Quasifree Proton-Neutron and Proton-Proton Scattering at 140 MeV

Measurements of the neutron-proton triple scattering parameters R and A have been performed by scattering a polarized proton beam on a deuterium target. Quasifree proton-neutron events were separated by requiring a time coincidence between the scattered proton and the recoil neutron. The quasifree results were corrected by the method of Cromer and Thorndike (second following paper) to give the following equivalent free neutron-proton results: Measurements were also made requiring a coincidence between the scattered proton and a recoil proton. In this manner, the R and A parameters for quasifree proton-proton scattering in deuterium were obtained. The results are The free n-p values agree with the predictions of the Yale phase-shift solutions YLAN 3 and 3M. The quasifree p-p values agree with free p-p measurements.