Measurement of NP Elastic Scattering Spin-Spin Correlation Parameters at 484, 634, and 788 Mev.

The spin-spin correlation parameters C _{LL} and C_{SL } were measured for np elastic scattering at the incident neutron kinetic energy of 634MeV. Good agreement was obtained with previously measured data. Additionally, the first measurement of the correlation parameter C _{SS} was made at three energies, 484, 634, and 788 MeV. It was found that the new values, in general, do not agree well with phase shift predictions. A study was carried out to determine which of the isospin -0 partial waves will be affected by this new data. It was found that the ^1P_1 partial wave will be affected significantly at all three measurement energies. At 634 and 788 MeV, the ^3S_1 phase shifts will also change.