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 T0ex0ex=0ex0ex5--60μK. 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 5μK from the dissociation threshold.
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Arndt et al. (1997) studied this question.
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