Polarization of 220-Mev Protons Elastically Scattered from Carbon

Protons polarized to 89% have been scattered from ${\mathrm{C}}^{12}$ in the laboratory angular range from 4 to 40 degrees. Data were obtained on angular distributions and asymmetries in three closely spaced energy channels spanning the high-energy tail of the incident spectrum. In spite of the great width of this spectrum, it was possible to extrapolate the data so as to give fair separation of elastic from inelastic scattering. The elastic asymmetries exhibit clear evidence of a deep minimum at 27 degrees followed by a strong maximum at 35 degrees, in qualitative agreement with various predictions from $L·S$ coupling in an optical model of the scattering. Possible reasons are given for the failure of the minimum to appear in the results of other experimenters.