The on-shell properties of the nucleon effective mass in asymmetric nuclear matter are investigated in the framework of an extended Brueckner-Hartree-Fock (BHF) approach.The proton and neutron effective masses in neut...The on-shell properties of the nucleon effective mass in asymmetric nuclear matter are investigated in the framework of an extended Brueckner-Hartree-Fock (BHF) approach.The proton and neutron effective masses in neutron-rich nuclear matter are predicted by including both the effect of ground state correlations and the threebody force (TBF) rearrangement contribution.Within this framework,the neutron effective mass is predicted *to be larger than the proton one in neutron-rich nuclear matter,i.e.,m*n ≥ m*p.The effect of ground state correlations turns out to be dominated at low densities and it leads to a strong enhancement of the effective mass.The TBF rearrangement contribution becomes predominant over the effect of ground state correlations at high densities and it reduces remarkably the absolute magnitude of the isospin splitting of the neutron and proton effective masses in neutron-rich matter at high densities.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11175219 and 10875151the Knowledge Innovation Project of Chinese Academy of Sciences(KJCX2-EW-N01)the Chinese Academy of Sciences Visiting Professorship for Senior International Scientists(2009J2-26).
文摘The on-shell properties of the nucleon effective mass in asymmetric nuclear matter are investigated in the framework of an extended Brueckner-Hartree-Fock (BHF) approach.The proton and neutron effective masses in neutron-rich nuclear matter are predicted by including both the effect of ground state correlations and the threebody force (TBF) rearrangement contribution.Within this framework,the neutron effective mass is predicted *to be larger than the proton one in neutron-rich nuclear matter,i.e.,m*n ≥ m*p.The effect of ground state correlations turns out to be dominated at low densities and it leads to a strong enhancement of the effective mass.The TBF rearrangement contribution becomes predominant over the effect of ground state correlations at high densities and it reduces remarkably the absolute magnitude of the isospin splitting of the neutron and proton effective masses in neutron-rich matter at high densities.
