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陈铎, 郭瑞, 王恒毅, 金华, 李剑. N = 28附近奇A核Co同位素的晕态研究[J]. 原子核物理评论, 2024, 41(1): 184-190. DOI: 10.11804/NuclPhysRev.41.2023CNPC68
引用本文: 陈铎, 郭瑞, 王恒毅, 金华, 李剑. N = 28附近奇A核Co同位素的晕态研究[J]. 原子核物理评论, 2024, 41(1): 184-190. DOI: 10.11804/NuclPhysRev.41.2023CNPC68
Duo CHEN, Rui GUO, Hengyi WANG, Hua JIN, Jian LI. The Yrast State Investigations of Odd-A Co Isotopes around N = 28[J]. Nuclear Physics Review, 2024, 41(1): 184-190. DOI: 10.11804/NuclPhysRev.41.2023CNPC68
Citation: Duo CHEN, Rui GUO, Hengyi WANG, Hua JIN, Jian LI. The Yrast State Investigations of Odd-A Co Isotopes around N = 28[J]. Nuclear Physics Review, 2024, 41(1): 184-190. DOI: 10.11804/NuclPhysRev.41.2023CNPC68

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

  • 摘要:A53−65Co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\pi\left(1f_7/2\right)^7。55Co中激发态9/2^-与11/2^-中1f_7/2质子激发和1f_7/2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 the9/2^- 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 nuclei, 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 \pi\left(1f_7/2\right)^7. The excited states 9/2^- and 11/2^- in 55Co involve a competition between 1f_7/2 proton excitation and 1f_7/2 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 configurations obtained from shell model calculations, the reasons for higher the excited state energies of 55Co compared to other Co isotopes were analyzed.

     

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