Neutron-Proton Elastic-Scattering Spin-Spin Correlation Parameter Measurements Between 500 And 800 Mev .2. Css And Cls At Forward Cm Angles

Results are presented for the spin-spin correlation parameters C(SS) and C(LS) for free np elastic scattering at neutron beam kinetic energies of 484, 634, 720, and 788 MeV and c.m. angles between 25-degrees and 80-degrees. The measurements were performed with a polarized neutron beam and a polarized proton target. These are the first measurements of this type to be reported in the forward angular region with a free polarized neutron beam. The observables C(SS) and C(LS) are both small at all energies, except for C(LS) at 788 MeV, which is larger than phase-shift analysis predictions by more than one standard deviation for most of the measured points.