New band mechanism of doubly-odd nuclei around mass 130
New band mechanism of doubly-odd nuclei around mass 130
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DOI：
10.1103/physrevc.72.024315
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发表时间：
2005-08
影响因子：
3.1
通讯作者：
K. Higashiyama;N. Yoshinaga;K. Tanabe
中科院分区：
文献类型：
--
作者：
K. Higashiyama;N. Yoshinaga;K. Tanabe
本文用对截断壳模型研究了双奇核{sup 130}Cs，{sup 132}Cs，{sup 132}La和{sup 134}La的{delta}I=1双重带的核结构，其中角动量为0和2的集体核子对是其基本成分.有效的相互作用包括单粒子能量和双极和四极配对加上四极-四极相互作用，其强度被确定为描述质量A {approx} 130区域的偶偶核的能级方案。计算很好地再现了双重态的能级和电磁跃迁，特别是对yraast态的比值B（M1;I{yields}I-1）/B（E2;I{yields}I-2）的错开。通过波函数的分析，二重带原来是由不同的角动量配置的未成对的中子和未成对的质子，弱耦合的四极集体激发的偶-偶部分的核。
The nuclear structure of the {delta}I=1 doublet bands in doubly-odd nuclei {sup 130}Cs, {sup 132}Cs, {sup 132}La, and {sup 134}La is studied in terms of a pair-truncated shell model, in which the collective nucleon pairs with angular momenta of zero and two are its basic ingredients. The effective interactions consist of single-particle energies and monopole and quadrupole pairing plus quadrupole-quadrupole interactions, whose strengths are determined so as to describe the level schemes of even-even nuclei in the mass A {approx} 130 region. The calculation reproduces well the energy levels of the doublet bands and the electromagnetic transitions, especially the staggering of the ratios B(M1;I{yields}I-1)/B(E2;I{yields}I-2) for the yrast states. Through the analysis of the wave functions, the doublet bands turn out to be made of different angular momentum configurations of an unpaired neutron and an unpaired proton, weakly coupled with the quadrupole collective excitations of the even-even part of the nucleus.