title: First Measurement of the Atomic Electric Dipole Moment of (225)Ra.
abstract: The radioactive radium-225 ((225)Ra) atom is a favorable case to search for a permanent electric dipole moment. Because of its strong nuclear octupole deformation and large atomic mass, (225)Ra is particularly sensitive to interactions in the nuclear medium that violate both time-reversal symmetry and parity. We have developed a cold-atom technique to study the spin precession of (225)Ra atoms held in an optical dipole trap, and demonstrated the principle of this method by completing the first measurement of its atomic electric dipole moment, reaching an upper limit of |d((225)Ra)|<5.0×10(-22)  e cm (95% confidence).
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.|Department of Physics and Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: R H
authors.initials: RH
authors.lastname: Parker
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.|Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: M R
authors.initials: MR
authors.lastname: Dietrich
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.|Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
authors.forename: M R
authors.initials: MR
authors.lastname: Kalita
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: N D
authors.initials: ND
authors.lastname: Lemke
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: K G
authors.initials: KG
authors.lastname: Bailey
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: M
authors.initials: M
authors.lastname: Bishof
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Greene
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Holt
authors.affiliation: Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
authors.forename: W
authors.initials: W
authors.lastname: Korsch
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.|Department of Physics and Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Z-T
authors.initials: ZT
authors.lastname: Lu
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: P
authors.initials: P
authors.lastname: Mueller
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: T P
authors.initials: TP
authors.lastname: O'Connor
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.|National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: J T
authors.initials: JT
authors.lastname: Singh