Non-equilibrium Statistic Features in Dissipative Heavy Ion Collision ^(27)Al+ ^(27)Al

The excitation functions of dissipative products have been measured in the reaction 27Al+27Al at incident energies from 114 to 127MeV in steps of 200keV. Detection angles vary continuously from 10.4° to 57.4° in laboratory system. An angular coherent width more than 40° in center of mass is obtained. The results from the analysis of excitation functions with nonself-averaging are characterized by a quasi-periodic long-range energy structure embedded in the disorder Ericson fluctuation.

^(27)Al+^(27)Al耗散产物反应时间的提取

用发展了的Ericson统计理论，从27Al＋27Al碰撞的耗散产物的激发函数提取了反应的相互作用时间约4．3×10-21s．

^(27)Al+^(27)Al耗散反应截面涨落的角度关联测量

在2 7Al+ 2 7Al(Elab≈ 1 2 0MeV)耗散反应激发函数涨落的实验研究中 ,首次在较大的角度范围内获得截面涨落的角度关联系数和角度关联函数 .实验结果表明 ,角度关联函数的形状呈现明显的非对称性 ,角度相干宽度至少为 4 0°;截面涨落在前后角区表现出明显不同的角度相关性 .

^(27)Al+^(27)Al耗散反应中激发函数的测量与统计性质分析

通过测量能量从114—120MeV、能量步长为200keV的重离子耗散反应(27)AI＋(27)AI从θ(cm)＝50°-90°的角分布和激发函数，在对所有宏观出射道积分的基础上，分析了重离子耗散反应中激发函数涨落的物理性质．