Phys. Rev. A 73, 040702(R) (2006) [4 pages]
Feshbach spectroscopy of a K-Rb atomic mixture
Abstract
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Francesca Ferlaino, Chiara D'Errico, Giacomo Roati, Matteo Zaccanti, Massimo Inguscio, and Giovanni ModugnoLENS and Dipartimento di Fisica, Università di Firenze, and INFM-CNR, Via Nello Carrara 1, 50019 Sesto Fiorentino, ItalyAndrea SimoniLaboratoire de Physique des Atomes, Lasers, Molécules et Surfaces, UMR 6627 du CNRS and Université de Rennes, 35042 Rennes Cedex, France
Received 24 October 2005; published 14 April 2006
We perform extensive magnetic Feshbach spectroscopy of an ultracold mixture of fermionic 40K and bosonic 87Rb atoms. The magnetic-field locations of 13 interspecies resonances are used to construct a quantum collision model able to predict accurate collisional parameters for all K-Rb isotopic pairs. In particular, we determine the interspecies s-wave singlet and triplet scattering lengths for the 40K-87Rb mixture as (–108±3)a0 and (–205±5)a0, respectively. We also predict accurate scattering lengths and the position of Feshbach resonances for the other K-Rb isotopic pairs. We discuss the consequences of our results for current and future experiments with ultracold K-Rb mixtures.
©2006 The American Physical Society
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