# Sympathetic cooling and collisional properties of a Rb-Cs mixture

Anderlini, M. and Courtade, E. and Cristiani, M. and Cossart, D. and Ciampini, D. and Sias, C. and Morsch, O. and Arimondo, E. (2004) Sympathetic cooling and collisional properties of a Rb-Cs mixture. Physical review. A, Atomic, Molecular, and Optical Physics . ISSN 1094-1622

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## Abstract

We report on measurements of the collisional properties of a mixture of $^{133}$Cs and $^{87}$Rb atoms in a magnetic trap at $\mu\mathrm{K}$ temperatures. By selectively evaporating the Rb atoms using a radio-frequency field, we achieved sympathetic cooling of Cs down to a few $\mu\mathrm{K}$. The inter-species collisional cross-section was determined through rethermalization measurements, leading to an estimate of $a_s=595 a_0$ for the s-wave scattering length for Rb in the $|F=2, m_F=2>$ and Cs in the $|F=4, m_F=4>$ magnetic states. We briefly speculate on the prospects for reaching Bose-Einstein condensation of Cs inside a magnetic trap through sympathetic cooling.

Item Type: Article Imported from arXiv Area02 - Scienze fisiche > FIS/03 - Fisica della materia Dipartimenti (until 2012) > DIPARTIMENTO DI FISICA " E. FERMI" dott.ssa Sandra Faita 08 Apr 2015 11:18 08 Apr 2015 11:18 http://eprints.adm.unipi.it/id/eprint/1391

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