热核物质中基态关联修正下的单核子势和核子有效质量  

Single nucleon potential and effective mass with ground state correlations in hot nuclear matter

作　　者：陆广成[1] 李增花[1] 左维[1] 罗培燕[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《物理学报》2006年第1期84-90,共7页Acta Physica Sinica

基　　金：中国科学院知识创新工程重要方向性项目(批准号:KJCX2-SW-N02);国家重点基础研究发展规划项目(批准号:G2000077400);国家自然科学重点基金(批准号:10235030;10175082);国家科技部重大前期研究专项基金(批准号:2002CCB00200)资助的课题~~

摘　　要：以有限温度Brueckner-Hartree-Fock(BHF)方法为基础,利用质量算子的空穴线展开,计算了不同温度和密度下的核物质中单核子势和核子有效质量,特别是研究和讨论了基态关联效应和三体核力贡献对热核物质中单核子势的影响.研究表明,基态关联和三体核力对单核子势的密度和温度依赖性均有重要影响.基态关联导致的重排修正具有排斥性,大大减弱了低动量区域单核子势的吸引性,而且基态关联效应对单核子势的贡献随密度增大而增强,随温度升高而减弱.三体核力对基态关联的影响是导致单核子势中重排项贡献减小.在高密度区域包含基态关联效应和三体核力贡献的单核子势的排斥性在整个动量范围内随温度升高而增强.In the framework of the finite temperature Brueckner-Hartree-Fock approach including the contribution of the microscopic three-body force, the single nuclear potential and the nucleon effective mass in hot nuclear matter at various temperatures and densities have been calculated by using the hole-line expansion for mass operator, and the effects of the three-body forces and the ground state correlations on the single nucleon potential have been investigated. It is shown that both the ground state correlations and the three-body force affect considerably the density and temperature dependence of the single nucleon potential. The rearrangement correction in the single nucleon potential is repulsive and it reduces remarkably the attraction of the single nucleon potential in the low-momentum region. The rearrangement contribution due to the ground state correlations becomes smaller as the temperature rises up and becomes larger as the density increases. The effect of the three-body force on the ground state correlations is to reduce the contribution of rearrangement. At high densities, the single nucleon potential containing both the rearrangement correction and the contribution of the three-body force becomes more repulsive as the temperature increases.

关 键 词：有限温度BHF方法 质量算子空穴线展开 重排修正 单核子势 有效质量 

分 类 号：O571.2[理学—粒子物理与原子核物理]