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T: Fachverband Teilchenphysik

T 66: Neutrino Physics IV

T 66.7: Vortrag

Donnerstag, 19. März 2026, 17:45–18:00, AudiMax

Liquid Handling System and radiopurity of the OSIRIS detector — Manuel Böhles¹, Marcel Büchner¹, Daniela Fetzer¹, Arshak Jafar¹, •Oliver Pilarczyk¹, Tobias Sterr², and Michael Wurm¹ — ¹Johannes Gutenberg-University Mainz — ²Eberhard Karls Universität Tübingen

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator experiment in Jiangmen (China). Its main scientific goal is to determine the neutrino mass ordering by measuring electron antineutrinos from two nearby nuclear power plants at a distance of ~53 km. To achieve this goal the liquid scintillator had to be thoroughly cleaned to make sure it meets the optical and radiopurity requirements.

The 20m* OSIRIS pre-detector is the last device behind these purification plants in an underground hall close to the main JUNO detector. Its task was to monitor the radiopurity of the purified scintillator before it was filled in the JUNO detector. OSIRIS was operated in batch-mode to qualify the purity of scintillator samples and its own experimental sensitivity before and during JUNO filling. To ensure every batch of the scintillator stays about 24h inside OSIRIS a temperature gradient can be established in the detection volume. This talk covers the operations and results from the commissioning phase of the OSIRIS detector as well as the background levels and sensitivity that were reached for U/Th.

The work is supported by the DFG Research Unit 'JUNO' (FOR5519) and the Cluster of Excellence PRISMA+.

Keywords: JUNO; OSIRIS