测量了 ２５ＭｅＶ／ｕ４０　Ａｒ＋１１５　Ｉｎ，５８　Ｎｉ，２７　Ａ１反应前中角区出射碎片的角分布和 元素 Ｚ分布．用改进的量子分子动力学（ＭＱＭＤ）模型研究了碎片的角分布和 Ｚ 分布．理论计算值和实验值整体上符合得很好，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，理论计算值比实验值偏高．碎 片产物的角分布和Ｚ分布还与统计蒸发模型ＧＥＭＩＮＩ进行了比较，结果表明，在 前角区平衡蒸发成份所占的比例很小，中角区所占的比例有所增加，但仍然是较 小的比例．同时发现平衡蒸发成份随着出射碎片核电荷数Ｚ的减小而逐渐减 少． The angular distribution and element Z distribution of the exiting debris in the mid-angular zone before 25MeV / u40 Ar + 115In, 58Ni, 27Al reaction were measured. The angular distribution and Z distribution of the fragments were studied with a modified Quantum Molecular Dynamics (MQMD) model. However, in the front corner, the MQMD model underestimates the yield of debris. In the mid-angle region, the theoretical calculated value is higher than the experimental value for the fragment near Z axis. The angular distribution and Z distribution of the fragment products were also compared with the statistical evaporation model GEMINI. The results showed that the proportion of evapotranspiration in the anterior horn area was small, while that in the mid-angle area increased, Small proportion. At the same time, it was found that the equilibrium evaporation component decreased gradually with the decrease of the number of nuclear charge Z of the outgoing debris.