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核反应R矩阵理论是研究轻核反应以及中重和重核共振能区核反应的重要理论方法。包含能级矩阵非对角元贡献的完全R矩阵理论在理论上比较严格。根据不同的假定和近似得到不同的R矩阵计算方法。新编的R矩阵程序FDRR包含了4种计算方法,包括约化道多能级Breit-Wigner方法、完全约化R矩阵方法、非对角化能级位移约化R矩阵方法及对角化能级位移约化R矩阵方法。可计算轻核各种两体反应道的截面、角分布。利用FDRR程序对n+6Li反应20MeV以下能区进行理论分析和计算,理论计算结果与实验数据进行了比较分析,理论计算得到的截面和角分布与实验数据符合得很好。
The nuclear reaction R matrix theory is an important theoretical method to study the nuclear reactions in the light nuclear reaction and the medium and heavy nuclear resonance energy regions. The complete R-matrix theory that includes the contributions of non-diagonal elements of the energy level matrix is theoretically rigorous. Different R matrices are calculated according to different assumptions and approximations. The new R matrix program FDRR contains four kinds of calculation methods, including the reduced-track Breit-Wigner method, the fully reduced R matrix method, the non-diagonalized level shift reduced R matrix method and the diagonalization energy Class shift reduction R matrix method. Can calculate the cross-section, angular distribution of a variety of light-nuclear two-body response. The FDRR program is used to analyze and calculate the energy region below 20MeV for n + 6Li reaction. The theoretical calculation results and experimental data are compared and analyzed. The calculated cross sections and angular distribution are in good agreement with the experimental data.