München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Astroparticle Physics II

HK 29.3: Vortrag

Dienstag, 19. März 2019, 17:15–17:30, HS 18

Signal modeling in inverted coaxial HPGe detectors for Legend — •Tommaso Comellato, Matteo Agostini, and Stefan Schönert — Physik-Department, Technische Universität München, Garching, Germany

The Legend collaboration plans to operate in its first stage up to 200 kg of enriched High Purity Germanium (HPGe) detectors in the upgraded Gerda infrastructure at LNGS, Italy. The science goal is to search for the neutrinoless double beta decay of ⁷⁶Ge. In the current Gerda and Majorana Demonstrator experiments, enriched HPGe detectors with excellent pulse shape discrimination (PSD) properties are operated. Their masses are however typically below one kilogram. To reduce backgrounds from close-by parts as cables and holders, larger mass detectors without compromising the PSD performance are required. A novel detector geometry, referred to as inverted coaxial, is the baseline design of Legend HPGe detectors. A custom designed inverted coaxial detector with 1.6 kg mass was produced in collaboration with Baltic Scientific Instruments and the Helmholtz Research Center Rossendorf, and has been comprehensively characterized at TUM. In this talk I will present the latest results about the performance of this detector including the charge collection, signal shape properties and pulse shape discrimination performance. This work has been supported in part by the German Federal Ministry for Education and Research (BMBF) Verbundforschung 05A17W02 and the German Research Foundation (DFG) via the SFB1258.