Results of the first pion single-charge-exchange experiment on a polarized nuclear target are reported. Analyzing powers ${\mathit{A}}_{\mathit{y}}$ for the (${\mathrm{\pi }}^{+}$,${\mathrm{\pi }}^0$) reaction at ${\mathit{T}}_{\mathrm{\pi }}^{+}$=163 MeV on a polarized ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ target were measured over an angular range between 20° and 60° in the laboratory system. Calculations in the distorted-wave impulse approximation do not reproduce these new data.

• Received 13 September 1990

DOI:https://doi.org/10.1103/PhysRevLett.66.2193