Systematics for (n,p) excitation functions in the neutron energy between 13.3 and 15.0 MeV

Systematics of (n,p) excitation functions in the neutron energy between 13.3 and 15.0MeV were studied on the basis of experimental data measured by the Nagoya and Fusion Neutronics Source groups. The empirical formulae of a cross section (0"ʹ4) at 14.0 MeV and a relative slope (S) of excitation functions were deduced. These formulae covered the mass range between 19 and 188. The empirical formula of S was expressed as a function of (N - Z)/A and threshold energy, where N, Z and A are the mass, proton and neutron numbers for the target nuclei, respectively. The empirical formula of 0"4 was expressed by a simple formula with two fitting parameters. By using the proposed empirical formulae, the partial excitation functions between 13 and 15 MeV were reproduced. Comparing the experimental data with the calculated excitation functions, we concluded that the accuracy of the proposed empirical formulae was ± 20%. Copyright