Neutron Spectra from Nuclear Reactions Induced by 16-Mev Protons

摘要: 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 bombardment 1-Mev thick targets several elements with 16-Mev protons. number emitted energy $\ensuremath{\epsilon}$ can be represented $\mathrm{nd}\ensuremath{\epsilon}=\mathrm{const} \ensuremath{\epsilon}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{exp}(\ensuremath{-}\frac{\ensuremath{\epsilon}}{T})d\ensuremath{\epsilon} \mathrm{for} \ensuremath{\epsilon}g2 \mathrm{Mev}.$The values $T$ for different is found as follows: ${\mathrm{Be}: T,=2.3\ifmmode\pm\else\textpm\fi{}0.3 \mathrm{Mev} \ensuremath{\epsilon}g4 \mathrm{Mev},}{T,=0.9\ifmmode\pm\else\textpm\fi{}0.1 1l\ensuremath{\epsilon}l4 \mathrm{Mev},}{\mathrm{Al}: T,=1.3\ifmmode\pm\else\textpm\fi{}0.1 \mathrm{Mev},}{\mathrm{Fe}: T,=0.95\ifmmode\pm\else\textpm\fi{}0.1 \mathrm{Mev},}{\mathrm{Rh}: T,=0.85\ifmmode\pm\else\textpm\fi{}0.1 \mathrm{Mev},}{\mathrm{Au}: T,=0.8\ifmmode\pm\else\textpm\fi{}0.1 \mathrm{Mev},}{\mathrm{Tl}: T,=0.78\ifmmode\pm\else\textpm\fi{}0.1 \mathrm{Mev}.}$ From these results the relative level density residual nucleus calculated and compared other experimental data theoretical predictions. ${T}_{\mathrm{exp}}$ are lower than those predicted Weisskopf's statistical model.