A statistical approach to describe highly excited heavy and superheavy nuclei  

作　　者：陈鹏辉 冯兆庆 李君清 张鸿飞 

机构地区：[1]School of Nuclear Science and Technology, Lanzhou University [2]Institute of Modern Physics, Chinese Academy of Sciences [3]Kavli Institute for Theoretical Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2016年第9期9-14,共6页中国物理C（英文版）

基　　金：Supported by Major State Basic Research Development Program in China(2015CB856903);National Natural Science Foundation of China Projects(11175218,U1332207,11475050,11175074);Youth Innovation Promotion Association of Chinese Academy of Sciences

摘　　要：A statistical approach based on the Weisskopf evaporation theory has been developed to describe the deexcitation process of highly excited heavy and superheavy nuclei, in particular for the proton-rich nuclei. The excited nucleus is cooled by evaporating γ-rays, light particles（neutrons, protons, α etc） in competition with binary fission,in which the structure effects（shell correction, fission barrier, particle separation energy） contribute to the processes.The formation of residual nuclei is evaluated via sequential emission of possible particles above the separation energies.The available data of fusion-evaporation excitation functions in the ^28Si＋^198Pt reaction can be reproduced nicely within the approach.A statistical approach based on the Weisskopf evaporation theory has been developed to describe the deexcitation process of highly excited heavy and superheavy nuclei, in particular for the proton-rich nuclei. The excited nucleus is cooled by evaporating γ-rays, light particles（neutrons, protons, α etc） in competition with binary fission,in which the structure effects（shell correction, fission barrier, particle separation energy） contribute to the processes.The formation of residual nuclei is evaluated via sequential emission of possible particles above the separation energies.The available data of fusion-evaporation excitation functions in the ^28Si＋^198Pt reaction can be reproduced nicely within the approach.

关 键 词：excited nucleus structure effects Weisskopf evaporation theory fusion-evaporation reactions 

分 类 号：O571[理学—粒子物理与原子核物理]