基于核反应蒸发模型和预平衡激子模型,在一些近似条件下得到了入射能量小于20MeV的(n,p)的激发函数解析半经验表达式,靶核在23≤A≤209的范围内,利用大量(n,p)反应的截面实验数据对可调参数进行了研究,得到了参数对靶核的N和Z以及中子入射能量的依赖关系,对得到的参数做了定性的解释,利用普适参数对(n,p)反应的激发函数做了预言,预言值在其误差范围内与实验数据一致。 Based on the nuclear reaction evaporation model and the pre-equilibrium exciton model, the semi-empirical analytical expression of (n, p) excitation function with incident energy less than 20 MeV is obtained under some approximate conditions. The target nucleus is in the range of 23≤A≤209, A large number of (n, p) reaction cross-section experimental data on the adjustable parameters were studied, the parameters of the target nucleus N and Z and neutron incident energy dependence, the parameters were qualitatively explained, the use of P Proper prediction of the excitation function of the (n, p) reaction with the appropriate parameters is in agreement with the experimental data within the error range.