相对论Hartree-Fock理论中16ΛO超核结构的超子耦合强度依赖

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中文摘要：超核物理研究为揭示重子-重子相互作用的核介质中特性以及理解原子核与中子星内部结构提供了关键信息.基于密度依赖的相对论Hartree-Fock(RHF)理论,拟合单Λ超核中超子分离能实验数据得到模型中ΛN有效相互作用.交换项的引入改变了超子道中有效核力的动力学平衡,导致不同于相对论平均场模型的介子-超子耦合强度,进而影响超子自旋-轨道劈裂的描述.考虑到模型中有效核力取值的不确定性,进一步研究了单Λ超核的粗块及单粒子性质对于超子耦合强度的依赖,探索约束其取值范围的可能方法.具体以16ΛO超核为例,通过改变同位旋标量道超子耦合强度,系统分析了超核能量泛函中核介质与交换项效应.结果显示,超子自旋-轨道劈裂、Dirac有效质量以及超核特征半径等与超子耦合强度比值可能存在一定的线性关联.因此,通过实验或理论对这些物理量做出约束,有望对核介质中超子相关的有效核力给出更强的限制.

外文标题：Hypernuclear Structure in 16ΛO and Its Dependence on Hyperon's Coup-ling Strengths with the Relativistic Hartree-Fock Theory

外文摘要：The research in hypemuclear physics provides crucial information for uncovering the characteristics of baryon-ba-ryon interactions in the nuclear medium and understanding the internal structure of atomic nuclei and neutron stars.Based on the density-dependent relativistic Hartree-Fock(RHF)theory,the ΛN effective interaction in the model is obtained by fitting experimental data of hyperon separation energies for single-Λ hypernuclei.The inclusion of the Fock term alters the dynamic equilibrium of the effective nuclear force in the hyperon channel,resulting in a meson-hyperon coupling strength that differs from the relativistic mean-field model and influences the description of hyperon spin-orbit splitting.Considering the uncer-tainty in the values of the effective nuclear force within the model,further research is conducted to explore the dependence of hypernuclear bulk and single-particle properties on the hyperon coupling strength,aiming to identify possible ways to con-strain its range of values.Taking the 16ΛO hypernucleus as an example,the effects of the nuclear medium and Fock terms are systematically analyzed by adjusting the hyperon coupling strength in the isoscalar channel within the hypernuclear energy functional.The results suggest a possible linear relationship between the ratio of hyperon coupling strength and quantities such as hyperon spin-orbit splitting,Dirac effective mass,and hypemuclear characteristic radius.Therefore,by constraining these quantities through experimental or theoretical means,it is possible to impose stronger limitations on the effective nuclear force associated with hyperons in the nuclear medium.

外文关键词：

single-Λ hypernucleihyperon-nucleon interactioncovariant density functionalFock terms

作者：

丁士缘、杨威、陈兆京、孙保元

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作者单位：

兰州大学教育部稀有同位素前沿科学中心,兰州 730000

兰州大学核科学与技术学院,兰州 730000

关键词：

单Λ超核超子-核子相互作用协变密度泛函交换项

基金：

中央高校基本科研业务费专项中央高校基本科研业务费专项国家自然科学基金资助项目国家自然科学基金资助项目中国科学院战略性先导科技专项

项目编号：

lzujbky-2022-sp02lzujbky-2023-stlt011187515212275111XDB34000000

出版年：

2024

DOI：

10.11804/NuclPhysRev.41.2023CNPC26

原子核物理评论

中国科学院近代物理研究所，中国核物理学会

原子核物理评论

CSTPCD北大核心

影响因子：0.181

ISSN：1007-4627

年,卷(期)：2024.41(1)