JET PRODUCTION WITH RAPIDITY GAPS AT DO

Preliminary results from the D0 experiment on jet production with rapi dity gaps in <p(p)over bar> collisions are presented. A class of dijet events with a forward rapidity gap is observed at center-of-mass ener gies root s = 1800 GeV and 630 GeV. The number of events with rapidity gaps at both center-of-mass energies is significantly greater than th e expectation from multiplicity fluctuations and is consistent with a hard single diffractive process. A class of events with two forward ga ps and central dijets is also observed at 1800 GeV. This topology is c onsistent with hard double pomeron exchange. We also present results o n the observation of a class of events with low particle multiplicity between jets, attributable to the exchange of a strongly-interacting c olor-singlet.