Abstract
We measure the cross section for -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 over the temperature range . 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 from the dissociation threshold.
- Received 28 January 1997
DOI:https://doi.org/10.1103/PhysRevLett.79.625
©1997 American Physical Society