<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mi>J</mml:mi></mml:mrow><mml:mrow><mml:mi>ψ</mml:mi></mml:mrow></mml:mfrac></mml:math>Photoproduction from 60 to 300 GeV/<i>c</i>

Measurements of the energy and $t$ dependence of diffractive $\frac{J}{\ensuremath{\psi}}$ photoproduction are presented. A significant rise in the cross section over the energy range 60-300 GeV is observed. It is found that (30\ifmmode\pm\else\textpm\fi{}4)% of the events are inelastic.