Measurement of the vector analyzing power ${\mathit{iT}}_{11}$ in ${\mathrm{\pi }}^{+}$${\mathrm{-}}^6$Li→ scattering

The vector analyzing power ${\mathit{iT}}_{11}$ was measured for ${\mathrm{\pi }}^{+}$ ${\mathrm{-}}^6$L→i elastic and inelastic scattering ($3^{+}$, 2.19 MeV) at 100, 134, 164, and 219 MeV, in an angular range between 40° and 125° 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 ${\mathrm{\pi }}^{+}$ ${\mathrm{-}}^6$Li elastic and inelastic scattering is discussed in terms of nuclear form factors and elementary πN amplitudes.