HAN Xu; YE Tao; CHEN ZhenPeng; YING YangJun; GUO HaiRui; ZU TieJun

doi:10.7498/aps.75.20251280

Abstract
Based on the generalized reduced R-matrix theory, this work performs a comprehensive analysis of all available experimental data for the ⁶He system using the RAC (R-matrix Analysis Code). A complete set of evaluated nuclear data has been obtained for major reaction channels induced by triton beams in the energy range of 10^-² ~ 20 MeV. The evaluated integral cross sections include T(t,2n)⁴He, T(t,n)⁵He, and T(t,d)⁴H reactions; the differential cross sections include T(t,2n)⁴He, T(t,n)⁵He, T(t,d)⁴H, and T(t,t)T. The evaluation results show good agreement with experimental data and the evaluated data of ENDF/B-VIII.1. In particular, for the T(t,2n)⁴He reaction, the evaluated cross sections are consistent with existing experiments over the full energy range, and a resonance dominated by the 2⁺ level is observed near 2.9 MeV. At 1.9 MeV, where experimental measurements of both integral cross sections and angular distributions are available, the evaluation reproduces both observables well. The combined constraint of integral and differential data significantly improves the stability of R-matrix parameters and the reliability of the evaluation. Based on the global analysis of the ⁶He system, this work also provides supplementary cross section data for the T(t,n)⁵He and T(t,d)⁴H reactions. The results contribute to the nuclear data foundation for fusion-related reactions and lay the groundwork for future joint evaluation with the mirror ⁶Be system.
The datasets presented in this paper, including the ScienceDB, are openly available at https://www.doi.org/10.57760/sciencedb.j00213.00202 (Please use the private access link https://www.scidb.cn/s/7jMryq to access the dataset during the peer review process)

Keywords:
R-matrix theory /

fusion reaction cross sections /

⁶He system /

T(t,2n)⁴He reaction
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