Antiproton-Proton Inelastic Interactions at 1.61 Bev/<i>c</i>and Their Use for a Test of Charge-Conjugation Invariance in Strong Interactions

Abstract

The reactions $\overline{p}+p\ensuremath{\rightarrow}\overline{p}+p+{\ensuremath{\pi}}^{0}, \overline{p}+n+{\ensuremath{\pi}}^{+}, \mathrm{and} p+\overline{n}+{\ensuremath{\pi}}^{\ensuremath{-}}$ have been investigated for antiprotons of 1.61 Bev/c. The cross sections are measured and found to be 1.6\ifmmode\pm\else\textpm\fi{}0.3 mb, 1.15\ifmmode\pm\else\textpm\fi{}0.3 mb, and 0.96\ifmmode\pm\else\textpm\fi{}0.22 mb, respectively. The combined inelastic (nonannihilation) cross section is estimated to be 5.3 mb, and the annihilation cross section 51\ifmmode\pm\else\textpm\fi{}3 mb. The angular and energy distributions are presented. In all cases the antinucleons are peaked forward and the nucleons backward in the center-of-mass system.These events can be used to check charge-conjugation invariance in strong interactions.