Heavy nuclei at collider energies are a source of high energy
Weizsaecker-Williams photons. This photon flux may be utilized to study high
energy photon-nucleus interactions. Here we concentrate on the coherent
diffractive production of heavy vector mesons on nuclear targets and show how
it probes the unintegrated glue of the nucleus in the saturation domain. We
present predictions for rapidity distributions of exclusive coherent J/Psi and
Upsilon mesons which can be measured by the ALICE experiment at the LHC.Comment: 17 pages, 12 eps figure