New results on solar neutrino fluxes from 192 days of Borexino data

Details New results on solar neutrino fluxes from 192 days of Borexino data New results on solar neutrino fluxes from 192 days of Borexino data

2008-05-25

arxiv.org/abs/0805.3843v2

Phys.Rev.Lett.101:091302,2008

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1103/PhysRevLett.101.091302

We report the direct measurement of the ^7Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV ^7Be neutrinos is 49+-3(stat)+-4(syst) counts/(day * 100ton). The hypothesis of no oscillation for ^7Be solar neutrinos is inconsistent with our measurement at the 4sigma level. Our result is the first direct measurement of the survival probability for solar nu_e in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of ^7Be, pp, and CNO solar nu_e, and the limit on the magnetic moment of neutrinos.

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