Universal three-body parameter in ultracold 4He*

S. Knoop, J. Borbely, W. Vassen, S.J.J.M.F. Kokkelmans

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We have analyzed our recently measured three-body loss rate coefficient for a Bose-Einstein condensate of spin-polarized metastable triplet 4He atoms in terms of Efimov physics. The large value of the scattering length for these atoms, which provides access to the Efimov regime, arises from a nearby potential resonance. We find the loss coefficient to be consistent with the three-body parameter (3BP) found in alkali-metal experiments, where Feshbach resonances are used to tune the interaction. This provides evidence for a universal 3BP outside the group of alkali-metal elements. In addition, we give examples of other atomic systems without Feshbach resonances but with a large scattering length that would be interesting to analyze once precise measurements of three-body loss are available. © 2012 American Physical Society.
Original languageEnglish
Article number062705
Pages (from-to)062705
JournalPhysical Review A. Atomic, Molecular and Optical Physics
Issue number6
Publication statusPublished - 2012


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