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 Lazzaro^1,2, Dusan Budjas¹, Matteo Agostini¹, and Stefan Schoenert¹ — ¹Physik-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 Q_{β β}, if the ions are attracted on the detector surface. Beta particles from ⁴²K decays (Q_β≈3.5 MeV) can penetrate the thick Li layer of the detectors n⁺ contact surface and generate signals also at Q_{β 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”.