As a contribution to the study of high-multiplicity phenomena, we have analyzed 3502 six-chargedprong ir + p interactions observed in a hydrogen bubble chamber; the incident x + momentum was 5 GeV/c. The total cross section for this multiplicity is a = 1.33±0.05 mb, mostly contributed by the following reactions : (A) TT + P -> P3TT + 2TT-(0.40±0.03 mb), (B) n+p -> pZir+lir-^ (0.61±0.04mb), and (C) -rr+p -»n^liT (0.11 ±0.02 mb). Individual particle momentum distributions, when compared with Lorentz-invariant statistical phase space, display deviations which are rather weak but still quite significant. The p° meson is abundantly produced in the first reaction (0.26±0.05 mb). In the second reaction the co meson is seen with a comparable cross section (0.26±0.03 mb); %° and t\ are also observed (50±20 fxb and 100±20 /*b, respectively, after correction for neutral decays). For both p° and w resonances there is indication of spin alignment. A r * ++ (1236) production is quite strong; the rate estimate is made difficult by the presence of distortions of the mass spectrum that are shown to be mostly concerned with the ir + p combinations of low cm. velocity. It is suggested that the short lifetime of the iV*(1236) resonance has some bearing on this effect, which indeed seems to affect also the p° and not the longer-lived o*.
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