Speaker
Description
Based on the statistical theory of light nucleus reactions, the description of the complicated emission processes of proton and light composite charged particles are further improved through considering the effects of Coulomb barriers both in incident and different outgoing reaction channels. Moreover, the analysis of the reaction channels including the sequential and simultaneous emission processes for p + $^7$Li reaction is performed in detail. So the partial spectra of all of outgoing particles are also obtained for different reaction processes. The calculated double-differential cross sections of total outgoing proton, deuteron, and triton at Ep =14 MeV agree well with the available experimental data for different outgoing angles. The ENDF-6 formatted data, which includes all of the reaction cross sections, elastic angular distributions, double-differential cross sections of nucleon, and light composite charged particles for the p + 7Li reaction, are also obtained by PUNF code.
Regarded as important for applications and theoretical studies, the differential cross sections of the emitted triton for the neutron-induced $^6$Li reaction at low incident energies were calculated, based on the zero-range distorted-wave Born approximation theory with the assumption of $^6$Li nucleus consisting of t +$^3$He or d + α. As a function of widths and excited energies of the discrete energy levels, an effective excited energy formula was proposed to describe their partial contributions. In addition, the optical model potential parameters, which had been successfully used to reproduce the double-differential cross sections of the emitted neutrons in our previous works in incident energy range from 5.0 to 20.0 MeV were extended in a low-energy range from 1.0 eV to 3.0 MeV in this paper. The calculated results agreed well with the measured differential cross sections recently published in 2020 and were further consistent with the measured angle-integrated cross sections. This indicates that the knock-out process and heavy-particle knockout process were dominant in an energy range from 1.0 eV to 3.0 MeV, whereas the shapes of the measured angular distributions in incident energy range from 0.1 to 1.0 MeV could be successfully explained by the Hauser-Feshbach model.
References
[1]PHYSICAL REVIEW C 103, 044611 (2021)
[2] PHYSICAL REVIEW C 101, 034616 (2020)