Genkina, D.
, Aycock, L.
, , H.
, Spielman, I.
and Stuhl, B.
(2015),
Direct observation of Feshbach enhanced s-wave scattering of fermions, New Journal of Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919309
(Accessed October 16, 2025)
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Direct observation of Feshbach enhanced s-wave scattering of fermions
Published
Author(s)
, , , , Benjamin K. Stuhl
Abstract
We directly measured the s-wave scattering cross-section of ultracold 40K atoms across the 20.2 mT Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. Owing to DFGs low density, few atoms scattered, even near the resonance. To optimize signal to noise, we developed techniques to interpret absorption images in the regime where recoil induced detuning corrections are significant. By applying these techniques to our s-wave scattering data we extracted the resonant magnetic field value B0 = 20.247(2) mT and resonance width ∆ = 1.0(1) mT. These imaging techniques are generally applicable to experiments with light atoms in which maximizing the signal-to-noise ratio on the atom number counting is critical and imaging resolution can be sacrificed.Citation
New Journal of Physics
Pub Type
Journals
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Keywords
Quantum gases, Atomic physics
Citation
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Created December 17, 2015, Updated February 19, 2017