Vector analyzing power measurement of pion scattering from polarized ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ in the region of the ${\mathrm{\Delta }}_{33}$ resonance

The inclusive vector analyzing power ${\mathit{iT}}_{11}$ of ${\mathrm{\pi }}^{+}$${\to }^7$Li elastic scattering and inelastic scattering to the 0.47 MeV excited state was measured at several angles for ${\mathit{T}}_{\mathrm{\pi }}$=134, 164, and 194 MeV. The polarization effects were found to be small but nonzero, the trend of the data is well described by a coupled channels calculation. The results of the calculation are more sensitive to variations of the nuclear structure input than to variations of the reaction mechanism.