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T: Fachverband Teilchenphysik

T 105: Experimentelle Methoden der Astroteilchenphysik 4

T 105.5: Vortrag

Donnerstag, 27. März 2014, 17:45–18:00, P7

Dead layer and active volume determination of enriched BEGe detectors for the GERDA experiment — •Raphael Falkenstein for the GERDA collaboration — Eberhard Karls Universität Tübingen, Germany

The Gerda experiment is designed to search for the neutrinoless double beta (0νββ) decay of ⁷⁶Ge. It uses bare High-Purity Germanium detectors, enriched in ⁷⁶Ge that are operated in liquid argon.
In GERDA phase I (Nov 2011-May 2013) mainly semi-coaxial Ge detectors were deployed. In phase II, which is planned to start in spring 2014, 30 new Broad Energy Germanium (BEGe) detectors will be added. The detectors have been tested in the HADES underground laboratory at SCK•CEN in Belgium, close to the detector manufacturer.
For GERDA, one of the key parameters and major source of systematic uncertainties is the active volume fraction of the detectors, since it directly affects the half life analysis. In this contribution, precise techniques for the dead layer and active volume determination using different calibration sources are presented. In addition, the DL and AV results as well as their systematic uncertainties will be discussed.
This work was partly supported by the BMBF.