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.