Decay of an ultracold fermionic lithium gas near a Feshbach resonance

Details Decay of an ultracold fermionic lithium gas near a Feshbach resonance Decay of an ultracold fermionic lithium gas near a Feshbach resonance

2002-07-02

arxiv.org/abs/cond-mat/0207046v3

Phys. Rev. Lett. 89, 203201 (2002)

Physics

Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.89.203201

We studied the magnetic field dependence of the inelastic decay of an ultracold, optically trapped 6-Li gas of different spin compositions. The spin mixture of the two lowest hyperfine states showed two decay resonances at 550 G and 680 G due to two-body collisions, close to the predicted Feshbach resonance of the elastic s-wave collisions at 800 G. The rapid decay near Feshbach resonances found in bosonic gases was found to be suppressed by the Pauli exclusion principle. The observed lifetimes of several hundred milliseconds are much longer than the expected time for Cooper pair formation and the phase transition to superfluidity in the vicinity of the Feshbach resonance.

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