Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 94: Neutrino physics without accelerators VII
T 94.10: Vortrag
Donnerstag, 18. März 2021, 18:20–18:35, Ts
Upgrade of the PoLiDe-setup for ortho-positronium lifetime and formation probability measurements in liquid scintillators — •Ulrike Fahrendholz1, Lothar Oberauer1, Hans Theodor Josef Steiger1,2, Matthias Raphael Stock1, Oliver Dötterl1, Mario Schwarz1, Konstantin Schweizer1, David Dörflinger1, and Ludwig Wallner1 — 1Physik-Department, Technische Universität München (TUM), James-Franck-Str. 1, 85748 Garching bei München — 2Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität (JGU) Mainz, Staudingerweg 9, 55099 Mainz
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator (LS) multi-purpose neutrino detector built in a dedicated underground laboratory in Jiangmen (China). The main detection channel for determination of the neutrino mass ordering is the Inverse Beta Decay (IBD), where a neutron and a positron are produced. The positron*s direction and energy are resolved by measuring its scintillation light followed by the two 511 keV gammas resulting from the annihilation with an electron. Formation ortho-positronium delays the annihilation signal, leading to an overall distorted pulse shape in the detector. For better understanding of this process, the existing setup for Positronium Lifetime Determination (PoLiDe) has been upgraded to achieve more accurate values for the lifetime and formation probability of ortho-positronium in the LS. This work is supported by the DFG Research Unit *JUNO* (FOR2319) and the Maier-Leibnitz-Laboratorium (MLL).