/ Experiment-HEP

LArGe R&D for active background suppression in GERDA

Agostini, M. (Heidelberg, Max Planck Inst.) ; Barnabe-Heider, M. (Heidelberg, Max Planck Inst.) ; Budjas, D. (Heidelberg, Max Planck Inst.) ; Cattadori, C. (Milan U.) ; D'Andragora, A. (Milan U.) ; Gangapshev, A. (Moscow, INR) ; Gusev, K. (Kurchatov Inst., Moscow) ; Heisel, M. (Heidelberg, Max Planck Inst.) ; Junker, M. (Gran Sasso) ; Klimenko, A. (Dubna, JINR) ; Schonert, S. (Heidelberg, Max Planck Inst.) ; Smolnikov, A. (Dubna, JINR) ; Zuzel, G. (Heidelberg, Max Planck Inst.)

Published in: J.Phys.Conf.Ser.
Year: 2012
Vol.: 375
Page No: 042009
Pages: 4

Abstract: LArGe is a GERDA low-background test facility to study novel background suppression methods in a low-background environment, for future application in the GERDA experiment. Similar to GERDA, LArGe operates bare germanium detectors submersed into liquid argon (1 m(3), 1.4tons), which in addition is instrumented with photomultipliers to detect argon scintillation light. The light is used in anti-coincidence with the germanium detectors to effectively suppress background events that deposit energy in the liquid argon. The background suppression efficiency was studied in combination with a pulse shape discrimination (PSD) technique using a BEGe detector for various sources, which represent characteristic backgrounds to GERDA. Suppression factors of a few times 10(3) have been achieved. First background data of LArGe with a coaxial HPGe detector (without PSD) yield a background index of the order 10(-')(2) cts/(keV-kg-y), which is at the level of the GERDA phase I design goal. As a consequence of these results, the development of an active liquid argon veto in GERDA is pursued.

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DOI: 10.1088/1742-6596/375/1/042009
 Record created 2012-10-02, last modified 2014-01-30

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