  At the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National
Laboratory and at the Large Hadron Collider (LHC) at CERN, particles will be
produced in coherent and diffractive nuclear interactions. In extremely
peripheral nuclear collisions (b$>$2R), coherent interactions occur at very
high rates and are dominated by photon-Pomeron or photon-meson processes. In
these reactions, the photon and the Pomeron/meson from the electromagnetic and
nuclear fields couple coherently to all nucleons. The rates for photonuclear
interactions are roughly two orders of magnitude larger than for two-photon
interactions at comparable center-of-mass energies.
