基于自己发展的同位旋相关的量子分子动力学模型,采用同位旋自由度研究了4个质量同为96的系统在入射能量为100和400AMeV时的反应趋平衡问题。发现出射的自由中子-质子差的快度分布是有关同位旋自由度的测量反应趋平衡的敏感量。通过分析出射核子、轻带电粒子和中等质量碎片的N/Z比,发现在多重碎裂过程存在记忆效应。当入射能量从100增加到400 AMeV时,中等质量碎片的N/Z有比较大的下降,这体现在中等质量碎片同位素 Based on the isospin-related quantum molecular dynamics model developed by ourselves, the isospin-degree of freedom is used to study the equilibrium of reactions in four systems with the same mass of 96 at incident energies of 100 and 400 AMeV. It was found that the fast distribution of free-neutron-proton exiting is a sensitive measure of the equilibrium reaction of isospin-DOF measurements. By analyzing the N / Z ratio of exiting nucleons, light charged particles and medium-quality fragments, it is found that there is a memory effect in the multiple fragmentation process. As the incident energy increases from 100 to 400 AMeV, the N / Z of medium-quality fragments decreases considerably, as evidenced by the medium-quality fragment isotopes