Finite-range corrections near a Feshbach resonance and their role in the Efimov effect
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We have measured the binding energy of 7Li Feshbach molecules deep into the nonuniversal regime by associating atoms in a Bose-Einstein condensate with a modulated magnetic field. We extract the scattering length from these measurements, correcting for nonuniversal short-range effects using the field-dependent effective range. With this more precise determination of the Feshbach resonance parameters we reanalyze our previous data on the location of atom loss features produced by the Efimov effect [Pollack et al., Science 326, 1683 (2009)]. We find the measured locations of the three- and four-body Efimov features to be consistent with universal theory at the 20%-30% level.
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Dyke, P., Pollack, S.E. and Hulet, R.G.. "Finite-range corrections near a Feshbach resonance and their role in the Efimov effect." Physical Review A, 88, no. 2 (2013) American Physical Society: 23625. http://dx.doi.org/10.1103/PhysRevA.88.023625.