发表机构
University of Kashmir; Institute of Physics (IOP); Homi Bhabha National Institute; Department of Physics, GDC Shopian; Department of Physics, Govt. Degree College Kulgam（克什米尔大学; 印度物理研究所; 霍米·巴巴国立研究所; 肖皮安女子学院物理系; 库尔甘政府学位学院物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文用三轴投影壳模型研究六个N=74同中子异位素的8^-同核异能素衰变，发现多准粒子混合导致阻碍因子随原子序数递减，且模型能较好再现激发能和B(E2)跃迁概率。
AI 中文摘要
采用三轴投影壳模型（TPSM）的微观方法，研究了$^{128}$Xe、$^{130}$Ba、$^{132}$Ce、$^{134}$Nd、$^{136}$Sm和$^{138}$Gd这六个同中子异位素中$8^-$同核异能素的性质。观测到的这些同中子异位素的同核异能素衰变模式出乎意料，其阻碍因子随原子序数增加而减小。本工作表明，多准粒子混合进入基态组态是导致观测到的阻碍因子递减趋势的原因。我们还计算了这六个同中子异位素的晕带和基于$8^-$同核异能素构建的带的激发能及带内$B(E2)$跃迁概率，结果表明TPSM方法能相当令人满意地再现测量到的量。
英文摘要
The microscopic approach of the triaxial projected shell model (TPSM) is employed to investigate the properties of the $8^-$ isomer in the six isotones of $^{128}$Xe, $^{130}$Ba, $^{132}$Ce, $^{134}$Nd, $^{136}$Sm, and $^{138}$Gd. The observed decay pattern of the isomer for these isotones is unexpected with the hindrance factor decreasing with atomic number. It is shown in the present work that multi-quasiparticle mixing into the ground-state configuration is responsible for the observed decreasing trend of the hindrance factor. We have also calculated the excitation energies and in-band $B(E2)$ transition probabilities of the yrast and the band built on the $8^-$ isomer for the six isotones, and it is shown that TPSM approach reproduces the measured quantities quite satisfactorily.
Comments11 pages, 8 figures
