Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Fundamentale Symmetrien
HK 33.3: Vortrag
Mittwoch, 21. März 2012, 17:30–17:45, P 1
Uncompensated magnetic field drifts in the nEMD experiment at Paul Scherrer Institute — •Johannes Zenner — Johannes Guttenberg Universität, Mainz, Deutschland — Paul Scherrer Institut, Villigen, Schweiz
A non-zero value of the neutron electric dipole moment (nEDM) would violate both time (T) and parity (P) symmetry. The current experimental upper limit is dn < 2.9 x 10−26 e cm, 90 % CL [ C. A. Baker et al., PRL 97, 131801 (2006) ]. The nEDM collaboration installed the experiment that has set the current limit at the new source for ultracold neutrons (UCN) at the Paul Scherrer Institute. Our goal is to increase the sensitivity by two orders of magnitude. That way one could confirm or exclude extensions of the standard model which introduce new sources of CP violation. To make use of the increased neutron intensity at the new UCN source a crucial task is to understand systematic effects at a corresponding level. A major systematic uncertainty is related to magnetic fields that could be created by the high voltage system of the experiment and are not fully compensated with the mercury co-magnetometer. This talk will cover our studies of this influence using an array of optical Cesium magnetometers.