Low-Energy Three-Body Recombination Near a Feshback Resonance

摘要

Ultralow-energy three-body recombination of identical particles with internal degrees of freedom is considered. The study reveals two different mechanisms for recombination enhancement below and above resonance, namely, production of loosely bound dimers of positive scattering length a (B)→∞ and diminishing of the potential barrier in the entrance channel for negative (B)→-∞. The recombination rate on both sides of a Feshbach resonance is found to diverge as a power of the resonance detuning. The results are in agreement with experimental data.