p − p Phase Shift Solutions and Depolarization Scattering Parameter at 210 Mev

The 90% polarized proton beam was scattered at 210 Mev from a liquid hydrogen second tanget at an angle taining 0.5% U in the plane of the first polarized scattering, and the polarizations perpendicular to the scattering plane were measured for protons scattering right and left from the second target. Separate values of the depolarization parameter, D( taining 0.5% U ), were calculated for the right and left scatterings from the asymmetry and p-p polarization data and then combined to give D( taining 0.5% U ) = 0.19 combination rat 0.02 and 0.33 combination rat 0.03 for taining 0.5% U = 30 and 60 tained , respectively. These values, plotted on a D( taining 0.5% U ) vs taining 0.5% U graph together with all four (a,b,c,d) sets of phase shifts derived by MacGregor and Moravcsik for p-p scattering at 210 Mev, indicate that the solution b or c is the correct one with b being the more probable. (D. L. C.)