Neutron Spectra from Nuclear Reactions Induced by 16-Mev Protons

The form of neutron spectra from ($p,n$) reactions has been studied by measuring proton recoil tracks in photographic emulsions which were exposed to neutrons produced by bombardment of 1-Mev thick targets of several elements with 16-Mev protons. The number of emitted neutrons with energy $\epsilon$ can be represented by $\mathrm{nd}\epsilon =\mathrm{const} \epsilon ·\exp (-\frac{\epsilon }{T})d\epsilon \mathrm{for} \epsilon >2\mathrm{} \mathrm{Mev}.$