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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Fundamentale Symmetrien

HK 44.2: Vortrag

Mittwoch, 23. März 2011, 17:00–17:15, HS2

Recent improvements of the Hg cohabiting magnetometer for the nEDM experiment at PSI — •Martin Fertl — Paul Scherrer Institut, Villigen, Schweiz

The Standard Model (SM) of Particle Physics predicts a static electric dipole moment for the neutron (nEDM), breaking time reversal and parity symmetry. This prediction is several orders of magnitude below the current best experimental limit d_n < 2.9 · 10⁻²⁶ ecm (90 % CL). An experiment at the new ultra-cold neutron (UCN) source at the Paul Scherrer Institut (PSI), Switzerland, aims at a factor five improved sensitivity. Ultimately, the collaboration pursues the goal to improve the sensitivity by another order of magnitude. The experiment employs Ramsey’s method of separated oscillatory fields to detect a Larmor frequency shift for the UCN in a parallel and an anti-parallel configuration of a magnetic and an electric field. The transmission modulation of a circularly polarized light beam is used to detect the spin precession of a spin polarized ensemble of ¹⁹⁹Hg atoms in the same volume as the UCN and thus to measure the applied magnetic field (≈ 1µT). Currently we reach a precision of 50ḟT over 100ṡ. I will present recently achieved improvements of this co-magnetometer and ideas how to further improve this magnetometer by using a laser as light source.