  The first LHC measurement on ultra-peripheral heavy-ion collisions was
carried out with the ALICE experiment. In this paper, ALICE results on
exclusive J/psi studies in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV, in the
rapidity region -3.6 < y < -2.6, are given. The coherent J/psi cross section
was found to be dsigma/dy_coh_J/\psi = 1.00 +/- 0.18 (stat) +0.24 -0.26 (syst)
mb. These studies favour theoretical models that include strong modifications
to the nuclear gluon density, also known as nuclear gluon shadowing.
