Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Astroteilchenphysik

HK 15.4: Talk

Monday, March 17, 2014, 18:00–18:15, HZ 9

BEGe detectors in GERDA Phase I - performance, physics analysis and surface events — •Andrea Lazzaro for the GERDA collaboration — Physik-Department E15, Technische Universität München, Germany

The Phase I of the Gerda experiment, which has concluded its data taking in Summer 2013, was based on coaxial HPGe detectors already used for IGEX and HdM experiments. In the upcoming Phase II customized Broad Energy Germanium (BEGe) detectors will provide the major contribution to the total exposure. The first set of BEGe detectors has been deployed in Gerda since June 2012.

The data collected in Phase I show the performance achieved in terms of spectroscopy and pulse shape discrimination. In particular the strongest background source, the ⁴²K beta decay from the liquid argon surrounding the detectors, has been effectively rejected. The signals due to beta decay on the detector surface are indeed characterized by a longer charge collection time. This talk will focus on this key feature of the BEGe-PSD.

This work was supported in part by BMBF (05A11W01).