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We explore the initial moments of impact between two dense granular clustersin a two-dimensional geometry. The particles are composed of solid CO$_{2}$ andare levitated on a hot surface. Upon collision, the propagation of a dynamic"jamming front" produces a distinct regime for energy dissipation in a granulargas in which the translational kinetic energy decreases by over 90%.Experiments and associated simulations show that the initial loss of kineticenergy obeys a power law in time, $\Delta E=-Kt^{3/2}$, a form that can bepredicted from kinetic arguments.

Energy Loss at Propagating Jamming Fronts in Granular Gas Clusters