Direct observation of resonant scattering phase shifts and their energy dependence

Stephen D. Gensemer, Ross B. Martin-Wells, Aaron W. Bennett, Kurt Gibble

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We scan the collision energy of two clouds of cesium atoms between 12 and 50 μK in an 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.

Original languageEnglish (US)
Article number263201
JournalPhysical review letters
Issue number26
StatePublished - Dec 26 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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