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T: Fachverband Teilchenphysik

T 14: Detectors 3 (muon detectors)

T 14.6: Talk

Monday, March 4, 2024, 17:15–17:30, Geb. 30.23: 3/1

Study of cosmogenic backgrounds in the JUNO pre-detector OSIRIS — •Marcel Büchner, Arshak Jafar, George Parker, Michael Wurm, Oliver Pilarczyk, and Tim Charisse — Johannes Gutenberg-University Mainz, Institute of Physics and EC PRISMA+

OSIRIS as the pre-detector of the JUNO reactor neutrino measurement, is meant to monitor the radio-purity of the scintillator used. The monitoring of the scintillators radio-purity relies on an in- situ measurement of radioactive decays in the 20-ton scintillator volume. Therefore, the scintillator volume is surrounded by 500 tons of water for external shielding and all detector materials have been carefully selected for radiopurity. To ensure that the background is as low as possible, OSIRIS is located approximately 700m under- ground. Even at that depth, a relevant level of background events originates from cosmic muons, which not only cause a signal themselves but they can interact with the detector material and cause the creation of radioactive isotopes. This talk presents the ongoing work of the implementation of a muon veto for OSIRIS. Utilizing an array of 12 PMTs mounted in the OSIRIS water tank but also the distinctive timing signal of muon tracks. Based on the tagging of these muons and using spatial and temporal correlations, cosmogenic neutrons and radioactive isotopes (e.g. C-11) can be identified. This Project is funded by the DFG Research Unit FOR 5519.

Keywords: Cosmic Muons; Cosmogenics; JUNO