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T: Fachverband Teilchenphysik

T 108: Niederenergie-Neutrinophysik/Suche nach dunkler Materie V

T 108.4: Talk

Friday, April 1, 2011, 14:50–15:05, 30.95: 121

First Results of the Gerda Muon Veto — •Freund Kai, Grabmayr Peter, Hegai Alexander, Jochum Josef, Meierhofer Georg, and Ritter Florian — Eberhard Karls Universität Tübingen, Germany

The Gerda collaboration aims to determine the half life of the neutrinoless double beta decay (0νββ) of ⁷⁶Ge. Due to the long half life of this decay (T_1/2>10²⁵ y), the experimental background must be reduced to a level of 10⁻² cts/(keV · kg · a) or better in the region around Q_ββ. Cosmic muons induce a part of this dangerous background and must be vetoed. Part of this veto is a water Cherenkov detector surrounding the cryostat which contains the germanium crystals. This veto was designed and installed by the astroparticle group in Tübingen. The veto consists of 66 photomultipliers (8 inch), a calibration and monitoring system, reflective VM2000 foil and a DAQ system. In this talk first results from the veto are presented and compared to MC simulations.

[1] The GERmanium Detector Array, Proposal to LNGS, 2004.
This work was supported by BMBF (05A08VT1).