Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Fundamental Symmetries II

HK 41.2: Gruppenbericht

Mittwoch, 28. Februar 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 (d_Xe < 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.