Proton halo of B8 disclosed by its giant quadrupole moment

T. Minamisono, T. Ohtsubo, I. Minami, S. Fukuda, A. Kitagawa, M. Fukuda, K. Matsuta, Y. Nojiri, S. Takeda, H. Sagawa, and H. Kitagawa
Phys. Rev. Lett. 69, 2058 – Published 5 October 1992
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Abstract

The quadrupole moment of the B8 (Iπ=2+, T1/2=769 msec) nucleus was measured as ‖Q(8B)‖=68.3±2.1 mb by use of modified β-NMR. This value is twice as large as the prediction of the Cohen-Kurath shell model. It is found by subtracting the contribution of deeply bound neutrons that the protons in B8 carry more than 90% of the observed moment. The anomalous value is accounted for fairly well by the proton halo due to the loosely bound valence configuration. This is the first experimental evidence for the existence of a proton halo covering a neutron core.

  • Received 29 May 1992

DOI:https://doi.org/10.1103/PhysRevLett.69.2058

©1992 American Physical Society

Authors & Affiliations

T. Minamisono, T. Ohtsubo, I. Minami, S. Fukuda, A. Kitagawa, M. Fukuda, K. Matsuta, Y. Nojiri, S. Takeda, H. Sagawa, and H. Kitagawa

  • Department of Physics, and Laboratory of Nuclear Studies, Faculty of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560, Japan
  • Department of Chemistry, Faculty of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560, Japan
  • Department of Physics, Faculty of Science, The University of Tokyo, 7-3-1 Hongou 7-3-1, Bunkyo, Tokyo 113, Japan
  • Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567, Japan

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Issue

Vol. 69, Iss. 14 — 5 October 1992

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