利用含有 3种对称势形式的同位旋相关的量子分子动力学 ,研究了中能重离子碰撞中原子核阻止的同位旋效应和随入射道条件的系统演化过程 .计算结果表明 ,原子核阻止灵敏地依赖束流能量、碰撞参数、碰撞系统的质量和核子 -核子碰撞截面的同位旋相关性 ,而 3种对称势和碰撞系统的中质比对它的影响不很明显 ,但在大约费米能量以下能区 ,原子核阻止同时依赖于介质中核子 -核子碰撞截面和对称势 .故认为在费米能量以上能区直至 1 50MeV/u ,原子核阻止是提取介质中核子 -核子碰撞截面的一个新的物理观测量 . The isospin-related isospin effect and the evolution of the system with the incident channel conditions were studied by using the isospin-dependent quantum molecular dynamics method with three kinds of symmetric potential forms.The results show that the nuclei prevent sensitive dependence The energy of the beam, the collision parameters, the mass of the collision system and the isospin dependence of the nuclear-nuclear collision cross section. However, the influence of the mass-to-mass ratio of the three symmetric potential and the collision system is not obvious. However, At the same time, the nucleation is inhibited by both the nucleon-nucleon collision cross-section and the symmetry potential in the medium, so it is considered that the nucleus stop is a new physics of the nuclear-nucleon collision cross section in the medium extracted from above the Fermi energy up to 1 50 MeV / u Observations.