Polarization ofHe3Scattered fromC12

The polarization of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ particles elastically scattered from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ has been measured over an angular range $25°<~{\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}<~74°$ at 18 MeV and $31°<~{\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}<~61°$ at 20 MeV. Double-scattering techniques were used to determine the polarizations. A spin-orbit well depth of greater than 3 MeV is required in order to obtain reasonable agreement between optical-model predictions and the polarization data.