| Institution: | (1) Department of Physics, Kyoto University, Kyoto, Japan;(2) Department of Physics, Konan University, Kobe, Japan;(3) Research Center for Nuclear Physics, Osaka University, Osaka, Japan;(4) Japan Synchrotron Radiation Research Institute, Sayo, Hyogo, Japan;(5) Laboratory of Nuclear Science, Tohoku University, Sendai, Japan;(6) Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Japan;(7) Center for Nuclear Study, University of Tokyo, Hongo, Tokyo, Japan;(8) Department of Physics, Kyushu University, Fukuoka, Japan;(9) RI Beam Science Laboratory, RIKEN, Wako, Japan;(10) Laboratory of Physics, Kanto Gakuin University, Yokohama, Japan;(11) NSCL/MSU, East Lansing, USA |
| Abstract: | Decay particles from the s-hole states in 11B and 15N have been measured in coincidence with the quasifree 12C(p, 2p) and 16O(p, 2p) reactions at E p =392 MeV. Triton decay is found to be dominant for the 11B(s-hole) state and also found to be larger than α decay for the 15N(s-hole) state despite its smaller Q value compared to α decay. Measured decay branching ratios are discussed in comparison with the results of statistical-model, SU(3)-model, and shell-model calculations. The energy spectra around the s-hole states in both 11B and 15N exhibit some bumplike structures, which can be qualitatively explained by recent shell-model calculations for both nuclei. |
