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HK: Fachverband Physik der Hadronen und Kerne

HK 70: Instrumentation 20

HK 70.4: Talk

Friday, March 27, 2015, 15:30–15:45, M/HS2

Performance of the LAr scintillation veto of GERDA Phase II — •Christoph Wiesinger for the GERDA collaboration — Technische Universität München, Physik Dep., E15, 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 is 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, which simultaneously deposit energy in the LAr. The light instrumentation consisting of photomuliplier tubes (PMT) and wavelength-shifting fibers connected to silicon multipliers (SiPM) has been installed in Gerda. In this talk the low background design of the LAr veto and its performance during the comissioning runs will be reported.

This work was partly funded by BMBF 05A14W03.