π+−pInteractions at 500 Mev

Abstract

The interaction of ${\ensuremath{\pi}}^{+}$ mesons with protons at an energy of 500 Mev has been studied in a hydrogen bubble chamber. Phase-shift analyses with $S$ and $P$ waves were made, and a near degeneracy was found between the Fermi and Yang solutions. When $D$ waves were included, an additional ambiguity was found. The $D$-wave phase shifts are small, but they have a considerable effect on the other phase shifts. The cross section for single pion production is 2.85\ifmmode\pm\else\textpm\fi{}0.5 mb. The ratio $\frac{(p+0)}{(n++)}$ is ${1.5}_{\ensuremath{-}0.5}^{+1.5}$. The cross section leading to $p++\ensuremath{-}$ was found to be of the order of 30 \ensuremath{\mu}b.