Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Fundamentale Symmetrien

HK 33.2: Group Report

Wednesday, March 21, 2012, 17:00–17:30, P 1

The new neutron EDM experiment at the FRM-II — •Tobias Lins — Technische Universität München, Physikdepartment, James-Franck-Str. 1, 85748 Garching, Germany

Since the 1950's people have been searching for electric dipole moments (EDMs) of fundamental paticles. This is a very promising approach to find yet unknown manifestations of broken underlying symmetries in the early Universe. Although these experiments are among the most precise in physics, no EDM has been observed so far. In this talk a next generation approach with a sensitivity of < 5.10-28 ecm (3 sigma) for the neutron EDM based at the FRM-II neutron source will be presented. Ramsey's method of separated oscillatory fields is applied to trapped ultra-cold neutrons (UCNs) in vacuum. For the investigation of systematic effects a sophisticated strategy of various means to control ambient parameters on an unprecedented level of accuracy is currently being set up. The construction is planned to be finished by end of 2013, followed by the first measurements with UCNs in 2014. An overview of the overall strategy, main systems for magnetic field control and magnetometry, as well as the current status of the ongoing implementation on site will be shown.