Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Poster: Precision spectroscopy of atoms and ions (with Q)

A 20.15: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Search for the permanent electric dipole moment of ¹²⁹Xe — •Olivier Grasdijk⁴, Werner Heil¹, Sergei Karpuk¹, Anja Scharth¹, Yuri Sobolev¹, Kathlynne Tullney¹, Fabian Allmendinger², Ulrich Schmidt², Martin Burghoff³, Wolfgang Kilian³, Allard Schnabel³, Frank Seifert³, Lutz Trahms³, Klaus Jungmann⁴, and Lorenz Willmann⁴ — ¹Institut für Physik, Universität Mainz — ²Physikalisches Institut, Universität Heidelberg — ³PTB Berlin — ⁴KVI, University of Groningen

Permanent electric dipole moments (EDMs) violate parity and time reversal symmetry at the same time. Assuming CPT invariance a non-zero EDM would also violate CP symmetry, which could provide an explanation for the observed matter-antimatter asymmetry in the universe. An EDM at the present limit of experimental sensitivity would provides unambiguous evidence for physics beyond the Standard Model. Our approach is to observe the coherent spin-precession of co-located ³He/¹²⁹Xe polarized samples over extended periods of 1 day, typically. Based on results of measurements on Lorentz-invariance [1], we intend to reach a measurement sensitivity that will improve the present upper limit d_Xe = 3·10⁻²⁷ecm significantly. Phase I of this experiment will be performed in the magnetically shielded room BMSR-2 of the PTB Berlin using very sensitive SQUID gradiometers as magnetic flux detectors and electric fields of 2 kV/cm. The experimental setup, in particular the implementation of the electric field, and current status of work will be presented. [1] C.Gemmel et al., Eur. Phys. J D 47, 303 (2010; C.Gemmel et al., Phys. Rev D 82, 111901(R)(2010).