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NUMBER 6 DECEMBER , 1961 SUPPRESSION OF TWO-MESON ANNIHILATION IN ANTIPROTON-PROTON INTERACTION

ONE of the most interesting experimental facts is the suppression of the two-meson annihilation in the antiproton-proton interaction. Among 3000 annihilation stars in a propane bubble chamber (antiproton momentum ~ 1 Bev I c ) Goldhaber et al. (cited in Sakurai 1 ) did not observe a single two-meson annihilation event (see Sakurai, 1 p. 29 ). In the studies of annihilation of antiprotons with momentum up to 1.15 Bev I c in a hydrogen bubble chamber2 altogether only two events were found, that the authors could interpret as the reaction