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T: Fachverband Teilchenphysik

T 92: Neutrinophysik IV

T 92.4: Vortrag

Donnerstag, 22. März 2018, 17:20–17:35, Z6 - SR 2.012

The cosmic muon induced background in Gerda and its implications for Legend — •Christoph Wiesinger¹, Luciano Pandola², and Stefan Schönert¹ — ¹Physik-Department and Excellence Cluster Universe, Technische Universität München, Garching, Germany — ²INFN Laboratori Nazionali del Sud, Catania, Italy

In-situ production of long-lived isotopes by cosmic muon interactions may generate a non-negligible background for deep underground rare event searches. Previous Monte Carlo studies identified the delayed decay of ^77(m)Ge as dominant cosmogenic background in the search for neutrinoless double beta decay of ⁷⁶Ge. This might limit the sensitivity of next generation experiments and thereby define a minimum depth requirement. A re-evaluation of the ^77(m)Ge background for the Gerda (GERmanium Detector Array) experiment at Lngs (Laboratori Nazionali del Gran Sasso) has been carried out by a set of Monte Carlo simulations. State-of-the art active background suppression and simple delayed coincidence cuts lead to a background contribution of (2.7±0.3)·10⁻⁶ cts/(keV·kg·yr) at a reasonable life-time loss of < 4%. Exploiting this active suppression strategy opens the way for next generation rare event searches with Legend (Large Enriched Germanium Experiment for Neutrinoless ββ Decay) at Lngs. This work has been supported by the German Federal Ministry for Education and Research (BMBF) Verbundforschung 05A17W02 and the German Research Foundation (DFG) via the SFB1258.