N=28附近奇A核Co同位素的晕态研究
The Yrast State Investigations of Odd-A Co Isotopes around N=28
陈铎 1郭瑞 2王恒毅 1金华 3李剑1
作者信息
- 1. 吉林大学物理学院,长春 130012
- 2. 北京航空航天大学物理学院,北京 100083
- 3. 上海电机学院文理学院,上海 201306
- 折叠
摘要
奇A核53-65Co负宇称晕态能级结构的系统性比较表明,55Co存在能级9/2-与11/2-反转,且53,57Co可能存在较强的集体效应.基于GXPF1A有效相互作用的壳模型计算较好地再现这些核的晕态能级,及相应的磁矩和电四极矩实验值.壳模型计算结果展示53-65Co基态7/2-波函数中质子主要组态成分均为π(1f7/2)7.55Co中激发态9/2-与11/2-中1f7/2质子激发和1f7/2中子激发之间存在竞争,从而导致两能级反转.此外,利用Constrained Hartree-Fock(CHF)方法研究了 53,55,57Co四极形变特征,结合壳模型计算得到的平均占据数和组态,分析了 55Co激发态能量相较于其他Co同位素更高的原因.
Abstract
A systematic comparison of the negative parity yrast states'energy level structures indicates a level inversion between the 9/2-and the 11/2-in 55Co,and suggests that 53Co and 57Co might exhibit strong collective effects.Shell model calculations based on the GXPF1A effective interaction accurately reproduce yrast state halo state energy levels of these nuc-lei,as well as the corresponding experimental magnetic moments and electric quadrupole moments.The shell model results show that the dominant component of proton configuration for the ground state 7/2-in 53-65Co is π(1f7/2)7.The excited states 9/2-and 11/2-in 55Co involve a competition between 1f7/2 proton excitation and 1f7/2 neutron excitation,leading to a possible level inversion between the these states.Moreover,by using the Constrained Hartree-Fock(CHF)method to study the quadrupole deformation characteristics of 53Co,55Co and 57Co,and combining the average occupancy numbers and con-figurations obtained from shell model calculations,the reasons for higher the excited state energies of 55Co compared to other Co isotopes were analyzed.
关键词
Co/壳模型/晕态/基态自旋/原子核形变Key words
Co/shell model/Yrast state/ground-state spin/nuclear deformation引用本文复制引用
基金项目
吉林省自然科学基金项目(20220101017JC)
国家自然科学基金资助项目(11675063)
出版年
2024
NETL
NSTL
万方数据