在非相对论能量下介质中的核子－核子碰撞截面

In Medium Nucleon-Nucleon Cross Section at Nonrelativistic Energy Region

在非相对论能量下，采用Ｓｋｙｒｍｅ有效相互作用，计算了在核介质中的核子－核子（Ｎ－Ｎ）碰撞截面，研究了它与能量及密度的依赖关系，以及不同Ｓｋｙｒｍｅ参数对所计算截面的影响．发现在低密度时，介质中的核子－核子碰撞截面大于经Ｐａｕｌｉ修正后的自由核子一核子碰撞截面．而当高密度时，总会在高于某一能量以后，介质中的Ｎ－Ｎ碰撞截面大于经Ｐａｕｌｉ修正后的自由Ｎ－Ｎ碰撞截面．

In this paper,the nucleon-nucleon elastic cross section σnn(E,ρ) in medium has been calculated and discussed at nonrelativistic energy region by using Skyrme interaction. It is found that under Pauli correction σnn in medium is larger than free nucleon-nucleon cross section for lower densities,and σnn in medium above spacial energy is larger than free nucleon-nucleon cross section for higher densities.