From a 98000-photograph exposure of the BNL 80-in. deuterium-filled chamber to a 14.6-GeV/c $\overline{p}$ beam we have extracted those events that fit the channel $\overline{p}n\to \overline{p}p{\pi }^{-}$. The cross section for this channel is measured to be 730 ± 50 μb. The cross section for the reaction $\overline{p}n\to {\overline{\Delta }}^{--}\mathrm{}\left(1238\right)p$ is determined to be 130 ± 30 μb. Evidence for target dissociation is presented. A comparison with the reaction ${\pi }^{-}n\to {\pi }^{-}p{\pi }^{-}$ at the same energy indicates agreement with factorization.

• Received 27 March 1974

DOI:https://doi.org/10.1103/PhysRevD.10.1373