A complete set of analyzing powers (i${\mathrm{T}}_{11}$, ${\mathrm{T}}_{20}$, ${\mathrm{T}}_{21}$, and ${\mathrm{T}}_{22}$) are reported for the elastic scattering of 50 MeV ${}_{}{}^6{}_{}{}^{}\to$ by ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$. They are as large as or larger than those measured earlier for 30 MeV ${}_{}{}^6{}_{}{}^{}\to$. A combined optical model analysis of both energies shows ${\mathrm{T}}_{21}$ to arise from the tensor interaction, ${\mathrm{T}}_{20}$ to involve a combination of tensor and J-dependent interactions, and i${\mathrm{T}}_{11}$ to be the most complicated, arising from an explicit spin-orbit, as well as tensor and J-dependent interactions. A coordinate transformation of the data and calculations, suggested in the earlier work of Hooton and Johnson, provides the clearest evidence for the need of a tensor interaction to describe ${}_{}{}^6{}_{}{}^{}\to$ scattering. Examining the optical model calculations in terms of transferred angular momentum amplitudes provides further insight into the role played by each interaction. Also presented are the analyzing powers for the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$${(}^6$Li${,}^4$He) polarimeter reaction at this higher bombarding energy.

• Received 30 March 1995

DOI:https://doi.org/10.1103/PhysRevC.52.1924