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Giant quadrupole moment andproton halo discovered in8B |
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| Authors: | T Minamisono T Ohtsubo I Minami A Kitagawa S Fukuda Y Nakayama M Fukuda K Matsuta Y Nojiri S Takeda H Sagawa H Kitagawa |
| Institution: | (1) Department of Physics, Faculty of Science, Osaka University, 560 Toyonaka, Osaka, Japan;(2) Department of Chemistry, Faculty of Science, Osaka University, 560 Toyonaka, Osaka, Japan;(3) Department of Physics, Faculty of Science, The Tokyo University, 113 Bunkyo, Tokyo, Japan;(4) Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, 567 Ibaraki, Osaka, Japan |
| Abstract: | The nuclear quadrupole moment of8B(I
 =2+,T
1/2=769 ms) has been determined by use of a modified  -NMR detection as |Q(8B)|=68.3±2.1 mb, which is twice the prediction of the Cohen-Kurath shell model calculation. The anomalous quadrupole moment which is carried mainly by the protons in the nucleus, has been accounted for by the proton halo effect. |
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