Abstract
Neutron contribution is an important component of the secondary radiation field. For energies up to 400 MeV encompassing most of the incident spectrum for trapped protons and solar-energetic particle events, energy-angle spectra of secondary neutrons produced from the proton-induced neutron-production reaction are evaluated using the optical model for the direct reactions, the Hauser-Feshbach model for the equilibrium emission, and the exciton model for the pre-equilibrium emission, based on selected reference measurements. As a result, a good agreement has been achieved for the entire emission-energy and angle range, except for slight discrepancies at pre-equilibrium emission energies.
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