Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Astroteilchenphysik
HK 15.3: Gruppenbericht
Montag, 17. März 2014, 17:30–18:00, HZ 9
Background reduction at low energies with BEGe detector operated in liquid argon using the Gerda-LArGe facility — •Dušan Budjáš for the GERDA collaboration — Physik-Department E15, Technische Universität München, Germany
LArGe is a low background test facility used for proving innovative approaches to background reduction in support of the neutrinoless double beta decay experiment Gerda. These approaches include an anti-Compton veto using scintillation light detection from liquid argon, as well as a novel pulse shape discrimination method exploiting the characteristic electrical field distribution inside BEGe detectors. The latter technique can identify single-site events (typical for double beta decays) and efficiently reject multi-site events (typical for backgrounds from gamma-ray interactions), as well as different types of background events from detector surfaces.
While the main focus of the LArGe facility is to assist with reaching the goal of Gerda – improving the sensitivity for 76Ge neutrinoless double beta decay search, reducing the background at low energies and lowering the energy threshold is also of interest. In particular such efforts can be potentially relevant for search of dark matter or low energy neutrino interactions. In this talk I will present the experimental measurement of the low energy region with a BEGe detector operated in LArGe with the application of powerful background suppression methods. The performance will be compared to that of some dedicated dark matter detection experiments.