预平衡反应多步复合理论和复合核反应理论的统一表示  

A Unified Expression for Multistep Compound Theory of Pre-equilibrium Reaction and Compound Nucleus Reaction Theory

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

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

出　　处：《高能物理与核物理》2003年第6期498-502,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 19975 0 72 );中国工程物理研究院基金 ( 970 2 1)资助~~

摘　　要：将Feshbach Kerman Koonin(FKK)量子多步复合 (MSC)理论推广至核子自旋为 1 2 ,靶核自旋任意 ,在j j表象严格处理角动量耦合 ,得到自旋为 1 2的FKK MSC公式 .进一步用光学模型吸收代替门态强度函数 ,以及用复合核衰变宽度代替平衡态的逃逸宽度 ,给出了FKK MSC理论与复合核反应Hauser Feshbach模型 (HFM)的一个统一表达式 .这一公式将MSC和HFM与光学模型相联系 ,对核反应给出自洽和一致的描述 .利用上述工作对一些典型的核反应实验进行了初步地分析 ,计算结果合理 ,与实验数据符合尚好 .The Feshbach-Kerman-Koonin multistep compound theory (MSC)of the pre-equilibrium reaction is further improved and perfected. The nucleon is treated as a spin-half particle, target nucleus is allowed to a non-zero spin and the angular momentum coupling is treated rigorously. The expressions of the double-differential cross section and transition matrix elements are obtained in j-jrepresentation. The strength function of doorway state is replaced by optical model absorption, and the escape width is replaced by decay width of Hauser-Feshbach model (HFM)in the r-space where full equilibrium has been established. A unified expression for MSC of pre-equilibrium reaction and HFM of compound nucleus reaction is presented. This formula can integrate MSC and HFM with the optical model and can give self-consistent and uniform description for nuclear reaction. Some typical data are analyzed by using the work mentioned above. The calculated results are reasonable and in good agreement with the experimental data.

关 键 词：预平衡反应 量子多步复合理论 复合核反应理论 光学模型 原子核反应 

分 类 号：O571.4[理学—粒子物理与原子核物理]