Abstract
The Borexino experiment is running at the Laboratori del Gran Sasso in Italy since 2007. Its technical distinctive feature is the unprecedented ultralow background of the inner scintillating core, which is the basis of the outstanding achievements accumulated by the experiment. In this talk, after recalling the main features of the detector, the impressive solar data gathered so far by the experiment will be summarized, with special emphasis to the most recent and prominent result concerning the detection of the fundamental pp solar neutrino flux, which is the direct probe of the engine mechanism powering our star. Such a milestone measurement puts Borexino in the unique situation of being the only experiment able to do solar neutrino spectroscopy over the entire solar spectrum; the counterpart of this peculiar status in the oscillation interpretation of the data is the capability of Borexino alone to perform the full validation across the solar energy range of the MSW-LMA paradigm. The talk will be concluded highlighting the perspectives for the final stage of the solar program of the experiment, centered on the goal to fully complete the solar spectroscopy with the missing piece of the CNO neutrinos. If successful, such a measurement would represent the final crowning of the long quest of Borexino to unravel all the properties of the neutrinos from the Sun.
Highlights
Borexino at Gran Sasso is the last player which entered the solar neutrino arena, where thanks to its unprecedented low background it provided breakthrough results in the low energy sub-MeV regime
MSW-LMA global picture In figure 2 the MSW predicted Pee is shown, together with several experimental points, all coming from Borexino: i.e. black the 8B from the analyses with two different thresholds, light blue the pep, blue the 7Be, red the very recent pp datum
We demonstrate the unique achievement of Borexino, which through an almost complete solar spectroscopy has been in condition, alone, to confirms spectacularly the MSW-LMA solar neutrino oscillation scenario, while providing the first direct measurements of the survival probability in the low energy sub-MeV Vacuum MSW regime
Summary
Borexino at Gran Sasso is the last player which entered the solar neutrino arena, where thanks to its unprecedented low background it provided breakthrough results in the low energy sub-MeV regime. Having already measured three components of the solar neutrino spectrum over the past years, i.e. 7Be, 8B and pep (providing jointly with this component a stringent upper limit on the CNO contribution), Borexino has recently crowned its remarkable series of results with the detection of the fundamental pp neutrino flux, coming from the reaction which provides most of the Sun’s energy. The last step of this investigation will be the attempt to measure the tiny CNO flux, which Borexino will undertake over the years. Borexino has detected an unquestionable geoneutrino signal (i.e. anti-neutrinos from the radioactivity inside the Earth), contributing to pave the way to a complete new method to investigate the interior of our planet. In the following the experimental characteristics which made possible these outstanding accomplishments will be briefly reviewed, together with the features of the results achieved so far
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