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

Direct measurement of the Be-7 solar neutrino flux with 192 days of Borexino data

DE BARI, ANTONIO;
2008-01-01

Abstract

We report the direct measurement of the 7 Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV Be-7 neutrinos is 49 +/- 3(stat) +/- 4(syst) counts/(day . 100 ton). The hypothesis of no oscillation for Be-7 solar neutrinos is inconsistent with our measurement at the 4 sigma C.L. Our result is the first direct measurement of the survival probability for solar P, in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of Be-7, pp, and CNO solar v(e) and the limit on the effective neutrino magnetic moment using solar neutrinos.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/141997
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