利用同位旋相关的输运理论 ,研究了不同中子 -质子比的碰撞系统在中能重离子碰撞过程中 ,原子核阻止的同位旋效应及其对束流能量和碰撞参数的依赖性 .计算表明对于所研究的 4个碰撞系统 ,在从费米能附近到大约1 50MeV/u的较宽入射能量范围内 ,近心碰撞的原子核阻止强烈地依赖于核子-核子碰撞截面的同位旋相关性 ,而对称势对它的影响并不明显 .故原子核阻止是提取介质中核子 -核子碰撞截面的灵敏探针 .研究还表明动量相关势对原子核阻止的重要作用是不可忽略的 The isospin-dependent isospin effect and its dependence on beam energy and collision parameters were studied by using isospin-dependent transport theory in the collision of different neutron-proton collisions with heavy ion collisions For the four collision systems studied, the nuclei of the near-center collision block the isospin dependence strongly dependent on the nucleon-nucleon collision cross section over a wide range of incident energies from near Fermi energy to about 150 MeV / u, The symmetry potential has no obvious effect on it, so it is a sensitive probe to extract the nucleon-nucleon cross-section in the medium.The study also shows that the important role of momentum-related potential in preventing nuclei is not negligible