Abstract
The momentum and isospin dependence of the in-medium nucleon mass are studied. Two definitions of the effective mass, i.e., the Dirac mass and the nonrelativistic mass which parametrizes 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 and opposite for the nonrelativistic mass, i.e., , which is consistent with nonrelativistic approaches.
- Received 22 February 2005
DOI:https://doi.org/10.1103/PhysRevLett.95.022302
©2005 American Physical Society