Spin effects in pi -nucleus scattering in the region of the Delta (3,3) resonance.

We present the first measurements of spin effects in {pi}{sup +} elastic and inelastic scattering from complex nuclei, {sup 15}{rvec N}({1/2}{sup {minus}}) and {sup 6}L{rvec i}(1{sup +}). For the case of {sup 15}{rvec N}, the analyzing power {ital A}{sub {ital y}} was measured at {ital T}{sub {pi}}=164 MeV between 60{degree} and 100{degree}. Although large values of {ital A}{sub {ital y}} are predicted by theory, the data are consistent with zero. For the case of {sup 6}L{rvec i}, the analyzing power {ital iT}{sub 11} was measured at {ital T}{sub {pi}}=134 and 164 MeV, between 50{degree} and 110{degree}. Large values of {ital iT}{sub 11} were found at some angles, but the measured angular distributions differ considerably from theoretical predictions.