Shell evolution of stable N = 50-56 Zr and Mo nuclei with respect to low-lying octupole excitations
Shell evolution of stable N = 50-56 Zr and Mo nuclei with respect to low-lying octupole excitations
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DOI：
10.1140/epja/i2017-12224-7
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
E. Gregor;M. Scheck;R. Chapman;L. Gaffney;J. Keatings;K. Mashtakov;D. O’Donnell;J. Smith;
中科院分区：
文献类型：
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作者：
E. Gregor;M. Scheck;R. Chapman;L. Gaffney;J. Keatings;K. Mashtakov;D. O’Donnell;J. Smith;
对于n = 50-56的锆（Z= 40）和钼（Z= 42）同位素，通过从现有粒子转移数据中提取有效单粒子能量来评估其亚壳演化。提取的中子亚壳的系统演化和八极声子激发能的系统分布为Zr同位素中ii型形态共存提供了证据。采用一种简单的方法，利用相对有效的单粒子能量来估计在所提出的能量下是否可能形成低洼的八极子-等矢量激发。结果引起了对这项任务的质疑。
For theN= 50-56 zirconium (Z= 40) and molybdenum (Z= 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.