Antiproton-Proton Inelastic Interactions at 1.61 Bev/cand Their Use for a Test of Charge-Conjugation Invariance in Strong Interactions

The reactions $\overline{p}+p\to \overline{p}+p+{\pi }^0, \overline{p}+n+{\pi }^{+}, \mathrm{and} p+\overline{n}+{\pi }^{-}$ have been investigated for antiprotons of 1.61 Bev/c. The cross sections are measured and found to be 1.6±0.3 mb, 1.15±0.3 mb, and 0.96±0.22 mb, respectively. The combined inelastic (nonannihilation) cross section is estimated to be 5.3 mb, and the annihilation cross section 51±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.