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We have investigated the ultracold interspecies scattering properties ofmetastable triplet He and Rb. We performed state-of-the-art ab initiocalculations of the relevant interaction potential, and measured theinterspecies elastic cross section for an ultracold mixture of metastabletriplet $^4$He and $^{87}$Rb in a quadrupole magnetic trap at a temperature of0.5 mK. Our combined theoretical and experimental study gives an interspeciesscattering length $a_{4+87}=+17^{+1}_{-4}$ $a_0$, which prior to this work wasunknown. More general, our work shows the possibility of obtaining accuratescattering lengths using ab initio calculations for a system containing aheavy, many-electron atom, such as Rb.

Ultracold mixtures of metastable He and Rb: scattering lengths from ab initio calculations and thermalization measurements