^(19)F+^(93)Nb耗散反应的相互作用时间  

Reaction Time in the ^(19)F+^(93)Nb Dissipative Collision

作　　者：田文栋[1] 王琦[1] 李松林[1] 董玉川[1] 郭忠言[1] 詹文龙[1] 肖国青[1] 李志常[2] 路秀琴[2] 赵葵[2] 符长波[2] 刘建成[2] 姜华[2] 胡桂青[2] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2002年第3期239-244,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 1 9775 0 5 7;1 980 4 0 1 2 );国家重点基础研究发展规划 (G2 0 0 0 0 774 0 0 1 )资助~~

摘　　要：测量了1 9F + 93Nb耗散反应产物的激发函数与角分布 .从角分布的斜率提取的该反应系统的平均寿命在对称性较大的入射系统中反映了系统中耗散产物的特征时间 ;通过能量自关联函数方法从激发函数提取的反应时间不论在对称的还是在非对称的入射系统中都反映了耗散产物的特征时间 .能量自关联函数还可以给出双核系统的转动角速度以及表征转动阻尼的退相干宽度 ,更好地描述双核系统随时间的整个演化过程 .The Angular distribution and excitation function of the disspative products have been measured in the reaction 19F+ 93Nb. The reaction time of the dissipative products is extracted from the angular distribution and compared with that extracted from their energy auto-correlation function. A great difference exists between the reaction times extracted from these two methods. The results obtained from analyzing these two methods in different symmetrical reaction systems show that the reaction time extracted in the more symmetrical system by analyzing the slope of the angular distribution demonstrates the characteristic times of both direct and dissipative products, while the reaction times extracted in the more asymmetrical system only reflects the character of the direct products. But the method of the energy auto-correlation function can give the characteristic time for dissipative products in both symmetrical and asymmetrical system. In addition, the damping rotation feature of the dinuclear system formed in the dissipative reaction can be described by analyzing the energy auto-correlation function.

关 键 词：耗散反应 反应时间 角分布 能量自关联函数 阻尼转动 激发函数 重离子碰撞反应 

分 类 号：O571.4[理学—粒子物理与原子核物理]