POLARIZATION OBSERVABLES IN PI-6 SCATTERING - ANALYZING POWERS IT(11)AND TAU-22( LI)

The vector analyzing power iT11 and the tensor analyzing power tau22 = T22 + T20/square-root 6 have been measured for pi+ --> Li-6 elastic a nd 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 fr om our group are compared with new coupled channels calculations. With in the coupled channels model, the influence of different nuclear wave functions, the strength of the coupling of the ground and first excit ed states, and the effects of the phenomenological second-order potent ial were investigated. It was found that the calculated vector analyzi ng 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 agreeme nt with the data can be obtained for a large energy and angular region with the first-order potential only.