Abstract
We report on measurements of three-body recombination loss rates in an ultracold gas of 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 and the effective range . 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.
- Received 14 April 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.053202
© 2014 American Physical Society