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

Preprint

9 June 2008

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.0805.3843

Abstract

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.

Keywords

All Related Versions

Version 1, 2008-05-25, ArXiv
Version 2, 2008-06-09, ArXiv
Published version: Physical Review Letters, 101 (9), 091302.

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