^(4)He系统的广义约化R矩阵理论分析  

A Theoretical Analysis of Generalized Reduced R-Matrix of ^(4)He System

作　　者：周历波 叶涛[2] 王佳[2] 孙伟力[2] ZHOU Libo;YE Tao;WANG Jia;SUN Weili(Graduate School,China Academy of Engineering Physics,Beijing,China;Institute of Applied Physics and Computational Mathematics,Beijing,China)

机构地区：[1]中国工程物理研究院研究生院,北京100088 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《计算物理》2022年第6期631-640,共10页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(91126017,11175233);清华大学自主科研项目(20111081104);科学挑战项目(TZ2018001,TZ2018005)资助

摘　　要：以广义约化R矩阵理论为基础,运用RAC程序(R-matrix analysis code)综合分析有关^(4)He系统的所有核反应的实验数据,给出从0~30 MeV范围内一套完整的评价值,各反应数据内部自恰。其中积分截面的拟合包括^(3)He(n,total)、^(3)He(n,n)^(3)He、^(3)He(n,d)D、^(3)He(n,p)T、D(d,n)^(3)He、D(d,p)T和T(p,n)^(3)He,同时给出相应的误差矩阵;天体物理学S因子的拟合包括D(d,n)^(3)He和D(d,p)T;微分截面的拟合包括^(3)He(n,n)^(3)He、^(3)He(n,p)T、D(d,d)D、D(d,n)^(3)He和D(d,p)T。所有的拟合结果与实验数据和主流评价数据符合良好。在低能部分,提高了D(d,n)^(3)He反应和D(d,p)T反应各自积分截面的精确度。在高能部分,将4He系统的评价数据进行了扩展。Based on a generalized reduced R-matrix theory,we analyze comprehensively all experimental data of nuclear reactions of 4He system with RAC(an R-matrix analysis code).A complete set of evaluations from 0 MeV or thresholds to 30 MeV is given.The data for each reaction is internally self⁃consistent.The fitting integral cross sections include those of^(3)He(n,total),^(3)He(n,n)^(3)He,^(3)He(n,d)D,^(3)He(n,p)T,D(d,n)^(3)He,D(d,p)T,and T(p,n)^(3)He,with corresponding error matrix.The fitting astrophysical Sfactors include those of D(d,n)^(3)He and D(d,p)T.The fitting differential cross sections include those of^(3)He(n,n)^(3)He,^(3)He(n,p)T,D(d,d)D,D(d,n)^(3)He,and D(d,p)T.All fitting results are in good agreement with experimental data and mainstream evaluations.In the low⁃energy part,accuracy of integral cross⁃sections of D(d,n)^(3)He and D(d,p)T are improved,respectively.In the high⁃energy part,the evaluation data of^(4)He system are extended.

关 键 词：R矩阵理论 核反应截面 核数据评价 ^(4)He系统 D(d n)^(3)He反应 

分 类 号：O571.421[理学—粒子物理与原子核物理] O571.422[理学—物理]