Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Fundamental Symmetries II
HK 41.2: Group Report
Wednesday, February 28, 2018, 17:00–17:30, HZO 100
Search for a Permanent Electric Dipole Moment of the 129Xe Atom — •Fabian Allmendinger1, Olivier Grasdijk3, Werner Heil2, Klaus Jungmann3, Hans-Joachim Krause4, Ulrich Schmidt1, Lorenz Willmann3, and Stefan Zimmer2 — 1Physikalisches Institut, Universität Heidelberg — 2Institut für Physik, Universität Mainz — 3University of Groningen — 4Peter Grünberg Institut, Forschungszentrum Jülich
A permanent electric dipole moment (EDM) of the 129Xe atom would imply a breakdown of both parity P and time-reversal symmetry T and, through the CPT theorem, a breakdown of CP, the combined symmetries of charge conjugation and parity. Our goal is to improve the present experimental limit (dXe < 3· 10−27 ecm). To get more stringent limits, we perform a 3He/129Xe clock comparison experiment with the detection of free spin precession of gaseous, nuclear polarized 3He and 129Xe samples with SQUIDs as magnetic flux detectors. The precession of co-located 3He/129Xe nuclear spins are used as an ultra-sensitive probe for non-magnetic spin interactions like the coupling of the EDM to an electric field. With our experimental setup at the research center Jülich we are able to observe spin coherence times T2* of several hours for both species. We report on technical improvements with first experimental results showing a factor of 10 higher EDM sensitivity achieved within the MIXed-collaboration.