Asymmetric Nuclear Matter in the Relativistic Brueckner Hartree Fock approach

Details Asymmetric Nuclear Matter in the Relativistic Brueckner Hartree Fock approach Asymmetric Nuclear Matter in the Relativistic Brueckner Hartree Fock approach

1997-07-14

arxiv.org/abs/nucl-th/9707017v1

Phys.Rev.C57:3099-3107,1998

Physics

Nuclear Physics

Nuclear Theory

18 pages Revtex with 5 postscript figures, submitted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.57.3099

We present a calculation of asymmetric nuclear matter properties in a relativistic Brueckner Hartree Fock framework. Following other calculations the components of the self-energies are extracted by projecting on Lorentz invariant amplitudes. It is shown that for asymmetric nuclear matter one needs a sixth invariant. We present a set of invariants which in the limit of symmetric nuclear matter reduces to the conventional set. We argue that the existence of such a properly behaving set is also crucial for the application of the projection method in symmetric nuclear matter. Results for the equation of state and other observables are presented. Special attention is payed to an analysis in terms of mean-field effective coupling constants. Apart from the usual ones we also find significant strength in the isovector scalar channel, which can be interpreted as an effective $\delta$-meson.

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