Collisional relaxation of Feshbach molecules and three-body recombination in 87Rb Bose-Einstein condensates

Abstract

We predict the resonance enhanced magnetic field dependence of atom-dimer relaxation and three-body recombination rates in a ${}^{87}$Rb Bose-Einstein condensate (BEC) close to 1007 G. Our exact treatments of three-particle scattering explicitly include the dependence of the interactions on the atomic Zeeman levels. The Feshbach resonance distorts the entire diatomic energy spectrum causing interferences in both loss phenomena. Our two independent experiments confirm the predicted recombination loss over a range of rate constants that spans four orders of magnitude.

4 pages, 3 eps figures (updated references)

References in corpus (8)

• Feshbach resonances in rubidium 87: Precision measurement and analysis
• Observation of molecules produced from a Bose-Einstein condensate
• Three-boson problem near a narrow Feshbach resonance
• Adiabatic association of ultracold molecules via magnetic field tunable interactions
• Characterization of elastic scattering near a Feshbach resonance in rubidium 87
• Dissociation of ultracold molecules with Feshbach resonances
• Production of three-body Efimov molecules in an optical lattice
• Collisional decay of 87Rb Feshbach molecules at 1005.8 G

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• Excited Thomas-Efimov levels in ultracold gases
• Spectroscopy of the a^3Σ_u^+ state and the coupling to the X^1Σ_g^+ state of K_2
• Formation of deeply bound molecules via chainwise adiabatic passage