Effective range from tetramer dissociation data for cesium atoms

Abstract

The shifts in the four-body recombination peaks, due to an effective range correction to the zero-range model close to the unitary limit, are obtained and used to extract the corresponding effective range of a given atomic system. The approach is applied to an ultracold gas of cesium atoms close to broad Feshbach resonances, where deviations of experimental values from universal model predictions are associated to effective range corrections. The effective range correction is extracted, with a weighted average given by 3.9$\pm 0.8R_{vdW}$, where $R_{vdW}$ is the van der Waals length scale; which is consistent with the van der Waals potential tail for the $C{s}_2$ system. The method can be generally applied to other cold atom experimental setups to determine the contribution of the effective range to the tetramer dissociation position.

A section for two-, three- and four-boson bound state formalism is added, accepted for publication in Phys. Rev. A

References in corpus (10)

• Observation of an Efimov spectrum in an atomic system
• Three-boson problem near a narrow Feshbach resonance
• Observation of an Efimov-like resonance in ultracold atom-dimer scattering
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Cited by in corpus (1)

• Universality in Efimov associated tetramers in 4He