Wuppertal 2015 – scientific programme
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T: Fachverband Teilchenphysik
T 10: Niederenergie Neutrinophysik I
T 10.5: Talk
Monday, March 9, 2015, 15:10–15:25, I.12.01 (HS 30)
LAr instrumentation for Gerda Phase II — •Anne Wegmann for the GERDA collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland
Gerda is an experiment to search for the neutrinoless double beta decay of 76Ge. Results of Phase I have been published in summer 2013. Currently the commissioning of Gerda Phase II is ongoing. To reach the aspired background index of 10−3 cts/(keV·kg·yr) active background-suppression techniques will be applied, including an active liquid argon veto (LAr veto).
It has been demonstrated by 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 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.