Proton-Proton Scattering at 19.8 Mev

Abstract

An experimental measurement of the angular distribution of the scattering of 19.8-Mev protons by protons is described. The scattering material was hydrogen gas and detection was by scintillation counters. The cross section as a function of center-of-mass scattering angle reveals a minimum at 26\ifmmode^\circ\else\textdegree\fi{} where $\frac{d\ensuremath{\sigma}}{d\ensuremath{\omega}}=22.6\ifmmode\pm\else\textpm\fi{}0.3$ mb/steradian. The measurements range from 14\ifmmode^\circ\else\textdegree\fi{} where $\frac{d\ensuremath{\sigma}}{d\ensuremath{\omega}}=59.7\ifmmode\pm\else\textpm\fi{}2.0$ mb/steradian to 90\ifmmode^\circ\else\textdegree\fi{} where $\frac{d\ensuremath{\sigma}}{d\ensuremath{\omega}}=24.6\ifmmode\pm\else\textpm\fi{}0.3$ mb/steradian and include measurements at 15 angles. The phase-shift analysis of the data is as yet incomplete.