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使用Monte-Carlo模拟计算了垒下(16)O+(232)Th系统转移裂变和复合核裂变碎片角分布及角关联.转移过程、熔合过程和裂变过程分别用半经典模型、耦合道模型及鞍点过渡态统计模型进行模拟.考虑了各物理量分布产生的运动学效应及裂前中子发射和裂后碎片粒子蒸发对碎片角分布及角关联的影响.模拟结果和实验测量的分布相一致.使用折叠角技术借助Monte-Carlo模拟区分转移裂变和复合核裂变是可能的.考虑了转移裂变和裂前中子发射的影响,复合核裂变碎片角分布各向异性异常仍然存在.
Monte Carlo simulation was used to calculate the angular distribution and angular distribution of (16) O + (232) Th system transition fission and composite fission fragments. Transfer process, fusing process and fission process were simulated by semi-classical model, coupled-channel model and saddle-point transition state statistical model respectively. The kinematic effect of each physical quantity distribution and the influence of pre-neutron emission and post-fracture debris evaporation on the angular distribution and angular correlation of the debris were considered. The simulation results are consistent with the experimental measurements. Using the folding angle technique it is possible to distinguish between transfer fission and complex fission with Monte-Carlo simulations. Considering the effects of transfer fission and neutron emission before fission, the angular anisotropy of composite fission fragments still exists.