Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 23: Experimental Techniques in Astroparticle Physics 1
T 23.1: Vortrag
Montag, 21. März 2022, 16:15–16:30, T-H36
Monte Carlo simulation of background components in low level Germanium spectrometry — •Nicola Ackermann1, Hannes Bonet1, Christian Buck1, Janina Hakenmüller1, Gerd Heusser1, Matthias Laubenstein2, Manfred Lindner1, Werner Maneschg1, Jochen Schreiner1, and Herbert Strecker1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Laboratori Nazionali del Gran Sasso, Via G. Acitelli 22, 67100 Assergi 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 µBq/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 and it was found that the 210Pb contaminations in the detector shield and the neutrons coming from radioactive decays in the surrounding rock are the biggest contributors. A detailed understanding of the composition of the background spectra was achieved, allowing for the suggestion of two new possible shield designs for future GeMPI-like detectors