同位旋非对称核物质性质与扩展的BHF方法(Ⅵ)质子和中子平均自由程及其同位旋依赖性

Properties of Isospin Asymmetric Nuclear Matter and Extended BHF Approach (Ⅵ) Proton and Neutron Mean Free Paths and Their Isospin Dependence

在扩展的Brueckner-Hartree-Fock理论框架内,研究了同位旋非对称核物质中质子和中子的平均自由程,着重讨论了其同位旋依赖性。结果表明:随核物质同位旋非对称度的增大,质子平均自由程减小而中子的平均自由程增大。这表明中子滴线附近的原子核表面对中子比对质子更具透明度。还简单讨论了基态关联效应对平均自由程的影响。

Within the isospin dependent extended Brueckner-Hartree-Fock framework, the proton and neutron mean free paths in isospin asymmetric nuclear matter and their isospin denpendence have been investigated. It is shown that as increasing the isospin asymmetry, the proton mean free path decreases while the neutron one increases. This implies that the surface of a neutron-rich nuclei near drip-line will be much more transparent for neutrons than for protons. The density dependence of the mean free paths and the effect of the ground-state correlations on the mean free paths have also been discussed.