同位旋激发能研究  

On Isospin Excitation Energy

作　　者：李文飞[1] 张丰收[1] 陈列文[1] 

机构地区：[1]兰州重离子加速器国家实验室原子核理论中心

出　　处：《高能物理与核物理》2001年第7期668-673,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 198750 6 8;1984 70 0 2 ) ;国家重点基础研究发展规划 (G2 0 0 0 0 774 0 7);中国科学院基金资助&&

摘　　要：在扩展的Skyrme有效相互作用下 ,利用Hartree Fock理论研究了同位旋激发能与温度、密度的关系 .结果表明同位旋激发能随密度的降低以及温度的增加而降低 .同时研究了对称能与同位旋激发能的关系 ,指出对称能是同位旋激发能的一部分 ,且占相当大的比重 .最后研究了不同的势参数下 ,同位旋激发能随相对中子过剩的变化关系 ,发现同位旋激发能较强地依赖于对称能强度系数 ,而对不可压缩系数以及有效质量不太敏感 .Within the framework of Hartree-Fock theory using the extended Skyrme effective interaction, the isospin excitation energy as a function of relative neutron excess δ was investigated at different temperatures and densities. It was found that the isospin excitation energy decreased with the increment of temperature and/or the decrement of density. We pointed out that the decrement of isospin excitation energy was resulted from the weakening of quantum effect with increment of temperature and/or decrement of density. Meanwhile, the relationship between the isospin excitation energy and the symmetry energy was discussed and found that the symmetry energy was just a part of the isospin excitation energy. With increasing temperature and decreasing density, the contribution of the symmetry energy to the isospin excitation energy becomes more and more important. The isospin excitation energy as a function of relative neutron excess was also investigated using different potential parameters. The result shows that the isospin excitation energy is almost independent of the incompressibility and the effective mass, but strongly depends on the symmetry energy strength coefficient, which indicates that it is possible to extract the symmetry energy of the nuclear equation of state by investigating the isospin excitation energy in experiments.

关 键 词：同位旋激发能 密度 温度 对称能 Skgrme有效相互作用 低能重离子碰撞 复合核 HARTREE-FOCK 

分 类 号：O571[理学—粒子物理与原子核物理]