Role of the Z = 64 Core Excitation in High-Spin Isomers in Proton-Rich N ～ 82 Nuclei Role of the Z=64 Core Excitation in High-Spin Isomers in Proton-Rich N-82 Nuclei
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The high-spin isomers of the N ～ 82 nuclei with Z > 64 are investigated in the shell model framework. We derive an extended seniority reduction formula for the relevant E2 transition strengths. Based on the extended formula, as well as on the approximate degeneracy among the 0h_11/2, 2s_1/2 and 1d_3/2 orbits, we argue that the B(E2) data require the ^146Gd core excitation. The energy levels of both parities and the B(E2) values are simultaneously reproduced by a multi-j shell model calculation, if the pair excitations from (0g_7/21d_5/2) to (2s_1/20h_11/21d_3/2) are taken into account.
- Progress of theoretical physics. Supplement
Progress of theoretical physics. Supplement (146), 595-596, 2002-12-26
Progress of Theoretical Physics