Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Astroteilchenphysik

HK 15.1: Gruppenbericht

Montag, 17. März 2014, 16:30–17:00, HZ 9

A liquid argon scintillation veto for the Gerda experiment — •Anne Wegmann for the GERDA collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

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 Gerda is being upgraded to a second phase. To reach the aspired background index of 10⁻³ cts/(keV·kg·yr) for Phase II 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.

This talk focusses on the light instrumentation which is being installed in GERDA. Photomultiplier tubes (PMT) and wavelength-shifting fibers connected to silicon photomultipliers (SiPM) are combined to maximize the photoelectron-yield with respect to various background sources. Monte Carlo simulations have been performed to optimize the design for background suppression and low self-induced background. First results of the prototypes and the progress of installation are reported.