Speaker
Description
Solar neutrinos are unique probes for studying the Sun. The Borexino experiment uses organic liquid scintillator as detection material. Thanks to the reached unprecedented levels of radio-purity, Borexino measured neutrinos from the pp chain and CNO cycle. Currently, the recent solar model predictions prefer low metal abundances which are, however, in tension with helioseismology data preferring the older solar model predictions with higher metal abundances. This is known as the solar metallicity problem. The measurements of solar neutrino fluxes by Borexino can be used to test the Standard Solar Model predictions. Among the measurements, those of CNO neutrinos are of particular interest. The CNO neutrino flux depends directly on the carbon and nitrogen abundances, and, thus can be used to probe the metallicity of the Sun directly. In this talk, I will review the measurements of pp-chain and CNO-cycle solar neutrinos by Borexino, and discuss their implications on solar physics.
