  The double dissociation photoproduction cross section for the process gamma p
-> XY, in which the systems X and Y are separated by a large rapidity gap, is
measured at large 4-momentum transfer squared |t| > 20 GeV^2 by the H1
Collaboration at HERA. This measurement provides for the first time a direct
measurement of the energy dependence of the gap production process at high |t|.
