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利用同位旋相关量子分子动力学理论研究了中子晕核引起核反应机制中重要的同位旋效应以提取对称势．因为同位旋相关量子分子动力学理论中的相互作用和介质中核子-核子碰撞截面都灵敏地依赖于碰撞系统的密度分布,本项研究工作基于中子晕核扩展的密度分布．该密度分布包含了反应机制中同位旋效应和疏散内部结构的平均特征．为了弄清楚晕核引起核反应机制的同位旋效应,在完全相同的入射道条件下,比较了由中子晕核炮弹引起的同位旋效应和由相等质量的稳定核炮弹引起同位旋效应．结果发现中子晕核炮弹引起的发射中子-质子比和同位旋分馏比明显大于相等质量稳定弹核产生的结果．因而可以通过理论结果与实验数据的系统比较提取对称势．
The isospin-related quantum molecular dynamics theory has been used to study the important isospin effect of nuclear neutron nucleus mechanism to extract symmetry potential. Because the interactions in the theory of isospin-related quantum molecular dynamics and the nuclear-nucleon collision cross sections in the medium are sensitively dependent on the density distribution of the collision system, this work is based on the density distribution of neutron nucleus expansion. The density distribution contains the average characteristics of the isospin effect and the evacuated internal structure in the reaction mechanism. In order to find out the isospin effect caused by halo nuclei in nuclear reaction mechanism, the isospin effect caused by neutron nucleus shells and the isospin effect caused by stable nuclear shells of equal mass were compared under exactly the same entrance conditions. The results showed that the neutron nucleus shells caused by the launch of neutron - proton ratio and isospin fractionation ratio was significantly greater than the same quality and stability of the results produced by nuclear. Thus the symmetry potential can be extracted by comparing the theoretical results with the experimental data.