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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Astroteilchenphysik
HK 7.4: Talk
Monday, March 4, 2013, 12:00–12:15, HSZ-401
Consistency check of Pulse Shape Discrimination for Broad Energy Germanium Detectors using double beta decay data — •Heng-Ye Liao — Max-Planck-Institut für Physik, München
The Gerda (GERmanium Detector Array) experiment was built to study fundamental neutrino properties via neutrinoless double beta decay (0νββ). 0νββ events are single-site events (SSE) confined to a scale about millimeter. However, most of backgrounds are multi-site events (MSE). Broad Energy Germanium detectors (BEGes) offer the potential merits of improved pulse shape recognition efficiencies of SSE/MSE. They allow us to reach the goal of Phase II with a background index of 10−3 cts/(keV·kg·yr) in the ROI. BEGe detectors with a total target mass of 3.63 kg have been installed to the Gerda setup in the Laboratori Nazionali del Gran Sasso (LNGS) in July 2012 and are collecting data since. A consistency check of the pulse shape discrimination (PSD) efficiencies by comparison of calibration data and 2νββ data will be presented. The PSD power of these detectors is demonstrated.