Distribution in Energy of the Neutrons from the Interaction of 14-Mev Neutrons with Some Elements

The neutron spectra from the interaction of 14-Mev neutrons with a number of elements have been determined by nuclear plate techniques. The plates were exposed to neutrons from the bombardment of a Zr-T target by 200-kev deuterons when the target was as nearly as possible isolated from all scattering material and when the target was surrounded by a spherical shell of the element to be investigated. The variation of $F\left(E_n\right)$, the number of emitted neutrons per unit energy interval with energy ($E_n$), appears to be Maxwellian in the region 0.5 to 4.0 Mev and may be represented by $F\left(E_n\right)d{E}_n=C{E}_n{e}^{-\frac{E_n}{T}}d{E}_n.$