Decomposition of the equation of state of asymmetric nuclear matter into different spin-isospin channels  

作　　者：左维 周善贵 李君清 赵恩广 Scheid W 

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences [2]Institute of Theoretical Physics,Chinese Academy of Sciences [3]Institute fr Theoretische Physik der Justus-Liebig-Universitt,D-35392 Giessen

出　　处：《Chinese Physics C》2009年第7期547-551,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10875151, 10575119, 10435010, 10575036, 10705014, 10811130077);Knowledge Innovation Project(KJCX3-SYW-N2) of Chinese Academy of Sciences, Major State Basic Research Developing Program of China (2007CB815004);CAS/SAFEA International Partnership Program for Creative Research Teams (CXTD-J2005-1), and DFG of Germany

摘　　要：We investigate the equation of state of asymmetric nuclear matter and its isospin dependence in various spin-isospin ST channels within the framework of the Brueckner-Hartree-Fock approach extended to include a microscopic three-body force（TBF） . It is shown that the potential energy per nucleon in the isospinsinglet T = 0 channel is mainly determined by the contribution from the tensor SD coupled channel. At high densities,the TBF effect on the isospin-triplet T = 1 channel contribution turns out to be much larger than that on the T =0 channel contribution. At low densities around and below the normal nuclear matter density,the isospin dependence is found to come essentially from the isospin-singlet SD channel and the isospin-triplet T = 1 component is almost independent of isospin asymmetry. As the density increases,the T = 1 channel contribution becomes sensitive to the isospin asymmetry and at high enough densities its isospin dependence may even become more pronounced than that of the T = 0 contribution. The present results may provide some microscopic constraints for improving effective nucleon-nucleon interactions in a nuclear medium and for constructing new functionals of effective nucleon-nucleon interaction based on microscopic many-body theories.We investigate the equation of state of asymmetric nuclear matter and its isospin dependence in various spin-isospin ST channels within the framework of the Brueckner-Hartree-Fock approach extended to include a microscopic three-body force（TBF） . It is shown that the potential energy per nucleon in the isospinsinglet T = 0 channel is mainly determined by the contribution from the tensor SD coupled channel. At high densities,the TBF effect on the isospin-triplet T = 1 channel contribution turns out to be much larger than that on the T =0 channel contribution. At low densities around and below the normal nuclear matter density,the isospin dependence is found to come essentially from the isospin-singlet SD channel and the isospin-triplet T = 1 component is almost independent of isospin asymmetry. As the density increases,the T = 1 channel contribution becomes sensitive to the isospin asymmetry and at high enough densities its isospin dependence may even become more pronounced than that of the T = 0 contribution. The present results may provide some microscopic constraints for improving effective nucleon-nucleon interactions in a nuclear medium and for constructing new functionals of effective nucleon-nucleon interaction based on microscopic many-body theories.

关 键 词：equation of state asymmetric nuclear matter decomposition into spin-isospin channels three-body force Brueckner-Hartree-Fock approach 

分 类 号：O571[理学—粒子物理与原子核物理]