Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 69: Neutrino physics without accelerators VI

T 69.9: Talk

Wednesday, March 17, 2021, 18:05–18:20, Ts

Development of the muon veto system for the OSIRIS pre-detector of JUNO — •Axel Müller, Lukas Bieger, David Blum, Marc Breisch, Jessica Eck, Tobias Heinz, Benedict Kaiser, Frieder Kohler, Tobias Lachenmaier, Tobias Sterr, Alexander Tietzsch, and Jan Züfle — Eberhard Karls Universität Tübingen

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kton liquid scintillator next-generation neutrino detector currently under construction in southern China. Besides the main goal of determining the neutrino mass ordering, a broad range of neutrino sources will be investigated. For the monitoring of the liquid scintillator contamination levels during the filling process, the OSIRIS pre-detector is being designed, a 20-ton liquid scintillator detector installed in the scintillator filling line. Secondary neutrons and isotopes from cosmic muons are a severe background source, which affect the OSIRIS sensitivity limits. To reject this background source a Cherenkov muon veto was developed, for which the water volume around the target volume will be instrumented with additional PMTs. Their arrangement and the optical properties of the detector surfaces were optimized based on simulations to maximize the detection of Cherenkov photons from muons and thus increasing the muon detection efficiency. In this talk the requirements on the muon veto sensitivity, the design of the veto system and its expected performance will be reported. This work is supported by the Deutsche Forschungsgemeinschaft.