Nuclear Multiple Plate Camera

Abstract

A nuclear multiple plate camera has been devised which permits observations to be made on scattering and reaction processes resulting from the bombardment of gas targets with a charged particle beam. Sixty‐nine photographic plates are held in a rigid geometry which allows simultaneous measurements of interaction differential cross sections at 2.5° intervals from 10° to 170° in the laboratory system. Because of the precision with which the camera is machined, relative cross‐section measurements can be made essentially within the statistical error of the number of particle tracks counted at each angle. As a check of the apparatus, measurements were made on the p—p and p—He⁴ elastic scattering processes. The results are in excellent agreement with previously reported counter data.