Effective Nucleon Masses in Symmetric and Asymmetric Nuclear Matter

الأصل · EN

The momentum and isospin dependence of the in-medium nucleon mass are studied. Two definitions of the effective mass, i.e. the Dirac mass m*D and the nonrelativistic mass m*NR which parameterizes the energy spectrum, are compared. Both masses are determined from relativistic Dirac-Brueckner-Hartree-Fock calculations. The nonrelativistic mass shows a distinct peak around the Fermi momentum. The proton-neutron mass splitting in isospin asymmetric matter is m*D,ₙ <m*D,ₚ and opposite for the nonrelativistic mass, i.e. m*NR,n >m*NR,p, which is consistent with nonrelativistic approaches.