title: Three-body recombination at vanishing scattering lengths in an ultracold bose gas.
abstract: We report on measurements of three-body recombination loss rates in an ultracold gas of ^{7}Li atoms in the extremely nonuniversal regime where the two-body scattering length vanishes. We show that the loss rate coefficient is well defined and can be described by two-body parameters only: the scattering length a and the effective range R_{e}. We find the rate to be energy independent, and, by connecting our results with previously reported measurements in the universal limit, we cover the behavior of the three-body recombination rate in the whole range from weak to strong two-body interactions. We identify a nontrivial magnetic field value in the nonuniversal regime where the rate should be suppressed.
authors.affiliation: Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, Netherlands.
authors.forename: Zav
authors.initials: Z
authors.lastname: Shotan
authors.affiliation: Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, Netherlands.
authors.forename: Olga
authors.initials: O
authors.lastname: Machtey
authors.affiliation: Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, Netherlands.
authors.forename: Servaas
authors.initials: S
authors.lastname: Kokkelmans
authors.affiliation: Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel.
authors.forename: Lev
authors.initials: L
authors.lastname: Khaykovich