Direct Observation of Resonant Scattering Phase Shifts and their Energy Dependence

Abstract

We scan the collision energy of two clouds of cesium atoms between 12 and 50 $\mu$K in atomic fountain clock. By directly detecting the difference of s-wave scattering phase shifts, we observe a rapid variation of a scattering phase shift through a series of Feshbach resonances. At the energies we use, resonances that overlap at threshold become resolved. Our statistical phase uncertainty of 8 mrad can be improved in future precision measurements of Feshbach resonances to accurately determine the Cs-Cs interactions, which may provide stringent limits on the time variation of fundamental constants.

References in corpus (10)

• Feshbach Resonances in Ultracold Gases
• Metastability and Coherence of Repulsive Polarons in a Strongly Interacting Fermi Mixture
• Controlled Collapse of a Bose-Einstein Condensate
• Interferometric determination of the s- and d-wave scattering amplitudes in ${}^{87}$Rb
• Imaging of s and d partial-wave interference in quantum scattering of identical bosonic atoms
• Realization of a Resonant Fermi Gas with a Large Effective Range
• Enhancement of variation of fundamental constants in ultracold atom and molecule systems near Feshbach resonances
• A Quantum Scattering Interferometer
• Feshbach resonances in Cesium at Ultra-low Static Magnetic Fields
• Sensitivity to alpha-variation in ultracold atomic-scattering experiments

Cited by in corpus (7)

• Tailored single-atom collisions at ultra-low energies
• Observation of bound state self-interaction in a nano-eV atom collider
• Above threshold scattering about a Feshbach resonance for ultracold atoms in an optical collider
• Atomic Clock Measurements of Quantum Scattering Phase Shifts Spanning Feshbach Resonances at Ultralow Fields
• Proposal to directly observe the Kondo effect through enhanced photo-induced scattering of cold fermionic and bosonic atoms
• Cross-dimensional relaxation of ${}^7$Li-${}^{87}$Rb atomic gas mixtures in a spherical-quadrupole magnetic trap
• Quantum Scattering in an Optical Collider for Ultracold Atoms