  We report on the production of J/psi mesons in 530 and 800 GeV/c proton - Be
collisions in the Feynman-x range 0.0 < xf < 0.6. The J/psi mesons were
detected via decays into opposite sign muon pairs. Differential distributions
for J/psi production have been measured as functions of xf, pT^2, and cosine of
the Gottfried-Jackson decay angle. These distributions are compared with
results on J/psi production obtained in 515 GeV/c pion - Be collisions,
measured by the same experiment, as well as with results from other experiments
using incident protons.
