利用镜像对核~(32)Ar-~(32)Si约束核物质状态方程  

Constraining the Equation of State of Nuclear Matter with the Mirror-pair nuclei 32Ar-32Si

作　　者：安荣 马小荣[1] 孙帅 蒋翔 An Rong;Ma Xiaorong;Sun Shuai;Jiang Xiang(School of Physics,Ningxia University,Yinchuan 750021,China;Key Laboratory of Beam Technology of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China;College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]宁夏大学物理学院,宁夏银川750021 [2]北京师范大学核科学与技术学院,射线束技术教育部重点实验室,北京100875 [3]深圳大学物理与光电子工程学院,广东深圳518060

出　　处：《宁夏大学学报（自然科学版）》2024年第3期233-237,共5页Journal of Ningxia University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11705118)。

摘　　要：对称能的密度依赖行为是描述不对称核物质性质的关键物理量,它与核物质状态方程中同位旋矢量相互作用相关.理论研究表明,对称能斜率与镜像对核电荷半径差值之间存在很好的线性关系,这为约束对称能斜率提供了一种可选择的方法.最新的实验探测给出了原子核~(32)Si电荷半径的大小,并与现有的原子核~(32)Ar组成镜像对核,这为限制核物质状态方程提供了实验基础.通过球形基下的协变密度泛函理论和Skyrme密度泛函理论计算了~(32)Ar和~(32)Si电荷半径的数值,分析了镜像对核~(32)Ar-~(32)Si电荷半径差值与饱和点密度处对称能斜率之间的线性关系.最后,基于最新的镜像对核实验数据得到了比较软的核物质状态方程,这与多数理论模型的结果是一致的.The density-dependence of symmetry energy,which is associated with the isospin interactions in the equation of state of nuclear matter,plays a vital role in describing the properties of asymmetric nuclear matter.Theoretical researches suggest that the highly linear correlations can be observed between the difference of the charge radii of mirror-pair nuclei and the slope parameter of symmetry energy.This may provide an alternative approach to constrain the symmetry energy slope.The charge radius for 32Si has been detected by the latest experiment,combining the known charge radius of 32Ar,a new mirror nuclei pair is produced.This provides the fundamental database for constraining the equation of state of nuclear matter.The charge radii of 32Ar and 32Si have been calculated by the covariant and Skyrme density functional theories with spherical basis,respectively.The linear correlations between the difference of the charge radii of mirror-pair nuclei 32Ar-32Si and the symmetry energy slope at the saturation density have been analyzed.The calculated results suggest that the soft equation of state of nuclear matter is obtained through the latest database,and this is in accord with the most theoretical results.

关 键 词：密度泛函理论 镜像核 电荷半径 对称能斜率 

分 类 号：O571.6[理学—粒子物理与原子核物理]