Collisional properties of ultracold K-Rb mixtures

We determine the interspecies s-wave triplet scattering length a(3) for all K-Rb isotopic mixtures by measuring the elastic cross section for collisions between 41K and 87Rb in different temperature regimes. The positive value a(3)=+163(+57)(-12)a(0) ensures the stability against collapse of binary...

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Bibliographic Details
Published in:Physical review letters 2002-07, Vol.89 (5), p.053202-053202, Article 053202
Main Authors: Ferrari, G, Inguscio, M, Jastrzebski, W, Modugno, G, Roati, G, Simoni, A
Format: Article
Language:English
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Summary:We determine the interspecies s-wave triplet scattering length a(3) for all K-Rb isotopic mixtures by measuring the elastic cross section for collisions between 41K and 87Rb in different temperature regimes. The positive value a(3)=+163(+57)(-12)a(0) ensures the stability against collapse of binary (41)K- (87)Rb Bose-Einstein condensates. For the fermion-boson mixture (40)K- (87)Rb, we obtain a large and negative scattering length which implies an efficient sympathetic cooling of the fermionic species down to the degenerate regime.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.89.053202