Abstract
$\frac{J}{\ensuremath{\psi}}$ photoproduction has been measured from beryllium and tantalum targets by observing the yield of single muons at a transverse momentum of 1.65 GeV/c with a bremsstrahlung beam of ${E}_{0}=20$ GeV. The results have been interpreted in terms of a nuclearoptics model to yield the $\ensuremath{\psi}$-nucleon total cross section. The result is ${\ensuremath{\sigma}}_{\ensuremath{\psi}N}=3.5\ifmmode\pm\else\textpm\fi{}0.8$ mb.
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