Abstract
We use an atomic fountain clock to measure quantum scattering phase shifts precisely through a series of narrow, low-field Feshbach resonances at average collision energies below . Our low spread in collision energy yields phase variations of order for target atoms in several , states. We compare them to a theoretical model and establish the accuracy of the measurements and the theoretical uncertainties from the fitted potential. We find overall excellent agreement, with small statistically significant differences that remain unexplained.
- Received 12 June 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.113401
© 2017 American Physical Society