Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 15: Neutrino astronomy 1

T 15.4: Vortrag

Montag, 4. März 2024, 16:45–17:00, Geb. 30.23: 6/1

Detection of solar pp neutrinos with the OSIRIS upgrade — •Tim Charissé, Marcel Büchner, Arshak Jafar, George Parker, Oliver Pilarczyk, and Michael Wurm — Johannes Gutenberg-University Mainz, Institute of Physics and EC PRISMA+

The OSIRIS detector will monitor the radiopurity of the scintillator during the filling of JUNO. After it has fulfilled this purpose, it can be upgraded for the measurement of solar pp neutrinos on its own. Here, the comparatively small size of its scintillator volume poses an advantage, as it enables the use of a liquid scintillator with an ultra-low abundance of ¹⁴C, the main background source in the pp neutrino energy region. Further upgrades include additional shielding, the use of a slow scintillator, additional PMTs and the installation of reflective light cones, which will result in an excellent photo electron yield. This talk will present the results of recent sensitivity studies on the feasibility of measuring pp neutrinos with the OSIRIS upgrade through a spectral fit and the analysis method called Correlated and Integrated Directionality. The latter makes use of the directional information of the Cherenkov light over a cumulative approach. The spectral fit is expected to yield a measurement of the pp neutrino rate with a sensitivity on the 3.5% level within 5 years, significantly better than the current best experimental measurements. This work is supported by the DFG Research Unit FOR 5519.

Keywords: pp neutrinos; solar neutrinos; OSIRIS