2015/09/30 by Dina Genkina, Lauren M. Aycock, Genkina, Dina +9
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Quantum Gases (cond-mat.quant-gas) #Quantum Physics (quant-ph) #cond-mat.quant-gas #physics.atom-ph #quant-ph
paper · pdf · doi:10.48550/arxiv.1510.00036
22 pages, 11 figues
arxiv created 2015/10/08 · arxiv updated 2015/10/09
We directly measured the normalized \its-wave scattering cross-section of ultracold 40\rmK atoms across a magnetic-field Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. We extracted the scattered fraction for a range of bias magnetic fields, and measured the resonance location to be B0 = 20.206(15) mT with width Δ= 1.0(5) mT. To optimize the signal-to-noise ratio of atom number in scattering images, we developed techniques to interpret absorption images in a regime where recoil induced detuning corrections are significant. These imaging techniques are generally applicable to experiments with lighter alkalis that would benefit from maximizing signal-to-noise ratio on atom number counting at the expense of spatial imaging resolution.