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从 2 5MeV/u4 0 Ar+115In反应前中角区出射碎片的能谱、角分布和Z电荷分布出发 ,讨论了碎片发射机制随出射角和核电荷数Z的渐进变化 ;用改进的量子分子动力学 (MQMD)模型研究了碎片角分布及Z电荷分布 ,理论计算和实验值整体上符合较好 ,但在前角区MQMD模型低估了碎片的产额 ,在中角区对于Z接近弹核的碎片 ,理论计算比实验值偏高 ;碎片产物的角分布及Z电荷分布还与统计模型GEMINI进行了比较 ,发现在前角区平衡蒸发的成分所占比例很小 ,中角区所占的比例有所增加 ,但仍然是较小的比例 .随着碎片核电荷数Z的减小 ,平衡核的蒸发成分逐渐减少 ,非平衡的中速成分逐渐占主导地位
Starting from the energy spectrum, angular distribution and Z charge distribution of the exiting fragments in the mid-angular zone before 25MeV / u4 0 Ar + 115In reaction, the asymptotic evolution of the fragment emission mechanism with the exit angle and the number of nuclear charges Z is discussed. The kinetic model (MQMD) is used to study the angular distribution of fracture and the distribution of Z charge. The theoretical calculation and experimental data are generally in good agreement with each other. However, the MQMD model underestimates the yield of debris in the frontal region. , The theoretical calculation is higher than the experimental value. The angular distribution and Z charge distribution of the fragment product are also compared with the statistical model GEMINI, and the proportion of equilibrium evaporation in the anterior horn is found to be small, But the ratio is still a small proportion.With the reduction of the nuclear charge Z of debris, the evaporation component of the balance nucleus gradually decreases, and the unbalanced medium speed component gradually dominates