Measurements of the differential cross section for pion charge exchange on ${}_{}{}^3{}_{}{}^{}\mathrm{H}$ have been carried out at incident pion momenta of 232 and 252 MeV/c. The results are compared with several theoretical predictions and also with charge-independence bounds determined from elastic-scattering cross sections obtained in the same experiment.

• Received 10 September 1979

DOI:https://doi.org/10.1103/PhysRevLett.44.234