Observation of a zero-energy resonance in Cs-Cs collisions

Author(s): M. Arndt, M. B. Dahan, D. G. Odelin, M. Reynolds, J. Dalibard

Journal: Physical Review Letters

Volume: 79

Page(s): 625-628

Year: 1997

DOI Number: 10.1103/PhysRevLett.79.625


We measure the cross section for s-wave collisions of Cs atoms in a magnetic trap. From the relaxation of the atomic cloud towards thermal equilibrium, we infer that the cross section varies as 1/T over the temperature range T = 5-60 mu K. It takes at each measured temperature the maximum allowed value for polarized bosons. This indicates a zero-energy resonance generated by a bound or virtual state less than 5 mu K from the dissociation threshold.

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