Pair-truncated shell-model analysis of nuclei around mass 130
Pair-truncated shell-model analysis of nuclei around mass 130
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DOI：
10.1103/physrevc.83.034321
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发表时间：
2011-03
影响因子：
3.1
通讯作者：
K. Higashiyama;N. Yoshinaga
中科院分区：
文献类型：
--
作者：
K. Higashiyama;N. Yoshinaga
利用对截断壳模型系统地研究了质量为A~130$的偶偶核、奇质量核和双奇核的低激发态。在这个模型中，角动量为0和2的集体核子对是偶偶核的基本成分。额外的未成对核子被添加到偶-偶核中，以描述奇质量和双奇核。有效相互作用由单粒子能量、双极对和四极对以及四极-四极相互作用组成，其强度被假定为核子数的线性函数，以描述奇偶核和奇质量核的能级结构.沿着带内和带间的$B（E2）$值很好地再现了偶偶同位素Ba、Ce和Nd的低集体态能级，模拟了相互作用玻色子模型的O（6）极限的典型特征。对于奇质量核和双奇核，复杂的能级方案和电磁矩与实验数据符合得很好。
Low-lying states for even-even, odd-mass, and doubly odd nuclei in the mass $A~130$ region are systematically investigated using a pair-truncated shell model. In this model the collective nucleon pairs with angular momenta zero and two are the basic ingredients for even-even nuclei. Additional unpaired nucleons are added to the even-even core for a description of odd-mass and doubly odd nuclei. The effective interactions consist of single-particle energies and monopole and quadrupole pairing plus quadrupole-quadrupole interactions, whose strengths are assumed to be linearly changed as functions of the number of nucleons so as to describe the level schemes of the even-even and odd-mass nuclei. Energy levels of the low-lying collective states for even-even Xe, Ba, Ce, and Nd isotopes are reproduced very well along with intraband and interband $B(E2)$ values, which simulate the typical features of the O(6) limit of the interacting boson model. For odd-mass and doubly odd nuclei, complicated level schemes and electromagnetic moments are in excellent agreement with the experimental data.