Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 116: Experimentelle Techniken der Astroteilchenphysik 4

T 116.4: Talk

Thursday, March 1, 2012, 17:35–17:50, VG 0.110

GERDA phase II detectors and acceptance tests — •Victoria Wagner — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg

The GERDA collaboration aims at searching for the neutrinoless double beta decay of ⁷⁶Ge into ⁷⁶Se. It uses enriched Ge detectors that are operated in liquid argon. Phase I of the experiment started with a target mass of approximately 20 kg on November 1, 2011, and it will last for 1 year. Phase II is in preparation and envisions the installation of at least 25 new Broad Energy Ge detectors (BEGe) that will increase the target mass by nearly 20 kg. These detectors, however, have to be extensively tested prior to their usage.
The talk briefly reviews the preparation of the detector screening campaign and focuses on the corresponding acceptance test strategy. The tests include energy resolution and leakage current measurements, dead layer and active volume determination, as well as the pulse shape discrimination efficiencies of the detectors. Finally we present results obtained with depleted BEGe detectors that are used for the optimization of the enriched ones during the acceptance tests.