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Inclusive and semi-inclusive measurements are presented for antiproton($\bar{p}$) production in proton-nucleus collisions at the AGS. The inclusiveyields per event increase strongly with increasing beam energy and decreaseslightly with increasing target mass. The $\bar{p}$ yield in 17.5 GeV/c p+Aucollisions decreases with grey track multiplicity, $N_g$, for $N_g>0$,consistent with annihilation within the target nucleus. The relationshipbetween $N_g$ and the number of scatterings of the proton in the nucleus isused to estimate the $\bar{p}$ annihilation cross section in the nuclearmedium. The resulting cross section is at least a factor of five smaller thanthe free $\bar{p}-p$ annihilation cross section when assuming a small ornegligible formation time. Only with a long formation time can the data bedescribed with the free $\bar{p}-p$ annihilation cross section.Comment: 8 pages, 6 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Antiproton production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>A</mml:mi></mml:math>collisions at 12.3 and 17.5<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">GeV</mml:mi><mml:mo>/</mml:mo><mml:mi>c</mml:mi></mml:math>

Antiproton production inp+Acollisions at 12.3 and 17.5GeV/c