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• W2593249840 abstract "LArGe is a Gerda low-background test facility to study novel background suppression methods in a low-background environment, for future application in the Gerda experiment. Similar to Gerda, LArGe operates bare germanium detectors submersed into liquid argon (1 m $$^3$$ , 1.4 tons), which in addition is instrumented with photomultipliers to detect argon scintillation light. The scintillation signals are used in anti-coincidence with the germanium detectors to effectively suppress background events that deposit energy in the liquid argon. The background suppression efficiency was studied in combination with a pulse shape discrimination (PSD) technique using a BEGe detector for various sources, which represent characteristic backgrounds to Gerda. Suppression factors of a few times $$10^3$$ have been achieved. First background data of LArGe with a coaxial HPGe detector (without PSD) yield a background index of (0.12 $$-$$ 4.6) $$times 10^{-2}$$ cts/(keV kg year) (90 % C.L.), which is at the level of Gerda Phase I. Furthermore, for the first time we monitor the natural $$^{42}$$ Ar abundance (parallel to Gerda), and have indication for the $$2nu beta beta $$ -decay in natural germanium. These results show the effectivity of an active liquid argon veto in an ultra-low background environment. As a consequence, the implementation of a liquid argon veto in Gerda Phase II is pursued." @default.
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• W2593249840 date "2015-10-01" @default.
• W2593249840 modified "2023-10-17" @default.
• W2593249840 title "LArGe: active background suppression using argon scintillation for the Gerda $$0nu beta beta $$ 0 ν β β -experiment" @default.
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• W2593249840 doi "https://doi.org/10.1140/epjc/s10052-015-3681-5" @default.
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