丰中子锰同位素的壳模型计算  

Shell Model Calculations for Neutron-rich Mn Isotopes

作　　者：金华[1,2] 王韩奎[3] 孙扬[4,2] 

机构地区：[1]上海电机学院数理教学部,上海201306 [2]中国科学院近代物理研究所高精度核谱学重点实验室,兰州730000 [3]周口师范学院物理与电信工程学院,河南周口466000 [4]上海交通大学物理与天文系,上海200240

出　　处：《原子核物理评论》2016年第3期268-273,共6页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11505302,11135005,11575112);中国科学院近代物理研究所高精度核谱学重点实验室开放课题项目~~

摘　　要：利用球形壳模型和投影壳模型两种方法对Z≤28,N=40附近pf壳的丰中子核素的结构进行了一系列的研究。以丰中子的锰同位素为例讨论了对奇奇核^(58,60)Mn的两种壳模型计算结果。结果显示,两种理论方法都很好地再现了^(58,60)Mn实验上观测到的从低激发到高自旋态的能级。在对这两个同位素由中子g9/2轨道闯入所产生的负宇称转动带进行描述时,两种理论计算也得到了一致的结果。通过对比,阐明了两种壳模型方法及其采用的有效相互作用在该丰中子核区的适用性,特别强调了中子g9/2轨道的激发对于pf壳Z≤28丰中子核素结构的重要性。Recently, we have carried out a series of studies on the structures of pf shell neutron-rich nuclei around N = 40 using the spherical shell model and the projected shell model respectively. As an example, these two types of shell model calculations for the neutron-rich odd-odd isotopes^58,60Mn are discussed in this paper.The results show that both the calculations reproduce the observed experimental energy levels from the lowexcitation states to the high-spin ones in ^58,60Mn. Consistent results are also obtained by these two theoretical calculations when describing the negative-parity rotational band derived from the intruder neutron g9/2 orbital in both isotopes. Through comparison, we show the applicability of these two shell model methods and the adopted effective interactions in the present neutron-rich mass region. The significance of the excitations from neutron g9/2 orbital to the structures of the neutron-rich nuclei in pf shell with Z≤28 are especially emphasized in this paper.

关 键 词：丰中子核 锰同位素 球形壳模型 投影壳模型 

分 类 号：O571.2[理学—粒子物理与原子核物理]