Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-11-16
Phys.Rev. C72 (2005) 065803
Physics
Nuclear Physics
Nuclear Theory
25 pages, 12 figures, to appear in Physical Review C
Scientific paper
10.1103/PhysRevC.72.065803
Properties of symmetric and asymmetric nuclear matter have been investigated in the relativistic Dirac-Brueckner-Hartree-Fock approach based on projection techniques using the Bonn A potential. The momentum, density, and isospin dependence of the optical potentials and nucleon effective masses are studied. It turns out that the isovector optical potential depends sensitively on density and momentum, but is almost insensitive to the isospin asymmetry. Furthermore, the Dirac mass $m^*_D$ and the nonrelativistic mass $m^*_{NR}$ which parametrizes the energy dependence of the single particle spectrum, are both determined from relativistic Dirac-Brueckner-Hartree-Fock calculations. The nonrelativistic mass shows a characteristic peak structure at momenta slightly above the Fermi momentum $\kf$. The relativistic Dirac mass shows a proton-neutron mass splitting of $m^*_{D,n}
Faessler Amand
Fuchs Ch.
van Dalen} N. E. E.
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