Precision Test of the Limits to Universality in Few-Body Physics.

@article{Chapurin2019PrecisionTO,
  title={Precision Test of the Limits to Universality in Few-Body Physics.},
  author={Roman Chapurin and Xin Xie and Michel J. van de Graaff and Jared Popowski and Jos{\'e} P. D’Incao and Paul S. Julienne and Jun Ye and Eric Allin Cornell},
  journal={Physical review letters},
  year={2019},
  volume={123 23},
  pages={
          233402
        }
}
We perform precise studies of two- and three-body interactions near an intermediate-strength Feshbach resonance in ^{39}K at 33.5820(14) G. Precise measurement of dimer binding energies, spanning three orders of magnitude, enables the construction of a complete two-body coupled-channel model for determination of the scattering lengths with an unprecedented low uncertainty. Utilizing an accurate scattering length map, we measure the precise location of the Efimov ground state to test van der… 

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