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Ultra-peripheral collisions (UPC) occur when the interacting nuclei orprotons have an impact parameter larger than the sum of their radii. They aremediated by virtual photon exchange. The photoproduction of heavy vector mesonsis especially interesting because they couple to the photon. The ALICECollaboration has analysed both p-Pb and Pb-Pb UPC at the centre-of-mass energyof $\sqrt{s_{\rm NN}} = 5.02$TeV which correspond to $\gamma$p and $\gamma$-Pbinteractions, respectively. This poster reports the exclusive photoproductionof ${\mathrm J}/\psi$ off proton and Pb targets, which shed light on theoccurrence of saturation and nuclear shadowing, respectively. In more detail,the p-Pb results measure the growth of the cross section for exclusiveproduction over a wide range in Bjorken-$x$ from ~$10^{-2}$ to ~$10^{-5}$,while Pb-Pb results demonstrate the presence of nuclear shadowing at highenergies and low scales of the order of the mass of the ${\mathrm J}/\psi$.

UPC: a powerful tool for ${\mathrm J}/\psi$ photoproduction analysis in ALICE