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T: Fachverband Teilchenphysik

T 69: Neutrino physics without accelerators VI

T 69.5: Vortrag

Mittwoch, 17. März 2021, 17:05–17:20, Ts

Development and operation of the OSIRIS prototype — •Oliver Pilarczyk, Wilfried Depnering, Heike Enzmann, Paul Hackspacher, Artur Meinusch, Kai Loo, Hans Steiger, Eric Theisen, and Michael Wurm — Institut für Physik, JGU Mainz

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator experiment currently under construction in Jiangmen (China). Its main scientific goal is to determine the neutrino mass ordering by measuring antielectron neutrinos from two nearby nuclear power plants at a distance of ~53 km. To achieve this goal the liquid scintillator has to go through several purification plants on site to make sure it meets the optical and radiopurity requirements.

The 20m* OSIRIS pre-detector is the last device behind these purification plants. Its task is to monitor the radiopurity of the purified scintillator before it is filled in the JUNO detector. OSIRIS is expected to be operated in a continuous mode, which means that the scintillator will be filled from the top and drained from the bottom into the main JUNO detector. To make sure every batch of the scintillator stays about 24 h inside the OSIRIS detector a temperature gradient will be established in the detection volume to help stratification of the liquid scintillator inside. This talk presents the prototype of the OSIRIS detector as developed and operated in Mainz as well as the results from the experiment. Furthermore a study on the sensitivity of the OSIRIS detector to U/Th contamination levels of the scintillator will be shown. The development is funded by the DFG Research Unit 'JUNO' (FOR2319) and the Cluster of Excellence PRISMA+.