As part of an experimental study of the πNN system, the pion-deuteron breakup reaction ${\mathrm{\pi }}^{+}$d→→pn${\mathrm{\pi }}^{+}$ was investigated at intermediate energies. Distributions of the vector analyzing power ${\mathit{iT}}_{11}$ versus outgoing proton momentum ${\mathit{P}}_{\mathit{p}}$ are presented for 36 πp angle pairs in the range of scattering angles 20°≤${\mathrm{\theta }}_{\mathit{p}}$≤51°, 62°≤${\mathrm{\theta }}_{\mathrm{\pi }}$≤124° at 228 and 134 MeV. These include 7 previously unmeasured angle pairs at 228 MeV and 20 new pairs at 134 MeV. In all regions of overlap with previous measurements, there is excellent agreement. There is generally excellent agreement with relativistic Faddeev predictions, except in the np final-state interaction region at 228 MeV. This is in contrast to the cross-section measurements, which are not well described by the theory.

• Received 11 July 1995

DOI:https://doi.org/10.1103/PhysRevC.52.2526