Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 15: Neutrino astronomy 1
T 15.1: Vortrag
Montag, 4. März 2024, 16:00–16:15, Geb. 30.23: 6/1
Directional solar neutrino analysis in JUNO — •Marco Malabarba2,3,1, Livia Ludhova1,3, Yury Malyshkin2,1, Cristobal Morales Reveco2,3,1, Mariam Rifai1,3, Luca Pelicci1,3, Hexi Shi2,1, and Apeksha Singhal1,3 — 1Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — 3III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
JUNO (Jiangmen Underground Neutrino Observatory) is a multipurpose neutrino physics experiment currently under construction in China. Its target consists of 20 kton of organic liquid scintillator. The optical photons are collected by photomultiplier tubes (PMTs) which provide a geometrical coverage of 78%. Thanks to its unprecedented features, JUNO is a perfect candidate to study solar neutrinos. Solar neutrinos mainly interact through elastic scattering reactions with liquid scintillator electrons. Hence, all the beta-like decays of unstable nuclei are backgrounds. The Correlated and Integrated Directionality (CID) analysis, developed by Borexino, can be exploited to statistically separate signal and background events. CID relies on the directionality of the fast Cherenkov light: the PMT hits caused by Cherenkov photons exhibit a correlation with the Sun's position only for solar neutrino events. Our studies show that, in JUNO, the combination of the CID and the spectral analyses (which exploits the different energy spectral shapes of signals and backgrounds) could yield the most precise measurement of 7Be and CNO solar neutrinos ever achieved.
Keywords: JUNO; solar neutrinos; Cherenkov; Borexino; PMT