SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 91: Neutrinos IV
T 91.4: Vortrag
Mittwoch, 22. März 2023, 18:15–18:30, POT/0006
OSIRIS Upgrade: Solar PP Neutrinos and Neutrinoless Double Beta Decay — •Arshak Jafar1, Kai Loo1,2, Michael Wurm1, Marcel Büchner1, Tim Charisse1, George Parker1, Oliver Pilarczyk1, and Timo Enqvist2 — 1Johannes Gutenberg University Mainz, Germany — 2University of Jyvaskyla, Finland
The Jiangmen Underground Neutrino Observatory (JUNO), under construction in southern China, will determine the neutrino mass hierarchy (MH) by observing neutrinos from nuclear reactors at a distance of 53 km. To reach the desired sensitivity (> 3σ) for MH, the radiopurity of the different detector components plays a crucial role. To ensure the purity of the 20 kt liquid scintillator (LS) target of JUNO, the Online Scintillator Internal Radioactivity Investigation System (OSIRIS) is being constructed. It will monitor the radiopurity of the LS during its production and the filling phase of the central detector of JUNO.
After the filling phase, a plan to repurpose OSIRIS as a standalone detector for studying physics has been put forward, as OSIRIS along with the existing JUNO infrastructure provides a unique chance for low-budget high precision measurements. The OSIRIS upgrade project aims at a precision measurement of the flux of solar pp neutrinos on the few-percent level as well as to test the Majorana nature of neutrinos through neutrinoless double beta decay. The upgrade relies on the use of 20 tons of slow scintillator, either low 14C or loaded with 0νββ isotope, with excellent energy resolution (∼2.5% at 1 MeV), low internal background and sufficient shielding from surrounding radioactivity.