Heidelberg 2022 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 8: Astroparticles: Invited talks (joint session T/EP)

EP 8.1: Hauptvortrag

Donnerstag, 24. März 2022, 11:00–11:30, T-H15

Borexino looks in the direction of solar neutrinos — •Livia Ludhova for the Borexino collaboration — Forschungszentrum Jülich, Jülich, Germany — RWTH Aachen University, Aachen, Germany

Borexino is a 280-ton liquid scintillator detector located at the LNGS in Italy. Characterized by an unprecedented radio-purity, it has succeeded in providing several milestone measurements of MeV-scale neutrinos, with the main focus on solar neutrinos. The latter are the only direct probe of the Hydrogen-to-Helium fusion powering our Sun. The European Physical Society awarded the 2021 Giuseppe and Vanna Cocconi Prize to the Borexino Collaboration for the ground-breaking observation of solar neutrinos from the pp chain and CNO cycle that provided unique and comprehensive tests of the Sun as a nuclear fusion engine. Borexino has developed a new method, Correlated and Integrated Directionality (CID), to exploit the sub-dominant directional Cherenkov light in a liquid scintillator detector. This technique can disentangle the solar neutrino signal, correlated with the known position of the Sun, from the isotropic background. In the region of interest dominated by the signal from 0.862 MeV Be-7 solar neutrinos, the no-solar neutrino hypothesis has been excluded with >5σ C.L. This novel method is readily applicable to next generation experiments. The talk will focus on the recent Borexino solar neutrino results, including the motivation, analysis details, as well as their interpretation.