Polarization observables in π+6Li scattering: Analyzing powers iT11 and τ22

The vector analyzing power iT11 and the tensor analyzing power τ22=T22+T20/ √6 have been measured for π+→6L rvec i 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 iT11 depends strongly on the transverse form factor whichever nuclear wave function is chosen. In the angular region where the iT11 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