Lifetime of the Bose Gas with Resonant Interactions

Author(s): B. S. Rem, A. Grier, I. Ferrier-Barbut, U. Eismann, Tim Langen, N. Navon, L. Khaykovich, F. Werner, D. S. Petrov, F. Chevy, C. Salomon

Journal: Physical Review Letters

Volume: 110

Page(s): 163202

Year: 2013

DOI Number: 10.1103/PhysRevLett.110.163202

Link: Link to publication


We study the lifetime of a Bose gas at and around unitarity using a Feshbach resonance in lithium 7. At unitarity, we measure the temperature dependence of the three-body decay coefficient L3. Our data follow a L3=λ3/T2 law with λ3=2.5(3)stat(6)syst×10-20 (μK)2 cm6 s-1 and are in good agreement with our analytical result based on zero-range theory. Varying the scattering length a at fixed temperature, we investigate the crossover between the finite-temperature unitary region and the previously studied regime where |a| is smaller than the thermal wavelength. We find that L3 is continuous across the resonance, and over the whole a<0 range our data quantitatively agree with our calculation.


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