π+-Proton Scattering at 990 Mev

Positive-pion scattering at 990±30 Mev has been examined in a 6×3×2 in. hydrogen bubble chamber without a magnetic field. The cross sections for elastic and inelastic scattering were found to be 15.3±1.5 mb and 12.6±3.3 mb, respectively. The inelastic scattering cross section includes ${0.19}_{-0.07\mathrm{}}^{+0.09\mathrm{}}$ mb of ${\Sigma }^{+}-K^{+}$ production and 0.78±0.14 mb of ${\pi }^{+}{\pi }^{+}{\pi }^{-}p$ production. A simple pion-pion model which predicts the branching ratios for double pion production in ${\pi }^{-}-p$ collisions is found to be inconsistent with the double pion production observed in this experiment. The relation of the experiment to ${\pi }^{-}-p$ experiments in the region of the second and third resonances is discussed.