Heidelberg 2022 – scientific programme
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T: Fachverband Teilchenphysik
T 48: Neutrino Physics without Accelerators 3
T 48.7: Talk
Tuesday, March 22, 2022, 17:45–18:00, T-H33
Final Results of the PoLiDe Experiment — •Ulrike Fahrendholz1, Lothar Oberauer1, Hans Steiger1,2, Raphael Stock1, David Dörflinger1, Mario Schwarz1, and Konstantin Schweizer1 — 1Technische Universität München (TUM), Physik-Department, James-Franck-Str. 1, 85748 Garching bei München — 2Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg-Universität (JGU) Mainz, Staudingerweg 9, 55099 Mainz
The Jiangmen Underground Neutrino Observatory (JUNO) aims to determine the neutrino mass ordering by detecting reactor electron-antineutrinos. In the main detection channel, the inverse beta decay (IBD), a positron is produced, which is used to reconstruct the neutrino*s initial energy. If the positron forms a bound state with spin 1, called ortho-Positronium (o-Ps), with an electron prior to its annihilation, the time structure of the event is distorted due to the longer lifetime of o-Ps. The Positron Lifetime Determination (PoLiDe) experiment was built to determine the lifetime and formation probability of o-Ps in liquid scintillators (LSs). In this talk, the final results of the lifetime measurements for different organic LSs, including the JUNO mixture, and a water-based LS sample are presented.This work is supported by the DFG research unit "JUNO", the DFG collaborative research centre 1258 "NDM", and the DFG Cluster of Excellence "Origins.