Inelastic Collisions of a Fermi Gas in the BEC-BCS Crossover

Abstract

We report the measurement of inelastic three-body and two-body collisional decay rates for a two-component Fermi gas of ${}^6$Li, which are highly suppressed by the Pauli exclusion principle. Our measurements are made in the BEC-BCS crossover regime, near the two-body collisional (Feshbach) resonance. At high temperature (energy) the data shows a dominant three-body decay process, which is studied as a function of bias magnetic field. At low energy, the data shows a coexistence of two-body and three-body decay processes near and below the Feshbach resonance. Below resonance, the observed two-body inelastic decay can arise from molecule-atom and molecule-molecule collisions. We suggest that at and above resonance, an effective two-body decay rate arises from collisions between atoms and correlated (Cooper) pairs that can exist at sufficiently low temperature.

5 pages 4 figures

References in corpus (6)

• Theory of ultracold Fermi gases
• Weakly bound dimers of fermionic atoms
• Thermodynamic Measurements in a Strongly Interacting Fermi Gas
• Scattering Length Scaling Laws for Ultracold Three-Body Collisions
• Virial theorems for trapped cold atoms
• Efimov states near a Feshbach resonance

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