We determine the interspecies s-wave triplet scattering length a3 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 a3=+163+57−12a0 ensures the stability against collapse 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.
Collisional properties of ultracold K-Rb mixtures / G. FERRARI; M. INGUSCIO; W. JASTRZEBSKI; G. MODUGNO; G. ROATI; A. SIMONI. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 89:(2002), pp. 053202-053202.
Collisional properties of ultracold K-Rb mixtures
INGUSCIO, MASSIMO;MODUGNO, GIOVANNI;
2002
Abstract
We determine the interspecies s-wave triplet scattering length a3 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 a3=+163+57−12a0 ensures the stability against collapse 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.
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