Scattering of 31.5-Mev Positive Pions from Carbon

Measurements were made at laboratory angles from 40^∘{} to 145^∘{} on the scattering of 31.5-Mev positive pions from carbon. Pulse-height analysis was used to select elastic scattering events. The observed differential cross sections for elastic scattering indicate destructive interference between the Coulomb and nuclear scattering amplitudes. The presence of inelastic pion scattering is inferred from a combination of different methods of study: pulse-height analyses, absorption measurements, and detailed comparisons of the data obtained in the case of carbon with those obtained in the case of copper and lead. An upper limit of 2 is placed on the spin of the 9.6-Mev state of C¹². This is not in disagreement with the results of other experiments and existing theoretical predictions.