Neutron Emission Probabilities from the Interaction of 14-Mev Neutrons with Be, Ta, and Bi

Abstract

The spatial and spectral distributions of the neutrons from 14-Mev neutron interactions with Ta and Bi have been obtained by using nuclear emulsion detectors in conjunction with a neutron collimator. These results indicate that roughly 85 to 90% of the interactions proceed via compound-nucleus formation while approximately 10 to 15% proceed by "direct" interactions. The space-integrated neutron spectrum has been obtained for Be by means of a sphere experiment. Cross sections for neutron emission, nonelastic scattering, ($n, {n}^{\ensuremath{'}}$), and ($n, 2n$) are derived for all three elements.