Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Astroteilchenphysik
HK 7.5: Talk
Monday, March 4, 2013, 12:15–12:30, HSZ-401
Pulse shape discrimination studies of Phase I Ge-detectors — •Andrea Kirsch — MPI für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
The GERmanium Detector Array experiment aims to search for the neutrinoless double beta decay (0νββ) of 76Ge by using isotopically enriched germanium crystals as source and detector simultaneously. The bare semiconductor diodes are operated in liquid argon at cryogenic temperatures in an ultra-low background environment.
In addition, Gerda applies different active background reduction techniques, one of which is pulse shape discrimination studies of the current Phase I germanium detectors. The analysis of the signal time structure provides an important tool to distinguish single site events (SSE) of the ββ-decay from multi site events (MSE) of common gamma-ray background or surface events. To investigate the correlation between the signal shape and the interaction position, a new, also to the predominantly deployed closed-ended coaxial HPGe detectors applicable analysis technique has been developed.
A summary of the used electronic/detector assembly is given and will be followed by a discussion of the performed classification procedure by means of accurate pulse shape simulations of 0νββ-like signals. Finally, the obtained results will be presented along with an evaluation of the relevance for the Gerda experiment.