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We report measurements of the $\pi^- p \to \pi^o n$ differential crosssections at six momenta (104-143 MeV/c) and four angles (0-40 deg) by detectionof $\gamma$-ray pairs from $\pi^o \to \gamma \gamma$ decays using the TRIUMFRMC spectrometer. This region exhibits a vanishing zero-degree cross sectionfrom destructive interference between s-- and p--waves, thus yielding specialsensitivity to pion-nucleon dynamics and isospin symmetry breaking. Our dataand previous data do not agree, with important implications for earlier claimsof large isospin violating effects in low energy pion-nucleon interactions.

Test of isospin symmetry via low energy $^1$H($\pi^-$,$\pi^o$)$n$ charge exchange