Abstract
The Borexino experiment, located in the Laboratori Nazionali del Gran Sasso in Italy and widely known for its rich Solar Neutrino physics program, has recently celebrated the 10 years of data taking. Among the achievements of the Borexino experiment solar program are: a precision measurement of 7Be neutrino flux with uncertainty of 3%, limit on its day/night asymmetry, first spectral measurement of pp-neutrinos, first evidence of monoenergetic pep neutrinos at 5 sigma, 8B neutrinos detection with the lowest visible energy threshold of 3 MeV, observation of season modulation of the 7Be solar neutrino rate at 3.8 sigma and the best current limit on CNO neutrino flux.Borexino is now in its high-purity Phase II data taking, thanks to intense purification campaigns of scintillator in 2010-11 that were very successful in further reducing the already low backgrounds. The advanced tecniques of data analysis were improved, allowing to maximize the signal/noise ratio. The detector was thermally insulated in order to improve the fluid stability. As an outcome, quality of the data has significantly increased leading to new levels of sensitivity to all solar neutrino fluxes. This allows a more sensitive probe for CNO neutrinos relevant to the solar metallicity problem.
Highlights
Quality of the data has significantly increased leading to new levels of sensitivity to all solar neutrino fluxes
The study of neutrinos emitted by the Sun with energies below 3 MeV is a science at the intersection of elementary particle physics
Borexino is the only experiment which performed the direct detection of the four main solar neutrino fluxes from the chain, thereby providing a clear evidence of the transition of the pp electron neutrino survival probability from vacuum to matter-dominated oscillations in the framework of the MSW-LMA solution
Summary
The spectrum of electron neutrinos (⌫e) generated in the core of the Sun is shown in Fig.1, resulting both from the reactions of the chain and the CNO cycle. Borexino is the only experiment which performed the direct detection of the four main solar neutrino fluxes from the chain, thereby providing a clear evidence of the transition of the pp electron neutrino survival probability from vacuum to matter-dominated oscillations in the framework of the MSW-LMA solution.
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