Elastic Proton-Proton Collisions at 6.2 Bev in Nuclear Emulsions

Ilford G-5 emulsions were exposed to the 6.2-Bev proton beam of the Berkeley Bevatron. Of the interactions located, 31 could be classified as elastic collisions of beam protons with free, hydrogen nuclei. After correction for scanning efficiency and background events, an elastic scattering cross section of 8.8±2.0 mb was obtained. The center-of-mass system angular distribution of elastically scattered protons is sharply peaked in the forward and backward direction and is in fair agreement with the prediction of a uniform optical model with a radius of 0.94×${10}^{-13\mathrm{}}$ cm, a phase shift of 0.00 radian, and an opacity of 0.81. The results are compared with those of previous experiments.