Elastic Scattering of 40-Mev Protons byHe4

Abstract

Monoenergetic 39.8-Mev protons, accelerated by the Minnesota linear accelerator, were scattered by purified helium gas. The elastically scattered protons were detected at forty-three angles between 4° and 135° and the results are presented in terms of the absolute differential scattering cross section per unit solid angle in the center-of-mass system of coordinates. Definite minima and maxima in the variation of cross section with angle were observed.