Measurements Of Quasi-Elastic Pion Single Charge Exchange On He-3 At T-Pi=245 Mev

Differential cross sections from He-3(pi(+/-), pi(0)) and He-3(pi(+/-), pi(0)p) measurements are presented. The pi(0) energy spectra from He-3(pi(+/-), pi(0)) and He-3(pi(+), pi(0)p) are characteristic of quasi-free reactions. The proton angular distributions from He-3(pi(+), pi(0)p) also show evidence of a quasi-free mechanism. Indications of multi-nucleon processes are presented in the He-3(pi(-), pi(0)p) data. At least two nucleons must be involved. Comparisons between coincidence and single-arm measurements from this work and previous measurements of charged pion scattering on He-3 provide evidence of an enhanced multiple scattering contribution to the charge exchange channel.