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T: Fachverband Teilchenphysik

T 22: Neutrino Physics II

T 22.4: Talk

Tuesday, March 17, 2026, 17:00–17:15, AudiMax

LEGEND-200: Recent results and experimental status — •Nadezda Rumyantseva for the LEGEND collaboration — Department of Physics, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching b. München, Germany

LEGEND is a staged program progressing from LEGEND–200 to the ton-scale LEGEND–1000, searching for neutrinoless double-beta decay (0νββ) in ⁷⁶Ge. Using enriched high-purity germanium detectors, LEGEND targets discovery sensitivity to half-lives beyond 10²⁸ years.

LEGEND builds on the GERDA and MAJORANA Demonstrator experiments and employs novel inverted-coaxial HPGe detectors operated in instrumented liquid argon, providing powerful signal identification and background rejection capabilities. The first LEGEND–200 physics results are based on an exposure of 61.0 kg yr and, in combination with GERDA and the MAJORANA Demonstrator, achieve a world-leading 90% confidence-level exclusion sensitivity of 2.8×10²⁶ yr and set a lower limit of T_1/2^0ν > 1.9×10²⁶ yr.

This talk summarizes the LEGEND–200 experimental concept, background-reduction strategy, and latest results.

We acknowledge support from the DFG under Germany’s Excellence Strategy – EXC 2094 (ORIGINS) and through the Sonderforschungsbereich SFB 1258. We also acknowledge support from the BMFTR Verbundprojekt 05A2023 (LEGEND).

Keywords: germanium detectors; neutrinoless double beta-decay; SiPM; LAr instrumentation; PSD