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Phys. Rev. C 67, 064308 (2003) [9 pages]

Electric quadrupole moment of 17B and anomalous E2 effective charges for neutron-rich nuclei

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H. Ogawa*, K. Asahi†, K. Sakai, T. Suzuki‡, H. Izumi§, H. Miyoshi, M. Nagakura**, K. Yogo, A. Goto, T. Suga, and T. Honda
Department of Physics, Tokyo Institute of Technology, Oh-okayama 2-12-1, Meguro-ku, Tokyo 152-8551, Japan

H. Ueno, Y. X. Watanabe, K. Yoneda, A. Yoshimi, N. Fukuda, Y. Kobayashi, A. Yoshida, T. Kubo, and M. Ishihara
RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan

N. Imai and N. Aoi
Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan

W.-D. Schmidt-Ott
Zweites Physikalisches Institut, Der Universität Göttingen, Bunsenstrasse 7-9, D-37073 Göttingen, Germany

G. Neyens and S. Teughels
Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium

Received 30 December 2002; published 20 June 2003

The electric quadrupole moment Q for the ground state of 17B was determined by the β-NMR method applied to spin-polarized projectile fragments. From the measured quadrupole coupling constant, |eqQ/h(17Bin Mg)|=137.4±4.5kHz, for 17B in a Mg single crystal stopper the Q moment was deduced as |Q(17B)|=38.6±1.5mb. As was the case in the previous 15B result, the obtained Q moment is very close to that for the N=8 isotope 13B, in sharp contrast to the results of conventional shell-model calculations using constant effective charges. Comparison of the shell-model calculations indicates substantial reduction of the E2 effective charges for isotopes with large (N-Z)/A ratios. The results were well accounted for in terms of (N-Z)/A dependent E2 polarization charges as predicted by Bohr and Mottelson and by incorporating the decoupling feature of loosely bound particles.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.67.064308
DOI:
10.1103/PhysRevC.67.064308
PACS:
21.10.Ky, 21.60.Cs, 24.70.+s, 27.20.+n

*Present address: Photonics Research Institute, AIST, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568, Japan. Electronic address: ogawa.h@aist.go.jp

†Also at RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.

‡Present address: Sony LSI Design Inc., Goudo-cho 134, Hodogaya-ku, Yokohama-shi, Kanagawa 240-0005, Japan.

§Present address: Department of Physics, Osaka University, Machikaneyama 1-16, Toyonaka, Osaka 560-0043, Japan.

**Present address: Sanwa Newtec Co., Ltd., Shode 1-11, Kiyotake-Cho, Miyazaki-Gun, Miyazaki 889-1603, Japan.

 
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