Generalized reduced R-matrix theoretical analysis of the 5He system

Based on the Generalized reduced R-matrix theory, the RAC program (R-matrix analysis code) is used to analyze the experimental data of all the nuclear reaction channels related to the 5He system. The current calculations provide accurate and reliable evaluation data, and are in good agreement with the experimental data. In this work, self-consistent for each reaction evaluation data are obtained by multi-channel and multi-energy fitting, in particular, the error propagation theory of Generalized Least Squares is used to give the error of the evaluation data and the covariance matrix of the integral cross section. This R-matrix analysis for the 5He system has the following three features. First, for the first time, the error in the evaluation data of the T(d,n)4He reaction cross section and the covariance matrix of the integral cross section are given. Second, we use only one set of R-matrix parameters to depict the reaction cross section of each reaction channel of the 5He system for the whole energy region in our work. Third, in this evaluation, we have taken into account some of the latest measured experimental data, especially after 2000. The T(d,n)4He reaction cross section at 0.1 MeV and below has been carefully studied. The effect of different energy levels in T(d,n)4He has been analyzed, with the energy levels 3/2+ making a major contribution to cross section, and the role of S-wave and D-wave from 3/2- determines the lean forward trend of the angular distributions at 0.01 MeV - 0.1 MeV.