Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 16: Neutrinoloser Doppelbeta-Zerfall I
T 16.5: Talk
Monday, February 29, 2016, 12:05–12:20, VMP9 SR 07
Performance of the LAr scintillation veto of Gerda Phase II — •Christoph Wiesinger for the GERDA collaboration — Physik-Department and Excellence Cluster Universe, Technische Universität München, James-Franck-Straße, 85748 Garching
Gerda is an experiment to search for the neutrinoless double beta decay in 76Ge. Results of Phase I have been published in summer 2013 and Gerda has been upgraded to Phase II. To reach the aspired background index of ∼ 10−3 cts/(keV·kg·yr) for Phase II active background-suppression techniques are applied, including an active liquid argon (LAr) veto. It has been demonstrated with the LArGe test facility that the detection of argon scintillation light can be used to effectively suppress background events in the germanium detectors, which simultaneously deposit energy in the LAr. The light instrumentation consisting of photomuliplier tubes (PMT) and wavelength-shifting fibers connected to silicon photomultipliers (SiPM) has been installed in Gerda. In this talk the low background design of the LAr veto and its performance during Phase II start-up will be reported.
This work was partly funded by BMBF.