Semi-empirical systematics of (n,p) reaction cross-section at 14.5, 20, and 30 MeV

A new semi-empirical formula for the evaluation of the (n,p) reaction cross-section is discussed. The formula was derived using analytical expressions for the calculation of the proton emission spectrum in nuclear reactions within the framework of the preequilibrium exciton model and the evaporation model. A new analysis of experimental (n,p) reaction cross-sections was performed. The experimental data and model calculations were used to get the (n,p) reaction cross-section systematics at 14.5, 20, and 30 MeV. The systematics provides the best description of experimental data compared with formulas proposed earlier by other authors.