Feshbach-tuned Fermionic lithium gas

The effect of the magnetic field on the elastic scattering properties is studied by looking at thermalization of an initially non-thermal distribution in an optical dipole trap. While thermalizing, a significant number of atoms evaporates from the trap at a time scale determined by the scattering cross section. The remaining fraction of atoms is observed after 1 s and 3 s. The obtained result confirms the expectations with the most pronounced feature being a peak in the remaining fraction where the scattering length crosses zero.