应用改进的量子分子动力学模型,在严格挑选初始核考虑弹靶结构效应的基础上,研究了近 垒和垒上融合反应40,48Ca+90,96Zr．研究表明:4个反应的理论计算截面与实验值很好符合;丰中子反 应40Ca+96Zr的垒下融合截面比其他3个反应有明显增强的现象．为了理解丰中子反应40Ca+96Zr与 40Ca十90Zr相比垒下融合截面增强,而48Ca+96Zr垒下融合截面没有明显增强的原因,进一步分析了4 个反应的融合位垒,中子转移与融合位垒的关系、中子转移与Q值的关系,结果表明:正反应Q值会引 起核子(特别是中子)转移的增强,从而导致动力学融合位垒的下降和垒下融合截面增强． Based on the improved quantum molecular dynamics model and the rigorous selection of the initial nuclei, the structural effects of the projectile are considered, and the fusion reactions 40, 48Ca + 90 and 96Zr on the near and the basal are studied. The results show that the calculated theoretical cross sections of the four reactions are in good agreement with the experimental ones. The fusion cross section of the fortune neutrons 40Ca + 96Zr is obviously enhanced compared with the other three reactions. In order to understand the reason why the confluence of 40Ca + 96Zr and 40Ca-90Zr in the neutron-rich neutron reaction is enhanced and the fusion cross-section in the 48Ca + 96Zr barrier is not obviously enhanced, the fusion barriers of the four reactions, neutron transfer and The relationship between neutron transfer and Q value was studied. The results show that the Q value of positive reaction will lead to the enhancement of nuclear (especially neutron) transfer, resulting in the decrease of kinematic fusion barrier and the enhancement of fusion cross-section .