Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 61: Fundamental Symmetries
HK 61.7: Vortrag
Mittwoch, 18. März 2009, 18:15–18:30, H-ZO 70
A new measurement of the electric dipole moment of 129-Xe — Peter Fierlinger1, •Florian Kuchler1, Klaus Kirch2, Ralph DeVoe3, Marlon Horras2, and Gerd Petzold2 — 1TU München / Excellence-Cluster 'Universe', Garching, Germany — 2Paul Scherrer Institut, Schweiz — 3Stanford University, USA
Since the 1950's people search for electric dipole moments (EDM) of fundamental systems, an unambiguous manifestation of parity (P) and time reversal (T) symmetry violation. Although the Standard Model (SM) predicts very small values for EDMs, extentions of the SM (eg. Supersymmetry) require large EDMs, which are within the reach of next generation experiments. Besides the neutron as the most prominent example of an EDM search, diamagnetic atoms like 199-Hg set strong limits d_Hg < 2.1E-28 ecm. We present a novel approach to measure the EDM of the diamagnetic atom 129-Xe by a novel method, based on liquid hyper-polarized 129-Xe droplets condensed in a micro-fabricated structure. Due to the large density of the liquid, the size of the experiment can be minimized. This enables a conceptually new stratey to measure an EDM by applying rotating electric fields in the spin-precession plane. This method, where the EDM and the Larmor-precession are independent effects, can be used in addition to the 'conventional' Ramsey technique. Due to the small size also stability and gradients of the magnetic field can be controlled on an unprecedented level, using low-temperature SQUID magnetometry. Systematic effects, in particular motional effects, are controlled by performing an array of experiments in parallel on the same chip with different conditions.