Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 47: Experimental techniques in astroparticle physics II

T 47.10: Talk

Tuesday, March 16, 2021, 18:15–18:30, Tv

Radon Monitoring in gaseous Nitrogen used for the Filling of the Central Detector of JUNO and OSIRIS — •Hans Steiger^{1, 2}, Lothar Oberauer¹, Matthias Raphael Stock¹, and Philipp Landgraf¹ — ¹Physik-Department, Technische Universität München (TUM), James-Franck-Straße 1, 85748 Garching bei München — ²Cluster of Excellence PRISMA+, Johannes Gutenberg University Mainz (JGU), Staudingerweg 9, D-55128 Mainz

The planned JUNO (Jiangmen Underground Neutrino Observatory) Detector will use 20 kt of liquid scintillator (LS) based on LAB (Linear AlkylBenzene) as neutrino target within an acrylic sphere with a diameter of 35.4 m. For the filling of this sphere as well as for the filling of OSIRIS (Online Scintillator Internal Radioactivity Investigation System) with LS pressurized nitrogen will be used. To avoid a contamination of the LS with ²²²Rn, its content in the nitrogen gas will be monitored. In this talk the status of a prototype radon monitoring system based on a large volume (50 l) proportional chamber operated in pure nitrogen will be presented as well as pulse shape analysis techniques applied for efficient background reduction. This work is supported by the DFG research unit "JUNO" (FOR2319) and the Maier-Leibnitz-Laboratorium (MLL).