Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Instrumentation XIV

HK 53.3: Talk

Thursday, March 17, 2016, 15:00–15:15, S1/01 A4

Search for a permanent Xe-elecric dipole moment — •Stefan Zimmer for the MIXed collaboration — Institut für Physik, Universität Mainz

A permanent electric dipole moment (EDM) of the isotope ¹²⁹Xe would imply a breakdown of both parity P and time-reversal symmetry T and, through the CPT theorem, a breakdown in CP, the combined symmetries of charge conjugation C and parity P. Our goal is to improve the present experimental limit (d_Xe < 3 · 10⁻²⁷ ecm) by about three orders of magnitude. The most precise EDM limit on diamagnetic atoms was measured on ¹⁹⁹Hg (d_Hg < 3.1 · 10⁻²⁹ 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 or ¹²⁹Xe samples with a SQUID as magnetic flux detector. The precession of co-located ³He/¹²⁹Xe nuclear spins are used as an ultra-sensitive probe for non-magnetic spin interactions of type δν ∼ d_Xe · E. 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 first experimental results achieved within the MIXed-collaboration.