The vector analyzing power ${\mathit{iT}}_{11}$ and the tensor analyzing power ${\mathrm{\tau }}_{22}$=${\mathit{T}}_{22}$+${\mathit{T}}_{20}$/ √6 have been measured for ${\mathrm{\pi }}^{+}$${\to }^6$Li→ elastic and inelastic scattering (to the $3^{+}$0, 2.19 MeV state) at incident pion energies of 120, 150, 180, and 194 MeV. These data and earlier ones from our group are compared with new coupled channels calculations. Within the coupled channels model, the influence of different nuclear wave functions, the strength of the coupling of the ground and first excited states, and the effects of the phenomenological second-order potential were investigated. It was found that the calculated vector analyzing power ${\mathit{iT}}_{11}$ depends strongly on the transverse form factor whichever nuclear wave function is chosen. In the angular region where the ${\mathit{iT}}_{11}$ data were taken the coupling of the ground to the first excited state has a minor effect on the theoretical predictions. Reasonable agreement with the data can be obtained for a large energy and angular region with the first-order potential only.

• Received 21 October 1993

DOI:https://doi.org/10.1103/PhysRevC.49.3117