Nuclear Multiple Plate Camera

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.