On the Scattering of Fast Neutrons by Protons and Deuterons

Abstract

The scattering cross sections of the proton, deuteron, and the carbon nucleus have been determined for 4.1-, 12.5-, and 13.5-Mev neutrons by detecting the corresponding recoil protons. A coincidence set of three proportional counters was used. Similar measurements were made with 14-Mev neutrons from the reactions D+Li. These were detected by the 9.9-min. activity arising from the reaction $_{29}\mathrm{Cu}^{63}+_{0}n^{1}\ensuremath{\rightarrow}_{29}\mathrm{Cu}^{62}+2_{0}n^{1}$. The $n\ensuremath{-}2n$ disintegration of the deuteron has been investigated for 14-Mev neutrons and cross section found to be of the order of 9-4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}26}$ ${\mathrm{cm}}^{2}$. The scattering cross sections at 4.1, 12.5, and 13.5 Mev are, respectively, for H 1.73, 0.69, 0.694\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}24}$ ${\mathrm{cm}}^{2}$; for D 1.79, 0.78, 0.864\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}24}$ ${\mathrm{cm}}^{2}$; for C 1.99, 1.40, 1.23\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}24}$ ${\mathrm{cm}}^{2}$. The experimental results are compared with those of other experimenters and with theoretical predictions.