240-Mev Proton-Deuteron Scattering

A scattering apparatus within the tank of the 130-inch cyclotron has been used to investigate proton-deuteron scattering by measuring coincidences between the proton and deuteron in elastic scattering and the two protons in inelastic scattering. The incident beam has been measured by measuring the ${\mathrm{C}}^{11}$ beta-activity produced in the heavy paraffin targets. The differential elastic scattering cross section has been obtained from 20.5° to 100° for the proton scattering angle in the center-of-mass system. That portion of the inelastic scattering which results in a low energy neutron has been investigated. The differential cross section for this quasi-proton-proton scattering has been obtained at three angles in the center-of-mass system of the two protons. The cross section, equal to about one half of the free proton-proton cross section at 90°, decreases as the proton scattering angle decreases. Maximum energies for the low energy neutron distribution have been obtained at laboratory neutron angles of 0°, 90°, and 180° with respect to the incident proton direction for proton scattering angles of 40°, 67°, and 90° in the $p-p$ center-of-mass system.