Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-10-31
Phys.Rev. C67 (2003) 034002
Physics
Nuclear Physics
Nuclear Theory
35 pages, 1 table, 10 figures
Scientific paper
10.1103/PhysRevC.67.034002
The quantum hadrodynamics (QHD) model with minimal nucleon-meson couplings is generalized by introducing couplings of mesons to derivatives of the nucleon field in the Lagrangian density. This approach allows an effective description of a state-dependent in-medium interaction in the mean-field approximation. Various parametrizations for the generalized couplings are developed and applied to infinite nuclear matter. In this approach, scalar and vector self-energies depend on both density and momentum similarly as in the Dirac-Brueckner theory. The Schr\"{o}diger-equivalent optical potential is much less repulsive at high nucleon energies as compared to standard relativistic mean field models and thus agrees better with experimental findings. The derivative couplings in the extended model have significant effects on properties of symmetric nuclear matter and neutron matter.
Chossy T. v.
Typel Stefan
Wolter Hermann H.
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