Measurement of the vector analyzing power iT 11 in π + − 6 Li→ scattering

The vector analyzing power ${\mathit{iT}}_{11}$ was measured for ${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{-}}}^{6}$L\ensuremath{\rightarrow}i elastic and inelastic scattering (${3}^{+}$, 2.19 MeV) at 100, 134, 164, and 219 MeV, in an angular range between 40\ifmmode^\circ\else\textdegree\fi{} and 125\ifmmode^\circ\else\textdegree\fi{} using a vector polarized $^{6}\mathrm{LiD}$ target. Sizable spin effects were observed over most of the angular range. The data were compared with a number of theoretical predictions based on different scattering models and nuclear structure input. None of the calculations is able to reproduce the data set; however, it appears that the vector analyzing power ${\mathit{iT}}_{11}$ is mostly sensitive to the nuclear wave function chosen. The angular distribution of ${\mathit{iT}}_{11}$ in ${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{-}}}^{6}$Li elastic and inelastic scattering is discussed in terms of nuclear form factors and elementary \ensuremath{\pi}N amplitudes.