Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 16: Neutrinoloser Doppelbeta-Zerfall I
T 16.2: Talk
Monday, February 29, 2016, 11:20–11:35, VMP9 SR 07
In-situ measurement of the light attenuation in liquid argon in the GERDA cryostat — •Birgit Schneider for the GERDA collaboration — TU Dresden, Institut für Kern- und Teilchenphysik, Germany
GERDA is an experiment searching for neutrinoless double beta decay in 76Ge. It operates the enriched germanium detectors bare in liquid argon (LAr), which serves both as a coolant and a shield for external radiation. Phase II of GERDA aims for an exposure of 100 kg · yr with a background index (BI) of 10−3 cts/(kg · yr · keV). One of the major improvements to further reduce the BI comes from the instrumentation of the LAr to readout its scintillation light. The attenuation of the scintillation light in LAr limits the effective active volume of the LAr veto and is therefore a key parameter to characterize the instrumentation.
In order to measure the light attenuation in LAr, a setup was designed that could be deployed directly into the GERDA cryostat. This setup contains a movable beta source and a PMT to detect the scintillation light at different distances.
The talk will present the acquired data as well as a detailed description of the performed analysis technique and the current results.
This project is partially funded by BMBF.