  Antiproton ($\bar{p}$) yields are presented for proton-nucleus collisions,
with targets Be, Cu, and Au, at beam momenta of 12.3 and 17.5 GeV/c. In
addition to target size and beam momentum, the number of projectile collisions
$\nu$, as derived from the number of ``grey'' tracks (slow protons and
deuterons), is used to disentangle the $\bar{p}$ reabsorption from the
production. By quantifying the amount of reabsorption of the $\bar{p}$ within
the nucleus as a function of $\nu$, the annihilation within the nucleus is
estimated and compared to the free annihilation cross section. Preliminary
results on antilambda ($\bar{\Lambda}$) production as a function of $\nu$ are
also presented for comparison.
