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A New Decomposition Approach of Dirac Brueckner Hartree-Fock
G Matrix for Asymmetric Nuclear Matter |
| LIU Ling;MA Zhong-Yu |
| China Institute of Atomic Energy, Beijing 102413
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| Cite this article: |
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LIU Ling, MA Zhong-Yu 2002 Chin. Phys. Lett. 19 190-193 |
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Abstract Asymmetric nuclear matter is investigated by the Dirac Brueckner Hartree-Fock (DBHF) approach with a new decomposition of the Dirac structure of nucleon self-energy from the G matrix. It is found that the isospin dependence of the scalar and vector potentials is relatively weak, although both potentials for neutron(proton) become deep(shallow) in the neutron rich nuclear matter. The results in asymmetric nuclear matter are rather different from those obtained by a simple method, where the nucleon self-energy is deduced from the single particle energy. The nuclear binding energy as a function of the asymmetry parameter fulfills the empirical parabolic law up to very extreme isospin asymmetric nuclear matter in the DBHF approach. Behaviour of the density dependence of the asymmetry energy is different from those obtained by non-relativistic approaches, although both give similar asymmetry energy at the nuclear saturation density.
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| Keywords:
21.65.+f
21.30.Fe
21.10.Dr
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Published: 01 February 2002
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