On the Momentum Dependence of the Nucleon - Nucleus Optical Potential

Details On the Momentum Dependence of the Nucleon - Nucleus Optical Potential On the Momentum Dependence of the Nucleon - Nucleus Optical Potential

1994-02-23

arxiv.org/abs/nucl-th/9402025v1

Nucl.Phys. A579 (1994) 85-102

Physics

Nuclear Physics

Nuclear Theory

14 pages, TU-940223

Scientific paper

10.1016/0375-9474(94)90795-1

The momentum dependence of the mean-field contribution to the real part of the optical model potential is investigated employing realistic nucleon-nucleon interactions. Within a non-relativistic approach a momentum dependence originates from the non-locality of the Fock exchange term. Deducing the real part of the optical model from a relativistic Dirac Brueckner Hartree Fock approximation for the self-energy of the nucleons yields an additional momentum dependence originating from the non-relativistic reduction of the self-energy. It is demonstrated that large Fock terms are required in the non-relativistic approach to simulate these relativistic features. A comparison is made between a local density approximation for the optical model and a direct evaluation in finite nuclei.

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