Polarization of protons scattered from C12

Abstract

The polarization of protons elastically scattered from carbon in the energy region between 4.65 and 5.0 Mev has been measured by double scattering from carbon targets. These results, together with the findings at Harwell by Evans and Grace, show that the polarizations predicted from the phase shift analysis are somewhat in error. This disagreement may be explained by making small changes in the splitting of the P- and D-wave phase shifts without seriously affecting the fit to the angular distributions. It was found that in the energy range from 3.0 to 4.0 Mev the D-wave phases required from 1° to 4° additional splitting, while in the range from 4.0 to 5.0 Mev the splitting of the P-wave phases had to be reduced by 4°. These modified phase shifts give a revised contour map of spin polarization versus energy and angle.