核子质量、半径及夸克凝聚的核物质密度依赖性  

Density Dependence of Mass and Radius of a Nucleon and Quark Condensate in Nuclear Matter

作　　者：刘玉鑫[1] 

机构地区：[1]北京大学物理系,北京100871

出　　处：《原子核物理评论》2004年第2期117-120,共4页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10075002;10135030);国家重大基础研究计划(973)基金资助项目(G2000077400);教育部骨干教师基金资助项目~~

摘　　要：简要介绍核物质中核子的质量、半径及夸克凝聚的密度依赖关系基于QCD模型和QCD有效场论研究的现状 ,并具体介绍整体色对称模型 (GCM )的研究结果 .GCM研究表明 ,在小于临界密度的情况下 ,核物质中核子的质量随核物质密度的增大而减小 ,核子的半径和夸克凝聚随核物质密度的增大而增大 .当达到临界密度时 ,核子质量减小为零 ,核子半径变为无限大 ,夸克凝聚突变为零 ,进而提出一个核物质中手征对称性恢复的新机制 .The status of the investigations on the nucleon mass, nucleon radius and quark condensate in the framework of QCD-inspired models and QCD effective field theories is briefly reviewed. The results in the global color symmetry model (GCM) are described a little detailedly. The calculated results indicate that, before the maximal density is reached, the mass of a nucleon in nuclear matter decreases, the radius of a nucleon and the quark condensate increase very slowly, with the increase of the nuclear matter density. As the maximal nuclear matter density is reached, the mass of the nucleon vanishes gradually. The radius becomes infinite and the quark condensate vanishes suddenly. A new mechanism for the chiral symmetry restoration in nuclear matter is proposed.

关 键 词：核子质量 核子半径 夸克凝聚 密度依赖性 手征对称性恢复 临界密度 

分 类 号：O571.21[理学—粒子物理与原子核物理] O572.33[理学—物理]