Forward angle analyzing power inp→-nandp→-pquasifree scattering at 643 and 797 MeV

Polarized proton beams and a liquid-deuterium target were used to measure the analyzing power for quasifree p{→}-n and p{→}-p scattering in the forward direction at 643 and 797 MeV. Alternate use of a liquid-hydrogen target provided a comparison of free and quasifree p{→}-p scattering. The precision of the data is in general ±{}0.01 to ±{}0.02, although some of the p{→}-p data for 797 MeV are at the precision level of ±{}0.005. For c.m. angles θ*{≥}22^∘{} there is no difference between quasifree and free results at either energy. The data are compared with the predictions of several phase-shift analyses. In a search for more pronounced quasifree scattering effects, a small amount of p{→}-``p'' data were taken with a carbon target.