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We discuss three-body recombination of ultra-cold atoms to a weakly bound $s$level. In this case, characterized by large and positive scattering length $a$for pair interaction, we find a repulsive effective potential for three-bodycollisions, which strongly reduces the recombination probability and makessimple Jastrow-like approaches absolutely inadequate. In the zero temperaturelimit we obtain a universal relation, independent of the detailed shape of theinteraction potential, for the (event) rate constant of three-bodyrecombination: $\alpha_{\rm rec}=3.9\hbar a^4/m$, where $m$ is the atom mass.Comment: 10 pages, 3 Postscript figure

physical review letters

Three-Body Recombination of Ultracold Atoms to a Weakly Bound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">s</mml:mi></mml:math>Level

Three-Body Recombination of Ultracold Atoms to a Weakly BoundsLevel