Collisional properties of ultracold K-Rb mixtures
arXiv:cond-mat/0202290 · doi:10.1103/PhysRevLett.89.053202
Abstract
We determine the inter-species s-wave triplet scattering length a3 for all K-Rb isotopic mixtures by measuring the cross-section for collisions between 41K and 87Rb in different temperature regimes. The positive value a3=+163(+57,-12)a0 ensures the stability of binary 41K-87Rb Bose-Einstein condensates. For the fermion-boson mixture 40K-87Rb we obtain a large and negative scattering length which implies an efficient sympathetic cooling of the fermionic species down to the degenerate regime.
4 pages, 4 figures; revised version (references added and small changes)