Antiproton annihilation at rest in nitrogen and deuterium gas.

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Results on antiproton absorption at rest in gaseous nitrogen and deuterium are presented from an analysis of approximately ${10}^{6}$ events each taken with a magnetic spectrometer. Inclusive features such as pion and proton multiplicities and spectra are presented. Data relating to absorption modes requiring more than one nucleon, such as the \ensuremath{\Lambda} yield, the \ensuremath{\Lambda} spectrum, and the exclusive deuterium channels p\ifmmode\bar\else\textasciimacron\fi{}d\ensuremath{\rightarrow}${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$p, \ensuremath{\Lambda}${K}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ are discussed. The fully reconstructable channels p\ifmmode\bar\else\textasciimacron\fi{}d\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$p,${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{+}$ ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$p also show a high-energy proton tail unaccounted for by single nucleon rescattering mechanisms.