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Reactive or elastic two-body collisions in an ultracold gas are affected byquantum statistics. In this paper, we study ensemble-averaged collision ratesfor a two-species fermionic gas. The two species may have different masses,densities and temperatures. We investigate how averaged collision rates areaffected by the presence of Fermi spheres in the initial states; Pauli blockingof final states is not considered. It is shown that, independently on thedetails of the collision, Fermi-averaged collision rates deviate fromBoltzmann-averaged ones, particularly for a gas with strong imbalance of massesor densities.

Averaged collision and reaction rates in a two-species gas of ultracold fermions