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在5°—140°范围内测量了30MeV／u(40)Ar束流轰击不同靶核（(58)Ni、(64)Ni、(115)In）后出射的中等质量碎片（IMF，Z＝3—19）的角分布．用指数分布函数dσ／dΩ＝N·exp（－θ／α）对出射碎片角分布分角区做了拟合．对3个反应系统分别提取出与相互作用时间有关的衰减因子α和与发射源强度有关的物理量N,讨论了α与N在不同角区与反应系统和出射IMF电荷数的关系．考察了角分布与同位旋自由度和反应系统对称性的关系．
We measured moderate mass fragments (IMF, Z = 1) exiting the target nuclei at (58) Ni, (64) Ni and (115) In after bombardment with 30 MeV / 3-19). The exponential distribution function dσ / dΩ = N · exp (-θ / α) is used to fit the angular distribution of the exit fragments. The decay factor α related to the interaction time and the physical quantity N related to the intensity of the emission source were extracted respectively for the three reaction systems. The relationship between α and N in the reaction system and the number of outgoing IMF charges was discussed. The relationship between angular distribution and isospin degrees of freedom and reaction system symmetry was investigated.