Solar neutrino with Borexino: results and perspectives

TL;DR

Borexino is a low-background detector that has successfully measured solar neutrino fluxes around 1 MeV, achieving high precision and enabling new research avenues in neutrino physics.

Contribution

This paper reports on Borexino's successful measurement of solar neutrino fluxes and its recent improvements in radiopurity, opening new possibilities for neutrino research.

Findings

Achieved 5% precision in $^{7}$Be solar neutrino flux measurement

Performed successful liquid scintillator re-purification to reduce contaminants

Enabled future measurements of pp, CNO neutrinos and sterile neutrino searches

Abstract

Borexino is a unique detector able to perform measurement of solar neutrinos fluxes in the energy region around 1 MeV or below due to its low level of radioactive background. It was constructed at the LNGS underground laboratory with a goal of solar $^{7}$Be neutrino flux measurement with 5\% precision. The goal has been successfully achieved marking the end of the first stage of the experiment. A number of other important measurements of solar neutrino fluxes have been performed during the first stage. Recently the collaboration conducted successful liquid scintillator repurification campaign aiming to reduce main contaminants in the sub-MeV energy range. With the new levels of radiopurity Borexino can improve existing and challenge a number of new measurements including: improvement of the results on the Solar and terrestrial neutrino fluxes measurements; measurement of pp and CNO solar neutrino fluxes; search for non-standard interactions of neutrino; study of the neutrino oscillations on the short baseline with an artificial neutrino source (search for sterile neutrino) in context of SOX project.