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arXiv · 1212.5274

Lifetime of the Bose Gas with Resonant Interactions

B. S. Rem·A. T. Grier·I. Ferrier-Barbut·U. Eismann·T. Langen·N. Navon·L. Khaykovich·F. Werner·D. S. Petrov·F. Chevy·C. Salomon
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Abstract

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 $L_{3}$. Our data follow a $L_3 {=} λ_{3} / T^{2}$ law with $λ_{3} = 2.5(3)_{stat}_(6)_{sys} 10^{-20} (μK)^2 cm^6 s^{-1}$ and are in good agreement with our analytical result based on the 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 $L_{3}$ is continuous across resonance, and over the whole $a {<} 0$ range our data quantitatively agree with our calculation.

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B. S. Rem, A. T. Grier, I. Ferrier-Barbut, U. Eismann, T. Langen, N. Navon, L. Khaykovich, F. Werner, D. S. Petrov, F. Chevy, C. Salomon. 2013-05-13. Lifetime of the Bose Gas with Resonant Interactions. https://doi.org/10.1103/physrevlett.110.163202

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