Measurement of electric quadrupole moments of neutron-rich nuclei14B and15B |
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| Authors: | Izumi H. Asahi K. Ueno H. Okuno H. Sato H. Nagata K. Hori Y. Adachi M. Aoi N. Yoshida A. Liu G. Fukunishi N. Ishihara M. |
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| Affiliation: | (1) Department of Applied Physics, Tokyo Institute of Technology, Meguro-ku, 152 Tokyo, Japan;(2) Institute of Physical and Chemical Research (RIKEN), Wako, 351-01 Saitama, Japan;(3) Department of Physics, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan;(4) Present address: Nippon Telegraph and Telephone Corporation, Uchisaiwai-cho 1-1-7, Chiyoda-ku, 100 Tokyo, Japan;(5) Present address: Toshiba Corporation, Shibaura 1-1-1, Minato-ku, 105 Tokyo, Japan;(6) Present address: Institute of Modern Physics, Chinese Academy of Sciences, 253 Nanchang Road, 730000 Lanzhou, Gansu Province, PR China |
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| Abstract: | The experimental study of nuclear moments of several neutron-rich nuclei, using the phenomenon of ejectile spin polarization in the projectile fragmentation reaction, is reported. The spin-polarized fragments14B and15B were produced in the fragmentation of18O projectiles on a Nb target at 64.7 MeV/u. They were implanted into a Mg single crystal, and the quadrupole momentsQ were determined by the -NMR method. The results, ¦Q(14B)¦ =29.84 ±0.75 mb and ¦Q(15B)¦=38.01 ±1.08 mb, are compared with theoretical models. Shell model calculations in a 0  model space, using effective charges commonly accepted in this mass region, predict values about 40% larger than the experimentalQ(15B). Agreement is obtained when a much smaller effective charge for neutrons is employed. The method was also applied to the measurement of the magnetic moments of17N and17B. The result reveals an important contribution of configurations with excess neutrons coupled to formJ =2+. |
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