Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-09-30
Phys. Rev. C 58 (1998) 2022
Physics
Nuclear Physics
Nuclear Theory
35 pages RevTex, 7 PS figures, replaced by a revised and extended version
Scientific paper
10.1103/PhysRevC.58.2022
We investigate the momentum dependence of the nucleon self-energy in nuclear matter. We apply the relativistic Brueckner-Hartree-Fock approach and adopt the Bonn A potential. A strong momentum dependence of the scalar and vector self-energy components can be observed when a commonly used pseudo-vector choice for the covariant representation of the T-matrix is applied. This momentum dependence is dominated by the pion exchange. We discuss the problems of this choice and its relations to on-shell ambiguities of the T-matrix representation. Starting from a complete pseudo-vector representation of the T-matrix, which reproduces correctly the pseudo-vector pion-exchange contributions at the Hartree-Fock level, we observe a much weaker momentum dependence of the self-energy. This fixes the range of the inherent uncertainty in the determination of the scalar and vector self-energy components. Comparing to other work, we find that extracting the self-energy components by a fit to the single particle potential leads to even more ambiguous results.
Faessler Amand
Fuchs Ch.
Kosov Daniel S.
Waindzoch Thomas
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