title: Three-body recombination at large scattering lengths in an ultracold atomic gas.
abstract: We study three-body recombination in an optically trapped ultracold gas of cesium atoms with precise magnetic control of the s-wave scattering length a. At large positive values of a, we measure the dependence of the rate coefficient on a and confirm the theoretically predicted scaling proportional to a(4). Evidence of recombination heating indicates the formation of very weakly bound molecules in the last bound energy level.
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
authors.forename: Tino
authors.initials: T
authors.lastname: Weber
authors.forename: Jens
authors.initials: J
authors.lastname: Herbig
authors.forename: Michael
authors.initials: M
authors.lastname: Mark
authors.forename: Hanns-Christoph
authors.initials: HC
authors.lastname: Nägerl
authors.forename: Rudolf
authors.initials: R
authors.lastname: Grimm