SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 89: DM, Neutrino Theory
T 89.2: Vortrag
Mittwoch, 22. März 2023, 17:45–18:00, POT/0251
Background characterisation of GeMPI detectors and shield design for improved GeMPI-neo detectors — •Nicola Ackermann1, Matthias sLaubenstein2, Jochen Schreiner1, Christian Buck1, Manfred Lindner1, Gerd Heusser1, Herbert Strecker1, Werner Maneschg1, Janina Hakenmüller1, and Hannes Bonet1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Laboratori Nazionali del Gran Sasso, L'Aquila, Italy
This talk presents Monte Carlo simulations of the background spectra of the 4 screening detectors GeMPI 1 - 4 at the Gran Sasso Underground Laboratory (LNGS) using the Geant4 based framework MaGe. The GeMPI detectors are low background Ge spectrometers located at a depth of 3500 m.w.e. and achieve extremely high sensitivites in material screening at a level of muBq/kg. They are used to test material samples on their suitability to use in rare event experiments.
In the simulations muons, neutrons and tiny radioactive contaminations of the detector and shielding materials are investigated as possible sources of background radiation. It was found that the Pb210 contaminations in the detector shield and the neutrons coming from radioactive decays in the surrounding rock have the highest impact on the background spectra. With this new found understanding, a possible shield design for a next generation GeMPI-like detector is proposed.