Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 81: Neutrinophysik 7 (Doppelbetazerfall, sterile Neutrinos)
T 81.2: Vortrag
Mittwoch, 29. März 2017, 17:05–17:20, VSH 118
Monte Carlo Geometry of Gerda Phase II — •Janina Hakenmüller for the GERDA collaboration — Max-Planck-Institut für Kernphysik (MPIK), Saupfercheckweg 1, 69117 Heidelberg, Germany
The Gerda experiment is looking for neutrinoless double beta decay in Germanium. Gerda Phase II consists of 40 germanium diodes enriched in 76Ge and operated in liquid argon. The setup is equipped with a liquid argon veto, meaning a light instrumentation registers energy depositions of background sources in liquid argon.
The geometry of the Gerda setup is implemented into a Monte Carlo (MC) simulation in MaGe, based on Geant4. It is used e.g. to simulate spectra of possible contaminations for the background model. For Gerda Phase II analysis this geometry has been updated to the current 7 string setup and will be shown in the talk. To check the accuracy of this implementation, a weekly calibration run with 3 228Th sources has been simulated. After a necessary optimization of the source positions a good agreement between MC and data was found for the integral count rate as well as the spectral shape.
Moreover, in the MC output of the simulations of the background contributions also the energy depositions in liquid argon are registered. By doing a cut on these energy depositions it can be tried to approximate the effect of the veto suppression in the MC. This comparison as well as the MC to data comparison of the 228Th calibration will be presented in the talk.