Efimov physics in a mixture of $^{40}$K and $^{87}$Rb*

Three-body Efimov resonances have now been detected in a number of ultracold atom species using measurements of three-body recombination rates. Moreover, recent observations suggest that the locations of these resonances has some universality, in that they can be predicted using the two-body van der Waals length [1]. To compare with a recent prediction for the $^{40}$K + $^{87}$Rb system [2] and with a previous experimental result for $^{41}$K + $^{87}$Rb [3], we measure three-body recombination and molecule loss rates in an ultracold trapped gas of $^{40}$K and $^{87}$Rb atoms near an interspecies Feshbach resonance. \\[4pt] [1] PRL 107, 120401 (2011)\\[0pt] [2] arXiv:1111.1484v1\\[0pt] [3] PRL 103, 043201 (2009)