Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Neutrino physics without accelerators III

T 68.1: Group Report

Wednesday, March 17, 2021, 16:00–16:20, Tr

Search for Neutrinoless Double-Beta Decay with LEGEND-200 — •Michael Willers for the LEGEND collaboration — Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München.

The Large Enriched Germanium Experiment for Neutrinoless ββ Decay (LEGEND) is a proposed ton-scale ⁷⁶Ge-based neutrinoless double-beta decay experimental program with discovery potential at a half-life greater than 10²⁸ years.

The first 200-kg phase (LEGEND-200) is currently under construction at the Gran Sasso underground laboratory (Laboratori Nazionale del Gran Sasso, LNGS, Italy) and commissioning of the experiment is scheduled to start in 2021. With a background index in the signal region of interest around Q_ββ = 2039 keV of 2 · 10⁻⁴ cts/(kev kg yr) and a data-taking period of 5 years, LEGEND-200 is expected to achieve a half-life sensitivity of 10²⁷ years. In this contribution, results from a first integration test (the so-called Post-GERDA Test) conducted in summer of 2020 as well as the current status of the experiment will be presented.
This work is supported in part by the Max-Planck Society, the German Federal Ministry for Education and Research (BMBF) and the German Research Foundation (DFG) via the SFB1258 and the cluster of excellence ORIGINS.