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SYDM: Symposium Dipole Moments - A Tool to Search for New Physics

SYDM 1: Session 1

SYDM 1.3: Gruppenbericht

Dienstag, 24. März 2015, 12:20–12:40, C/gHS

Search for the Electric Dipole Moment of ²²⁵Ra — •Peter Mueller¹, Kevin Bailey¹, Michael Bishof¹, Matthew Dietrich², John Greene¹, Roy Holt¹, Mukut Kalita³, Wolfgang Korsch³, Nathan Lemke¹, Zheng-Tian Lu^1,4, Thomas O’Connor¹, Richard Parker⁴, and Jaideep Singh⁵ — ¹Argonne National Laboratory — ²Northwestern University — ³University of Kentucky — ⁴University of Chicago — ⁵Michigan State University

²²⁵Ra (τ _1/2 = 15 d, I=1/2) is a promising isotope for EDM searches in diamagnetic atoms and the corresponding quest for physics beyond the Standard Model. Due to its large nuclear octupole deformation and high Z, the EDM sensitivity of ²²⁵Ra is expected to be 2-3 orders of magnitude larger than that of ¹⁹⁹Hg, which to date sets the best EDM limit in this sector. We have developed an efficient multiple-stage apparatus to laser cool and trap radium atoms and to transfer them via optical dipole traps into a magnetically-shielded science chamber, where they are spin polarized and then allowed to precess in magnetic and electric fields. We will report on the results of the first EDM measurement of ²²⁵Ra as well as plans for future improvements. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.