Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-03-03
Nucl.Phys. A622 (1997) 553-572
Physics
Nuclear Physics
Nuclear Theory
24 pages, Elsevier LaTeX style, 17 figs included
Scientific paper
10.1016/S0375-9474(97)80699-9
In this work we investigate the so-called model-space Brueckner-Hartree-Fock (MBHF) approach for nuclear matter as well as for neutron matter and the extension of this which includes the particle-particle and hole-hole (PPHH) diagrams. A central ingredient in the model-space approach for nuclear matter is the boundary momentum $k_M$ beyond which the single-particle potential energy is set equal to zero. This is also the boundary of the model space within which the PPHH diagrams are calculated. It has been rather uncertain which value should be used for $k_M$. We have carried out model-space nuclear matter and neutron matter calculations with and without PPHH diagrams for various choices of $k_M$ and using several modern nucleon-nucleon potentials. Our results exhibit a saturation region where the nuclear and neutron matter matter energies are quite stable as $k_M$ varies. The location of this region may serve to determine an "optimum" choice for $k_M$. However, we find that the strength of the tensor force has a significant influence on binding energy variation with $k_M$. The implications for nuclear and neutron matter calculations are discussed.
Engvik L.
Hjorth-Jensen Morten
Kuo Thomas T. S.
Osnes E.
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