Neutron-induced silver isotope (107Ag) under 20 MeV energy: Feshbach-Kerman-Koonin (FKK) theory case

The double-differential cross-sections (DDCS) and angular distributions for the neutron-induced reactions on the 107 Ag isotope were calculated at incident energies of 3, 5, 10, and 15 MeV within the pre-equilibrium region using the Kalbach model implemented in the PRECO-6 code and in conjunction with Feshbach-Kerman-Konnin statistical theory. Emitted nucleons’ total cross-sections were decomposed into direct (MSD) and compound (MSC) multistep components following Kalbach systematics expressed as d 2 σ/dΩ.dE . Results show that the d 2 σ/dΩ.dE a☺nd angular distribution for 107 Ag decrease systematically as the incident neutron energy increases, with markedly clearer structures for light ejectiles (neutrons and protons) than for heavy composite particles (deuterons, tritons, 3 He, and α particles). The latter also requires higher incident energies and exhibits spectral gaps under the present conditions. For two channels (n, n) and (n, p), calculations indicate that existing experimental data are not yet sufficient to firmly establish the energy dependence of the cross-sections, underscoring the need for precise measurements to constrain pre-equilibrium model parameters.