二阶无规相近似对原子核集体激发态的研究
Research of Second Random-Phase-Approximation on the Nuclear Collective Excited States
杨明军 1张春雷 2白春林 1张焕乔3
作者信息
- 1. 四川大学物理学院,成都 610065
- 2. 北京师范大学核科学与技术学院,北京 100875
- 3. 中国原子能科学研究院,北京 102413
- 折叠
摘要
原子核的集体激发态是原子核在坐标、自旋和同位旋等空间的共振产生.研究这些激发态可以获取原子核结构性质以及内部核子-核子相互作用的信息,此外还能为天体核物理提供重要的输入量.基于Skyrme密度泛函的自洽二阶无规相近似(SRPA)理论被用于研究闭壳原子核的这些集体激发态,包括无电荷交换的正常宇称态0+、2+、3-,以及电荷交换的伽莫夫-泰勒(GT)跃迁.此外,两粒子-两空穴组态下的张量力效应被突出讨论,研究指出它能产生低能正常跃迁或者提高它们的跃迁强度,另外加入张量力后能系统地描述一系列闭壳核的GT巨共振的强度和激发能,并自洽地描述不稳定闭壳或准闭壳核的β衰变半衰期.
Abstract
The collective excited states are macroscopically described as the nuclear resonances in coordinate,spin,and isospin spaces.Researching these excited states may acquire the properties of nuclear structure and the information of nucleon-nucleon interaction inside nucleus.In addition,it may also provide important input for nuclear astrophysics.The self-consist-ent Second Random Approximation(SRPA)theory based on Skyrme density functional was applied to research these collect-ive excited states,including normal parity 0+,2+,3-sates,and charge-exchange Gamow-Teller(GT)transition.In addition,the effects of tensor force under the two particle-two hole configurations are discussed primarily.And the research points out that it may produce low-energy normal transition states or enhance their transition strengths.Moreover,the including of tensor force is helpful for the systematical describing of the strength and excitation energy of GT giant resonances of a series of closed-shell nuclei,and the β decay half-lives of closed-shell or quasi closed-shell nuclei.
关键词
正常宇称态/伽莫夫-泰勒跃迁/β衰变/张量力/二阶无规相近似Key words
normal parity state/Gamow-Teller transition/β decay/tensor force/Second Random Phase Approximation引用本文复制引用
基金项目
国家自然科学基金资助项目(11822504)
国家自然科学基金资助项目(11575120)
出版年
2024
NETL
NSTL
万方数据