The Theoretical Calculations. Neutron Induced <sup> The 112 120 </ Sup> Sn Reaction

All cross sections of neutron induced reaction, elastic scattering angular distribution, neutron energy spectrum and double differential cross sections were calculated by using optical model and the semi-classical model of multi-step nuclear reaction processes based on the Hauser-Feshbach and exciton model in the energy region up to 20MeV. Optical model was used to obtain optical potential parameters and calculated emission rates of all kinds of particles. In calculating, we found the equilibrium processes were dominative and the pre-equilibrium processes were subordinate for reaction processes of n+112120Sn at incident neutron energies below 20 MeV. Since the recoil effect is taken into account, the energy for whole reaction processes is balance. The calculated results indicate the theoretical results are in good agreement with existed experimental data, and it is successful to predict nuclear reaction by using optical model and the semi-classical model of multi-step nuclear reaction processes in theory.â– ENKey words : optical model;Hauser-Feshbach theory;exciton model;equilibrium processes;pre-equilibrium processes...