Experiments on Proton-Proton Scattering from 120 to 345 Mev

The differential scattering cross section for elastic collisions of 345-Mev protons with protons has been measured in the angular range 11^∘{} to 90^∘{} (center of mass system). The same cross section has been measured over more limited ranges of angles at lower energies. The cross section (in the center of mass system) at 90^∘{} is remarkably independent of energy. The cross section at 345 Mev is very independent of angle, being close to 3.8×{}10^-27 cm²/steradian (center of mass system). The agreement with existing phenomenological theories based on static potentials is rather poor, especially in the case of scattering at small angles at 345 Mev.