^(68)Ni和^(132)Sn中同位旋矢量的巨偶极共振  

Isospin vector giant dipole resonance in^(68)Ni and^(132)Sn

作　　者：刘玲[1] 卢宇威 曹李刚 LIU Ling;LU Yuwei;CAO Ligang(College of Physics Science and Technology,Shenyang Normal University,Shenyang 110034,China;College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China)

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034 [2]北京师范大学核科学与技术学院,北京100875

出　　处：《沈阳师范大学学报（自然科学版）》2024年第2期172-179,共8页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11575060,11375062,11505057,11647306).

摘　　要：探讨了丰中子原子核^(68)Ni和双幻核^(132)Sn中的同位旋矢量巨偶极共振现象。采用Skyrme-Hartree-Fock+Bardeen-Cooper-Schrieffer(Skyrme-HF+BCS)方法,计算了核的基态性质;通过无规相位近似法(random phase approximation,RPA)详细研究了偶极激发态的性质;应用非相对论参数计算了^(68)Ni和^(132)Sn的响应方程分布,并特别分析了对关联效应对响应方程分布的影响。在这项研究中,不仅观察到了巨偶极共振(giant dipole resonance,GDR),还在低于11.7 MeV的能量区域内发现了矮偶极共振(pygmy dipole resonance,PDR)。此外,研究发现响应方程中的矮偶极共振对于对称能密度的敏感性非常显著,因此可以用来约束对称能密度的行为。在选择非相对论参数时,保持了除对称能以外的所有有效参数不变,这有助于排除其他因素的影响,从而更准确地限制对称能密度的行为。因此,研究结果有望为进一步理解对称能密度依赖行为提供有力的数据支持。This research explores in detail the phenomenon of isospin vector giant dipole resonance in neutron-rich nuclei^(68)Ni and the double-magic nucleus^(132)Sn.We use the Skyrme-Hartree-Fock+Bardeen-Cooper-Schrieffer(Skyrme-HF+BCS)method to calculate the ground state properties of the nucleus.The properties of dipole excited states were studied in detail using the random phase approximation(RPA)method.We applied non relativistic parameters to calculate the response equation distribution of^(68)Ni and^(132)Sn,and particularly analyzed the impact of correlation effects on the response equation distribution.In this study,we not only observed giant dipole resonance(GDR),but also found pygmy dipole resonance(PDR)in the energy region below 11.7 MeV.In addition,research has found that the sensitivity of short dipole resonance in the response equation to symmetric energy density is very significant,so it can be used to constrain the behavior of symmetric energy density.When selecting non relativistic parameters,this study maintained all effective parameters except for symmetric energy unchanged,which helps to exclude the influence of other factors and more accurately limit the behavior of symmetric energy density.Therefore,our research results are expected to provide strong data support for further understanding the symmetric energy density dependent behavior.

关 键 词：巨偶极共振 矮偶极共振 无规相位近似 响应方程 对关联 

分 类 号：O469[理学—凝聚态物理]