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

H. Ogawa, K. Asahi, K. Sakai, T. Suzuki, H. Izumi, H. Miyoshi, M. Nagakura, K. Yogo, A. Goto, T. Suga, T. Honda, H. Ueno, Y. X. Watanabe, K. Yoneda, A. Yoshimi, N. Fukuda, Y. Kobayashi, A. Yoshida, T. Kubo, M. IshiharaN. Imai, N. Aoi, W. D. Schmidt-Ott, G. Neyens, S. Teughels

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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(17 in Mg)| = 137.4±4.5 kHz, for 17B in a Mg single crystal stopper the Q moment was deduced as |Q(17B)| = 38.6±1.5 mb. 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.

Original languageEnglish
Article number064308
Pages (from-to)643081-643089
Number of pages9
JournalPhysical Review C - Nuclear Physics
Issue number6
Publication statusPublished - Jun 2003
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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