预平衡反应量子多步理论研究  

Research on the Quantum Multistep Theory for Pre-equilibrium Nuclear Reaction

作　　者：苏宗涤[1] 李保现[2] 曹天光[1] 阿不都许库尔 王书暖[1] 黄忠甫[2] 刘建峰[3] 张本爱[4] 朱耀银[5] 李志文[5] 

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413 [2]广西大学物理系,广西南宁530004 [3]郑州大学物理系,河南郑州450004 [4]北京应用物理与计算数学研究所,北京100088 [5]吉林大学物理系,吉林长春130023

出　　处：《原子能科学技术》2002年第6期498-502,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目 (1944 5 0 0 5 ;1945 0 6 7;19975 0 72 ) ;中国工程物理研究院基金资助项目 (970 2 1)

摘　　要：基于Feshbach Kerman Koonin量子多步理论 ,对预平衡反应多步复合公式改进和完善后 ,将其与完全平衡复合核反应截面公式给出一个统一表示。这一公式能和光学模型及Hauser Feshbach理论联系 ,给出了自洽和一致的表述。在多步直接反应理论方面 ,μ步截面能表示为 μ个一步截面的卷积 ,而连续区的一步直接反应截面又可表示为平均DWBA矩阵元和态密度的乘积。为计算一步和多步直接反应截面 ,尝试采用了态密度方法和全微观方法两种方法 ,并得到一些有意义的结论。利用上述工作对一些典型的核反应进行了初步的分析 ,计算结果合理 ,与实验数据相符合。The Feshbach-Kerman-Koonin(FKK) quantum multistep theory of the pre-equilibrium reaction is further improved and perfected. A unified description for the multistep compound(MSC) process of the pre-equilibrium reaction and the compound nucleus(CN) process of full equilibrium reaction can be presented. This formula can integrate MSC and CN theories with the optical model and Hauser-Feshbach formula, and can get self-consistent expression. In multistep direct(MSD) process of the pre-equilibrium reaction, the μ -step cross section can be expressed by the convolution of μ one-step cross section. And the one-step cross section for continuum can be written as the product of an averaged DWBA matrix element and the state density. For calculating the multistep direct reaction cross section, two methods, the state densities and full microscopic model, are used and compared. Some typical experiments are analyzed by using the work mentioned above. The calculated results are reasonable and in good agreement with the experimental data.

关 键 词：量子多步理论 预平衡反应 多步复合理论 多步直接理论 核反应理论 

分 类 号：O571.4[理学—粒子物理与原子核物理]