180≤A≤210核区快中子诱发γ产生机制的巨偶极共振模型研究  

Study on the Giant Dipole Resonance Model for γ Production Mechanisms Induced by Fast Nutrons in the Nuclear Mass Region 180≤A≤210

作　　者：刘建峰[1] 贾敏[1] 赵维娟[1] 

机构地区：[1]郑州大学物理系,郑州450052

出　　处：《高能物理与核物理》2003年第5期430-435,共6页High Energy Physics and Nuclear Physics

基　　金：中国核工业总公司核数据经费资助~~

摘　　要：在 1 8 0≤A≤ 2 1 0核质量区研究快中子诱发γ射线产生机制中与巨偶极共振模型相关的问题 ,包括 (n ,γ)反应与 (n ,n′γ)反应中级联γ退激过程γ射线强度函数的差异和 (n ,γ)反应中直接 -半直接辐射俘获与复合核统计过程反应截面之比随入射能量、核质量数和核壳层的变化规律 .据此 ,中子入射能量选在 1— 2 0MeV ,给出了1 81 Ta及1 97Au和2 0 8Pb的理论计算结果及与实验数据的比较 。The subjects related to the giant dipole resonance model for the γ production mechanisms induced by fast neutrons have been studied in the nuclear mass region 180≤A≤210.It contains the difference between the γ ray strength functions of the cascad γ deexcitation processes in the (n,γ)and (n,n′γ)reactions as well as the variation tendency of the reaction cross section ratios between the direct-semidirect radiative captures and the compound nucleus statistical processes with the incident energies, nuclear mass numbers and the nuclear shells. The numerical calculations and the comparisons with the experimental values for 181 Ta, 197 Au and 208 Pb have been done in the nentron incident energy region from 1 MeV to 20 MeV. The analyses and discussions to the results have also been given.

关 键 词：巨偶极共振模型 直接—半直接辐射俘获 复合核统计过程 (n γ)反应 (n n’γ)反应 非统计效应 快中子诱发γ射线 产生机制 

分 类 号：O571.2[理学—粒子物理与原子核物理]