热核物质中单核子势的重排项贡献和三体核力效应

在包含三体核力的有限温度Brueckner-Hartree-Fock理论方法基础上, 利用质量算子的空穴线展开, 研究了热核物质中基态关联所导致的对单核子势的重排修正项的密度和温度依赖性, 并讨论了三体核力对重排项的影响. 结果表明：单核子势的重排项贡献具有较强的密度和温度相关性, 重排项贡献随密度增加而增强并随温度升高而减弱. 在计算中引入三体核力会在一定程度上抑制基态空穴关联 效应, 从而导致单核子势的重排项贡献减小, 而且三体核力对重排项贡献的影响随密度增大而增强.

Rearrangement Contribution to Single Nucleon Potential in Hot Nuclear Matter and Three-Body Force Effect

Based on the finite temperature Brueckner-Hartree-Fock approach including a microscopic three-body force, the rearrangement correction to the single nucleon potential in hot nuclear matter, and its density and temperature dependence have been investigated by using the hole-line expansion for the mass operator. It turns out that the rearrangement contribution due to ground state correlations is repulsive and it depends sensitively on both density and temperature. The rearrangement contribution becomes larger as the density increases and becomes smaller as the temperature rises up. The three-body force affects considerably the rearrangement contribution of the single nucleon potential and its effect increases with density. Inclusion of the three-body force in the calculation reduces the ground state correlations especially in the high density region and consequently makes the rearrangement contribution smaller.