The Scattering of Protons by Protons

The cross section for scattering of protons by protons has been measured at angles from 15° to 45° for protons of energies 860, 1200, 1390, 2105 and 2392 kev. Observed scattering cross sections at 15° are close to Mott values for all energies. Ratios of observed cross section to Mott cross section rise with increasing angle and with increasing proton energy. At 45° the ratio rises from 3.90 at 860 kev to 42.9 at 2392 kev. At 1830 kev measurements were made at scattering angles up to 60° and the scattering cross section showed the theoretically expected asymmetry ($cos\theta$) about 45°. As a check on the proton-proton measurements the scattering of protons from argon and krypton was investigated with protons of energies between 850 kev and 2440 kev.