Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 38: Methods in Astroparticle Physics II

T 38.5: Vortrag

Dienstag, 17. März 2026, 17:15–17:30, KS 00.004

Low-Background Gamma Spectrometry for LEGEND — Hannes Bonet¹, •Patrick Bongratz¹, Benjamin Gramlich¹, Manuel Huber², Matthias Laubenstein³, Susanne Mertens¹, Hardy Simgen¹, Herbert Strecker¹, and Edgar Sanchez Garcia¹ for the LEGEND collaboration — ¹Max Planck Institut für Kernphysik, Heidelberg — ²Technische Universität München, Garching — ³Laboratori Nazionali del Gran Sasso (LNGS)

Low-background experiments depend on minimizing radioactive contamination in detector materials. For example, in the Large Enriched Germanium Experiment for Neutrinoless ββ Decay (LEGEND), all materials are screened for radioisotopes to achieve this high radiopurity. This is commonly done by gamma spectroscopy using low-background, high-purity Germanium (HPGe) spectrometers. Operating these spectrometers in an underground laboratory reduces the cosmic background for the measurement. In this talk, I present on HPGe-spectrometers operated at 15 m.w.e. in Heidelberg (Germany) and at 3800 m.w.e. at LNGS (Italy). I describe how measurements from these detectors are used to derive the total background budget for the LEGEND-1000 experiment and to fix radiopurity requirements for its components. Sample-specific detection efficiencies are determined using the Geant4-based simulation framework remage.

Keywords: Neutrinoless double beta decay; HPGe-detector; Rare event search; Gamma spectroscopy; LEGEND