Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 109: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 4

T 109.4: Talk

Tuesday, February 28, 2012, 17:35–17:50, ZHG 103

BEGe detector response to alpha and beta-radiation near its p⁺ electrode — •Tobias Bode, Matteo Agostini, Marik Barnabé-Heider, Dusan Budjas, and Stefan Schönert — Technische Universität München, Germany

In Phase II of the GERDA (Germanium Detector Array) experiment Broad Energy Germanium (BEGe) detectors will continue the search for the neutrinoless double beta decay (0νββ) of ⁷⁶Ge. The main feature of these detectors is their small p⁺ electrode used for signal read-out. Due to the thin dead layer of the p⁺ contact, surface events close to this electrode represent a potential background for the search of 0νββ. A study was conducted to determine the response of the detector to alpha and beta-radiation using movable collimated sources within a custom-build cryostat. Preliminary results of this study and a possible method to discriminate these events will be presented. This work was supported by BMBF 05A11W01 and by the Munich Cluster of Excellence Origin and Structure of the Universe.