【摘要】 提出双源统计模型并用它研究了 1 58AGeVPb +Pb反应中多粒子产生 .模型很好地描述了实验 ,同时给出一个合理清晰的物理图像 .反应系统由一个热而小的内源和一个大而较凉的外源构成 .外源具有类弹和类靶特征 ,内源具有反应中心区特征 .在freeze out时系统仍处于膨胀中 .更多还原

【Abstract】 The data of multi particle production in 158 A GeV Pb+Pb collisions are analyzed by two source statistical model. The model calculations fit the experimental data very well and supply a reasonable and clear physical picture. The reaction system is composed of a hot, small inner source and a big, cool outer source. The outer source characterizes the projectile like and target like, and the inner source characterizes the central reaction zone. At freeze out, the system is still in expanding.更多还原