Positron-Electron Scattering at 1.3 Mev

Abstract

Using an incident beam energy of 1.3 Mev, the ratio of electron to positron scattering on atomic electrons has been determined for the case where one-half the incident energy is transferred to the atomic electron. The measured ratio is 1.82±0.11, which agrees with the theoretical ratio of 1.83, calculated from the expressions given by Møller and Bhabha when exchange effects are included. The theoretical ratio, excluding exchange effects, is 1.36.