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arXiv · 1210.3230

Universal three-body parameter in ultracold 4He*

S. Knoop·J. S. Borbely·W. Vassen·S. J. J. M. F. Kokkelmans
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Abstract

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 new evidence for a universal 3BP, the first 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.

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S. Knoop, J. S. Borbely, W. Vassen, S. J. J. M. F. Kokkelmans. 2012-10-11. Universal three-body parameter in ultracold 4He*. https://doi.org/10.1103/physreva.86.062705

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