2022 Impact factor 2.7
Hadrons and Nuclei

Eur. Phys. J. A 13, 81-85 (2002)

Quenching of neutron $\mth{E2}$ effective charge in neutron-rich nuclei and the ground-state spin-parity of $\chem{^{17}C}$

H. Ogawa1, K. Asahi1, 2, H. Ueno2, K. Sakai1, H. Miyoshi1, D. Kameda1, T. Suzuki1, H. Izumi1, N. Imai3, Y.X. Watanabe2, K. Yoneda2, N. Fukuda3, H. Watanabe2, A. Yoshimi2, W. Sato2, N. Aoi3, M. Nagakura1, T. Suga1, K Yogo1, A. Goto1, T. Honda1, Y. Kobayashi2, W.-D. Schmidt-Ott4, G. Neyens5, S. Teughels5, A. Yoshida2, T. Kubo2 and M. Ishihara6

1  Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
2  RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
3  Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
4  Zweites Physikalisches Institut, Universität Göttingen, Bunsenstrasse 7-9, D-37073 Göttingen, Germany
5  Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
6  RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA

(Received: 1 May 2001 / Revised version: 28 June 2001)

The electric quadrupole moment of 17B and the g-factor of 17C were measured by using the fragmentation-induced nuclear polarization technique combined with the $\beta$-NMR method. The experimental quadrupole moment of 17B is found strikingly close to that of the neutron closed-shell isotope 13B, indicating a strong quenching of the neutron E2 core-polarization charge. From the result obtained for the 17C g-factor, we can conclude that the ground-state spin-parity of $\chem{^{17}C}$ is 3/2+.

21.10.Ky - Electromagnetic moments.
24.70.+s - Polarization phenomena in reactions.
25.70.Mn - Projectile and target fragmentation.

© Società Italiana di Fisica, Springer-Verlag 2002