Pion-Electron Scattering Cross Section at 1.12 Bev/c

We have measured the absolute differential cross section $\frac{d\sigma }{\mathrm{dK}}$ for production of delta-ray electrons by 1.12-Bev/c negative pions incident on a 10-in. liquid hydrogen bubble chamber, for values of the $\delta$-ray kinetic energy $K$ between 32 Mev and the kinematical upper limit of 62 Mev. The results are in agreement with the theoretical prediction of Bhabha. We find an integrated cross section $\sigma (K>\mathrm{}32\mathrm{} \mathrm{Mev})=1.37\mathrm{}\pm 0.17 \mathrm{mb}.$ This exceeds the theoretical prediction of 1.17 mb by a factor 1.17±0.15.