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中国科学院大学学报 ›› 2003, Vol. 20 ›› Issue (3): 306-308.DOI: 10.7523/j.issn.2095-6134.2003.3.007

• 论文 • 上一篇    下一篇

重离子耗散反应激发函数中的截面涨落

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   

  1. 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
  • 收稿日期:2002-06-13 修回日期:2002-08-05 发布日期:2003-05-10
  • 基金资助:

    国家自然科学基金(10175083,19775057)资助;国家重点基础研究发展规划项目(G2000077401)资助

Fluctuation in the Dissipative Heavy Ion Collisions of FNb

DONG YuChuan1, WANG Qi1, TIAN WenDong1, LI SongLin1, JIANG ZhongHe1, LI ZhiChang2, LU XiuQin2, ZHAO Kui2, FU ChangBo2, LIU JianCheng2, JIANG Hua2, HU GuiQing2   

  1. 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. China Institute of Atomic Energy, Beijing 102413, China
  • Received:2002-06-13 Revised:2002-08-05 Published:2003-05-10

摘要:

完成了两次独立的 19F+93Nb激发函数测量;束流19F8+的入射能量 100~ 108MeV,能量步长 250keV。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;用量子混沌运动中初始条件的极端敏感性解释截面及其涨落的不重复。

关键词: 耗散反应, 涨落不平滑, 截面不重复, 退相干, 量子混沌

Abstract:

Two independent measurements of excitation functions in dissipative collisions of 19 F +93Nb have been carried out at incident energies from 100MeV to 108MeV 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.

Key words: fluctuation, non-self-averaging, non-reproducibility, decoherence, quantum chaos

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