Light charged particle and neutron production in proton- and α-particle-induced reactions on natSi at energies between 20 and 65 MeV

Abstract

Inclusive cross sections ( d 2 σ d Ω d E , d σ d E , d σ d Ω and σ T ) for the production of neutron and light charged particles induced by protons of 26.5, 48.5 and 62.9 MeV and alpha-particles of 25.4, 45.5 and 57.8 MeV on natSi targets have been measured. The secondary particles ( p, d, t, 3He, α, 6Li, 7Li and 7Be) were detected at angles from 10° to 165° in steps of ±10° with respect to the beam axis. Neutrons emitted in these reactions were only recorded in coincidence with, at least, one detected light charged particle. A comparison of the proton- and neutron-induced reactions on Si at E = 62 MeV shows evidence of charge independence of the nuclear force. The proton spectra from the two reactions scale as expected from the difference in proton–neutron and proton–proton quasi-free scattering cross sections. The new data are reproduced with moving source fits and are also compared with state-of-the-art nuclear reaction models. The codes used for this purpose, GNASH and TALYS, consider direct nuclear reactions as well as pre-equilibrium and compound nucleus emission, and were found to reproduce the general features of the experimental data, especially for the ( p , p x ) channel. More detailed comparisons with the data indicate that there is still room for improvement in these codes.