 353 - 357 2001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

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

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

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

HYPERFINE INTERACTIONS 136 211 - 214 2001年

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

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

DOI： 10.1023/a:1020584316404

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Magnetic moment and electric quadrupole moment of the N ground state

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

Physics Letters B 451 ( 1-2 ) 11 - 18 1999年4月

Static moments of the N-18 ground state 査読

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

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 24 ( 8 ) 1399 - 1402 1998年8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：IOP PUBLISHING LTD

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

DOI： 10.1088/0954-3899/24/8/013

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Polarized 129Xe solid for polarizing unstable nuclei

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

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 402 ( 2-3 ) 241 - 243 1998年1月

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

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

Physics Letters B 391 ( 1-2 ) 11 - 14 1997年1月

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年5月

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