Precise measurements of S-wave scattering phase shifts with a luggling atomic clock

S. Gensemer, R. Hart, R. Martin, Xinye Xu, R. Legere, K. Gibble, S.J.J.M.F. Kokkelmans

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

We demonstrate an interferometric scattering technique that allows highly precise measurements of s-wave scattering phase shifts. We collide two clouds of cesium atoms in a juggling fountain clock. The atoms in one cloud are prepared in a coherent superposition of the two clock states and the atoms in the other cloud are prepared in one of the F,mF ground states. When the two clouds collide, the clock states experience s-wave phase shifts as they scatter off of the atoms in the other cloud. We detect only the scattered part of the clock atom's wavefunction for which the relative phase of the clock coherence is shifted by the difference of the s-wave phase shifts. In this way, we unambiguously observe the differences of scattering phase shifts. These phase shifts are independent of the atomic density to lowest order, enabling measurements of scattering phase shifts with atomic clock accuracy. Recently, we have observed the changes in scattering phase shifts as a function of magnetic field over a range of values where Feshbach resonances may be expected and where inelastic scattering channels open and close. A number of these measurements will precisely test and tightly constrain our knowledge of cesium-cesium interactions. With such knowledge, future measurements may place stringent limits on the time variation of fundamental constants, such as the electron-proton mass ratio, by precisely probing phase shifts near a Feshbach resonance.
Original languageEnglish
Title of host publicationPushing the frontiers of atomic physics : proceedings of the XXI International Conference on Atomic Physics, 27 July-1 August 2008, Storrs, Connecticut, USA
EditorsR. Côté, P.L. Gould, M. Rozman, W.W. Smith
PublisherWorld Scientific
Pages67-77
ISBN (Electronic)978-981-4468-05-3
ISBN (Print)978-981-4271-99-8
DOIs
Publication statusPublished - 1 Mar 2009
Event21st International Conference on Atomic Physics (ICAP 2008), July 27-August 1, 2008, Storrs, CT, USA - Storrs, CT, United States
Duration: 27 Jul 20081 Aug 2008

Conference

Conference21st International Conference on Atomic Physics (ICAP 2008), July 27-August 1, 2008, Storrs, CT, USA
Abbreviated titleICAP 2008
Country/TerritoryUnited States
CityStorrs, CT
Period27/07/081/08/08

Keywords

  • Precise measurements of s-wave scattering phase shifts
  • juggling fountain clock

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