Measurements of the analyzing power for the ${}_{}{}^{13}{}_{}{}^{}\to$(${\mathrm{\pi }}^{\pm }$,${\mathrm{\pi }}^{\pm }$) reaction at ${\mathit{T}}_{\mathrm{\pi }}$=100 MeV have been made at TRIUMF using a polarized target consisting of 99% ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ enriched butanol. Data were obtained for the ground and 3.68 MeV excited states at angles from 110° to 150° in 10° steps. The data are consistent with zero asymmetry throughout most of this angular range. Uncertainties are typically ±15%, which is sufficient to discriminate among some, but not all, of the currently available theoretical predictions.

• Received 21 August 1991

DOI:https://doi.org/10.1103/PhysRevC.45.698