5Li系统的广义约化R矩阵理论分析

Generalized reduced R-matrix theoretical analysis of 5Li system

  • 摘要: 基于广义约化R矩阵理论,使用RAC程序(R-matrix Analysis code)综合分析5Li系统中所有可以利用的实验数据,给出氘核入射1×10–3~20 MeV,质子入射1×10–3~38 MeV能量范围内全套评价核数据,各反应数据内部自洽。其中积分截面包括3He(d,p)4He、4He(p,d)3He;微分截面包括3He(d,p)4He、4He(p,d)3He、3He(d,d)3He、4He(p,p)4He。RAC的评价结果与实验数据和ENDF/B-VIII.1的评价数据符合良好,结合5Li系统内正逆反应的约束,提高了3He(d,p)4He反应和4He(p,d)3He反应截面评价的可靠性。对于5Li系统重点关注的3He(d,p)4He反应,ENDF/B-VIII.1的评价结果在10 MeV之后与现有实验数据符合较差,RAC给出的评价结果更符合现有的实验数据。

     

    Abstract: Based on the generalized reduced R-matrix theory, the RAC program (R-matrix Analysis Code) is used to perform a comprehensive analysis of all available experimental data for the 5Li system, providing a complete set of evaluated nuclear data in the energy ranges of 1×10–3~20 MeV for deuteron-induced reactions and 1×10–3~34.3 MeV for proton-induced reactions. The evaluated data are internally consistent. The integral cross sections include reactions such as 3He (d,p)4He and 4He (p,d)3He, while the differential cross sections include 3He (d,p)4He, 4He (p,d)3He, 3He (d,d)3He, and 4He (p,p)4He. The RAC evaluation results are in good agreement with both experimental data and ENDF/B–VIII.1 evaluations. By incorporating the constraints of the direct and inverse reactions into the 5Li system, the reliability of the evaluated cross sections 3He (d,p)4He and 4He (p,d)3He has been improved. For the 5Li system, a key focus is the 3He (d,p)4He reaction, for which the ENDF/B–VIII.1 evaluation shows noticeable deviations from existing experimental data beyond 10 MeV, whereas the RAC results are more consistent with current experimental data.

     

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