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Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 113: Experimentelle Techniken der Astroteilchenphysik 1

T 113.2: Talk

Monday, February 27, 2012, 17:00–17:15, VG 0.110

Study of pulse shape discrimination for beta events on the n+ contact with BEGe detectors. — •Andrea Lazzaro1,2, Dusan Budjas1, Matteo Agostini1, and Stefan Schoenert11Physik-Department E15, Technische Universität München, Germany — 2UNIMIB, Milano, Italy

For the second phase of the Gerda experiment, bare BEGe detectors will be deployed in liquid argon. In the Gerda commissioning runs it was observed that the 42Ar progeny (42K) can create background at Qβ β, if the ions are attracted on the detector surface. Beta particles from 42K decays (Qβ≈3.5 MeV) can penetrate the thick Li layer of the detectors n+ contact surface and generate signals also at Qβ β. With BEGe detectors these events can be identified and discriminated via pulse shape analysis.

In this talk we present a study of surface beta events discrimination, using measurements of Sr and Ru sources with detectors in vacuum cryostats and the derived expected background suppression factor for 42K in LAr.

This work was supported by BMBF (05A11W01) and by the Munich Cluster of “Excellence Origin and Structure of the Universe”.

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