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We consider three-body recombination into deep dimers in a mass-imbalancedtwo-component atomic gas. We use an optical model where a phenomenologicalimaginary potential is added to the lowest adiabatic hyper-spherical potential.The consequent imaginary part of the energy eigenvalue corresponds to the decayrate or recombination probability of the three-body system. The method isformulated in details and the relevant qualitative features are discussed asfunctions of scattering lengths and masses. We use zero-range model in analysesof recent recombination data. The dominating scattering length is usuallyrelated to the non-equal two-body systems. We account for temperature smearingwhich tends to wipe out the higher-lying Efimov peaks. The range and thestrength of the imaginary potential determine positions and shapes of theEfimov peaks as well as the absolute value of the recombination rate. TheEfimov scaling between recombination peaks is calculated and shown to depend onboth scattering lengths. Recombination is predicted to be largest forheavy-heavy-light systems. Universal properties of the optical parameters areindicated. We compare to available experiments and find in general verysatisfactory agreement.

Three-body recombination of two-component cold atomic gases into deep dimers in an optical model