Neutron Induced ~ (10) B Of The Nuclear Reaction Model Calculations,

A new model for light nucleus has been developed based on unified Hauser-Feshbach and exciton model. In order to acquire a precise transmission coefficient, the optical model is used in this model to get a set of optimum neutron potential parameters. In the reaction processes of light nucleus the pre-equilibrium emissions dominate the reactions mechanism, while the equilibrium state only gives lightly implement even at low neutron incident energies. The key point in this model is the description of the particle emissions from discrete levels to discrete levels in pre-equilibrium state. In whole reaction processes the angular momentum and parity are conserved and the energy balance is taken into account. To fit the experimental data the level broadening effect and the energy resolution must be considered. Meanwhile, the residual nuclei can decay spontaneously into two clusters or carry out multi-particle break-up process, these are the characteristic for light nucleus reaction. The three-body breakup process was elaborated in detail in this paper. Because of light mass, the recoil effect must be taken into account exactly to maintain the energy balance. The improved pick-up mechanism is still employed to calculate composite particle emission in this model. All kinds of cross sections and energy-angular distribution of outgoing neutrons of the reaction n+10B with incidence energy less than or equal to 20MeV are calculated. The comparisons of total outgoing neutron with the measured experimental data indicate that the model calculations are successful.