重离子耗散反应激发函数中的截面涨落  

Fluctuation in the Dissipative Heavy Ion Collisions of ^(19)F+^(93)Nb

作　　者：董玉川[1] 王琦[1] 田文栋[1] 李松林[1] 江中和[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：《中国科学院研究生院学报》2003年第3期305-308,共4页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：国家自然科学基金(10 175 0 83;19775 0 5 7)资助;国家重点基础研究发展规划项目(G2 0 0 0 0 7740 1)资助

摘　　要：完成了两次独立的 1 9F + 93Nb激发函数测量;束流 1 9F8+的入射能量 1 0 0～ 1 0 8MeV,能量步长 2 5 0keV。两次测量的宏观条件完全相同,实验结果有近 1/3的相同能量点所对应的反应截面及其涨落不重复。在双核系统中引入宇称和自旋的退相干描述能量自关联函数中准周期性的衰减结构;Two independent measurements of excitation functions in dissipative collisions of 19 F+ 93 Nb have been carried out at incident energies from 100 MeV to 108 MeV in steps of 250 keV. The experimental conditions were kept to be identical in both measurements. The data indicate non reproducibility of the non self averaging oscillating cross sections. The quasi periodic structure in the energy autocorrelation functions is described by means of the concept of parity and spin decoherence in the intermediate dinuclear system. The non reproducibility of the cross sections is interpreted by the extreme sensitivity of initial condition in the quantum chaotic motion.

关 键 词：耗散反应 涨落不平滑 截面不重复 退相干 量子混沌 

分 类 号：O571.423[理学—粒子物理与原子核物理] O571.413[理学—物理]