Results on theπ−-Proton Scattering at 1 Bev and a Comparison with the Lindenbaum-Sternheimer Model

In photographs from the 10-in. hydrogen bubble chamber at Berkeley we have analyzed 640 ${\pi }^{-}$-proton scattering events with two secondary tracks. The primary ${\pi }^{-}$ energy was 1 Bev. The cross sections for the various reactions and especially for the reactions ${\pi }^{-}+p\to {\pi }^{-}+p,$ ${\pi }^{-}+p\to {\pi }^{-}+n+{\pi }^{+},$ ${\pi }^{-}+p\to {\pi }^{-}+p+{\pi }^0$ have been determined. The ratio $\frac{\sigma ({\pi }^{-}+p+{\pi }^0)}{\sigma ({\pi }^{-}+n+{\pi }^{+})}$ of the two inelastic reactions turned out to be ${0.50}_{-0.14\mathrm{}}^{+0.12\mathrm{}}$. The differential cross section of the ${\pi }^{-}$ for the elastic scattering and the momentum and angular distributions of the secondary particles from the two inelastic processes are given.