对称核物质中核子-核子散射截面的研究

梁栋; 左维; 董建敏

doi:10.11804/NuclPhysRev.29.02.123

对称核物质中核子-核子散射截面的研究

Nucleon-nucleon Cross Sections in Isospin Symmetric Nuclear Matte

摘要

摘要: 在扩展的Brueckner-Hartree-Fock (BHF)理论框架下，采用Argonne V₁₄两体相互作用势研究了对称核物质中核子-核子散射的总截面和微分截面，分别讨论了三体核力(TBF)重排效应和基态关联效应对全同和非全同核子散射截面的影响。计算表明：低动量区域的基态关联效应会导致介质中核子-核子散射截面的增大；而随着密度的增加，TBF重排效应的逐渐加强会减小介质中的核子-核子散射截面。 The nucleonnucleon cross sections in symmetric nuclear matter were investigated in the framework of the extended Brueckner-Hartree-Fock(BHF) approach with Argonne V₁₄ two body interaction. The influences of the ground state correlation and the rearrangement contribution of the threebody force (TBF) on the cross section have been obtained and discussed separately for identical and nonidentical nucleon collisions. It is shown that the magnitudes of the cross section are increased by the effects of the ground state correlation in low momentum transfers，and are suppressed in medium with increasing density when the rearrangement contribution of the TBF force is considered.
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Abstract: The nucleonnucleon cross sections in symmetric nuclear matter were investigated in the framework of the extended Brueckner-Hartree-Fock(BHF) approach with Argonne V₁₄ two body interaction. The influences of the ground state correlation and the rearrangement contribution of the threebody force (TBF) on the cross section have been obtained and discussed separately for identical and nonidentical nucleon collisions. It is shown that the magnitudes of the cross section are increased by the effects of the ground state correlation in low momentum transfers，and are suppressed in medium with increasing density when the rearrangement contribution of the TBF force is considered.
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