  The strong electromagnetic fields surrounding the Pb-ions accelerated at the
CERN Large Hadron Collider (LHC) allow two-photon and photonuclear interactions
to be studied in a so far unexplored kinematic regime. Exclusive
photoproduction of vector mesons can be studied in ultra-peripheral collisions,
where the impact parameters are larger than the sum of the nuclear radii and
hadronic interactions are strongly suppressed.
  During the heavy-ion runs at the LHC in 2010 and 2011, the ALICE
collaboration used special triggers to select ultra-peripheral collisions.
These triggers were based on the Muon spectrometer, the Time-of-Flight
detector, the Silicon Pixel detector, and the VZERO scintillator array.
Information from other detectors was also used in the analysis. The cross
section for coherent photoproduction of J/Psi mesons at forward rapidities will
be presented. The result will be compared to model calculations and its
implications for nuclear gluon shadowing will be discussed.
