Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 23: Experimental Techniques in Astroparticle Physics 1

T 23.2: Vortrag

Montag, 21. März 2022, 16:30–16:45, T-H36

Biases in the ⁷⁶Ge 0νββ tagging from calibrations — •Tommaso Comellato¹, Matteo Agostini^1,2, and Stefan Schönert¹ — ¹Technical University of Munich, Garching bei München, Germany — ²University College London, London, United Kingdom

The analysis of the time profile of electrical signals in germanium detectors provides a powerful tool for a high efficiency selection of neutrinoless double beta decay (0νββ) of ⁷⁶Ge. The standard discrimination techniques are calibrated using samples of 0νββ-like events, which either occur at a different energy or contain a significant background contamination. With the help of a ⁵⁶Co source (which was custom produced by the Jagiellonian University in Krakow), we present a precision measurement of the biases of the standard event selection techniques in 0νββ experiments with ⁷⁶Ge, and propose an additional calibration method. This work has been supported in part by the ERC (Grant agr. No. 786430 - GemX) and by the SFB1258 funded by the DFG.