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HK: Fachverband Hadronen und Kerne

HK 74: Fundamental Symmetries

HK 74.4: Talk

Thursday, March 19, 2009, 17:30–17:45, H-ZO 70

Search for scalar interaction with the WITCH experiment - status & outlook — •Peter Friedag¹, Marcus Beck¹, Jonas Mader¹, Christian Weinheimer¹, Nausikaa Geraert², Nathal Severijns², Michael Tandecki², Emil Traykov², Simon van Gorp², Frederik Wauters², and Alexander Herlert³ — ¹Institut für Kernphysik, WWU Münster, Wilhelm-Klemm Str. 9, 48149 Munster, Germany — ²Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium — ³CERN, CH-1211 Geneve 23, Switzerland

The WITCH experiment examines the nuclear beta decay of ions stored in a penning trap using a retardation spectrometer. With this experiment we measure the recoil spectrum, from which one can derive the beta neutrino angular correlation a. This allows us to search for a scalar interaction contribution in the weak interaction. The goal is to measure a with a precision of Δ a<0.5%.

In 2008 and 2009 various enhancements of the experimental setup have been carried out. Therefore many components of the system were modified and upgraded. In support of this, we performed tracking simulations and field calculations, that were also used for a further analysis of the measurement from 2006. This talk reviews the current status of the simulations as well as the experiment and gives an outlook for this year.

This project is supported by BMBF under contract number 06MS270.