Proton-Neutron Triple Scattering at 425 MeV. I

The proton-neutron triple scattering parameters P, D, R, and A have been measured at lab angles of 20^∘{}, 30^∘{}, and 42^∘{} at 425-MeV incident proton energy. Polarized protons were scattered from neutrons in deuterium, and the final proton polarization was measured with a carbon plate wire-spark-chamber system. The recoil neutrons were detected. p-p quasielastic scattering from deuterium was also studied at 30^∘{} and 42^∘{} as a check on the impulse approximation.