Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 109: Niederenergie-Neutrinophysik und Suche nach dunkler Materie III

T 109.5: Vortrag

Mittwoch, 17. März 2010, 15:05–15:20, HG XI

The Installation of the Gerda Muon Veto — •Kai Freund, Dennis Dietrich, Peter Grabmayr, Alexander Hegai, Josef Jochum, Markus Knapp, Georg Meierhofer, and Florian Ritter — Kepler Center for Astro and Particle Physics, 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 at least to a level of 10⁻³ counts/(kg·y·keV) in the region around Q_ββ. Cosmic muons induce a part of this dangerous background and must be detected in order to generate a veto signal. Part of this veto system is a water Cherenkov detector surrounding the cryostat which contains the germanium crystals. The Cherenkov veto was simulated, designed and installed by the astroparticle group in Tübingen. The veto consists of 66 photomultiplier (8 inch), a calibration and monitoring system, reflective VM2000 foil and the control electronics. In this talk the veto, its design and accomplished installation is presented.

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