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T: Fachverband Teilchenphysik
T 17: Methods of astroparticle physics I
T 17.6: Vortrag
Montag, 30. März 2020, 17:45–18:00, H-HS XVII
Determination of scintillation parameters of the mDOM glass pressure vessel for background simulations — •Markus Dittmer, Martin Unland, Lew Classen, and Alexander Kappes for the IceCube collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster
The IceCube neutrino observatory is the world’s largest neutrino telescope instrumenting 1 km3 of Antarctic glacial ice. When charged particles traverse the transparent detector medium, Cherenkov light is produced which is detected by optical modules consisting of PMTs housed in glass pressure vessels. The investigated Vitrovex glass vessels will be used for the mDOM within the IceCube Upgrade. The glass contains trace amounts of radioactive isotopes, such as 40K. The respective decays cause background signals by scintillation and Cherenkov photons. Since the optical activity of the deep glacier ice is very low, the light produced by the modules themselves represents the dominant background source. In order to fully characterize the background expected for mDOMs and its influence on the signal processing of real events, scintillation parameters have to be investigated thoroughly. This contribution presents results from measurements and Geant4 simulations of the scintillation yield for γ and α-particles.