Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 75: Neutrino Physics without Accelerators 6

T 75.4: Talk

Wednesday, March 23, 2022, 17:05–17:20, T-H34

First light in LEGEND-200 — •Rosanna Deckert, Patrick Krause, Laszlo Papp, and Stefan Schönert — Technische Universität München

LEGEND (Large Enriched Germanium Experiment for Neutrinoless β β Decay) is a ton-scale experiment to search for neutrinoless double beta (0 ν β β) decay using high-purity germanium detectors enriched in ⁷⁶Ge. An observation of 0 ν β β decay would prove the existence of lepton number violation and provide insight into the nature of neutrino masses. The first phase of the experiment LEGEND-200 will deploy 200 kg of enriched material and aims for a sensitivity of 10²⁷ years on the 0 ν β β half-life. To achieve this, the germanium detectors will be operated in liquid argon (LAr), instrumented as an active detector to detect the scintillation light produced by backgrounds from trace radioactive contaminants.
Commissioning of the LAr instrumentation, consisting of wavelength-shifting fibers, a wavelength-shifting reflector and silicon photomultiplier arrays, started in August 2021 at the Laboratori Nazionali del Gran Sasso. In this talk, the analysis of the first LAr commissioning data for LEGEND-200 will be presented.
This research is supported by the BMBF through the Verbundforschung 05A20WO2 and by the DFG through the Excellence Cluster ORIGINS and the SFB1258.