title: Near Threshold Effects on Recombination and Vibrational Relaxation in Efimov Systems.
abstract: We investigate the energy dependence of inelastic processes in systems which possess Efimov states. We consider the three-body recombination rate K3where three free atoms interact to produce an atom-dimer pair, and the relaxation rate Krelwhere an atom quenches a weakly bound state of a dimer near an Efimov resonance to more deeply bound levels. Using a model capturing the key features of the Efimov problem, we identify new energy regimes for K3, namely the near threshold resonance (NTR) regime behavior E-2for negative scattering lengths and the near threshold suppression (NTS) regime behavior E2for positive scattering lengths. We also confirm a previously found oscillatory behavior of K3at higher energy E. Finally, we find that Krelbehaves as E-1in the NTR regime.
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT, 06268, USA.
authors.forename: Di
authors.initials: D
authors.lastname: Shu
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT, 06268, USA.
authors.forename: Ionel
authors.initials: I
authors.lastname: Simbotin
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT, 06268, USA.
authors.forename: Robin
authors.initials: R
authors.lastname: Côté
keywords: Efimov physics; cold molecules; three-body recombination; threshold resonances; vibrational relaxation