SMuK 2023 – scientific programme
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T: Fachverband Teilchenphysik
T 15: Neutrinos, Dark Matter III
T 15.4: Talk
Monday, March 20, 2023, 17:15–17:30, POT/0006
The LEGEND Experiment - Status of commissioning and outlook — •Simon Sailer for the LEGEND collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
The LEGEND experiment searches for the neutrino-less double beta (0νββ) decay of the germanium isotope 76Ge which would reveal the Majorana nature of neutrinos and prove lepton number non-conservation. The first stage of experiment (LEGEND-200) is built at the underground facility of LNGS in Italy. Here close to 200 kg of enriched high-purity germanium detectors (∼ 88% 76Ge) are being deployed providing a discovery sensitivity for the half-life of the 0νββ decay of >1027 yr. within 5 years of measurement. The detectors are emerged in a liquid argon cryostat which simultaneously provides the coolant, a gamma-radiation shield and active veto system. The cryostat itself is surround by a large water tank acting as an additional neutron shield and muon-veto. LEGEND-200 is ending it’s commissioning phase and switches to standard operations. Meanwhile the preparations for the second stage (LEGEND-1000) increasing the detector mass to 1 tonne are making great strides which will increase the sensitivity to >1028 yr. A non-observation would probe the effective Majorana neutrino mass mββ in the range of 10-20 meV and allow the exclusion of the inverted mass ordering.