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26 April 2024

» arxiv » 1303.3843

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Universality of the three-body Efimov parameter at narrow Feshbach resonances
Sanjukta Roy ; Manuele Landini ; Andreas Trenkwalder ; Giulia Semeghini ; Giacomo Spagnolli ; Andrea Simoni ; Marco Fattori ; Massimo Inguscio ; Giovanni Modugno ;
Date:	15 Mar 2013
Abstract:	We measure the critical scattering length for the appearance of the first three-body bound state, or Efimov three-body parameter, at seven different Feshbach resonances in ultracold 39K atoms. We study both intermediate and narrow resonances, where the three-body spectrum is expected to be determined by the non-universal coupling of two scattering channels. We observe instead approximately the same universal relation of the three-body parameter with the two-body van der Waals radius already found for broader resonances, which can be modeled with a single channel. This unexpected observation suggests the presence of a new regime for three-body scattering at narrow resonances.
Source:	arXiv, 1303.3843
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