Sympathetic cooling of two atomic isotopes is experimentally investigated. Using forced evaporation of a bosonic ⁷Li gas in a magnetic trap, a sample of 1.3×10⁵ ⁶Li fermions has been sympathetically cooled to 9(3) μK, corresponding to $2.2(0.8)$ times the Fermi temperature. The measured rate constant for two-body inelastic collisions of the ⁷Li $|2,2〉$ state at low magnetic field is 1.0_-0.5+0.8×10^-14 cm³s^-1.
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Schreck et al. (2001) studied this question.
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