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The properties of the final-state hadronic system in antineutrino-proton charged-current interactions a r e presented. The events were observed in the Fermilab 15-foot hydrogen bubble chamber. The average energy of the events i s -30 GeV, but there a r e some interactions beyond 100 GeV. The mean multiplicity of the charged hadrons varies a s ( n : ) = (0.06*0.06)+ ( 1 . 2 2 i 0 . 0 3 ) l n~~ for hadronic masses W in the range l . 0 < 7V2< 50 &v2. By contrast, the multiplicity depends only weakly on the four-momentum transfer between the leptons. The mean pion multiplicities for events with three o r more charged tracks a r e found to be (n-) =1.64*0.04, (no) =1.16+0.13, for s' and no production, respectively. By comparing the number of positive tracks with T' data from neutrino production, we deduce a mean proton multiplicity (n,,) of 0.5310.15. The single-particle distributions in both longitudinal and transverse momentum a r e found to be similar to those for nondiffractive production in hadronic collisions. The fragmentation properties of the final-state d quarks a r e compared to the expectations of the quark-parton model. The fraction of observed neutral-strange-particle production for events with three o r more charged tracks i s 0.08 i 0 . 0 1 5 and i s consistent with coming completely from associated production.

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