Abstract
The rate of neutrino-electron elastic scattering interactions from 862 keV Be7 solar neutrinos in Borexino is determined to be 46.0±1.5(stat)-1.6+1. 5(syst)counts/(day•100ton). This corresponds to a νe- equivalent Be7 solar neutrino flux of (3.10±0.15)×109cm -2s-1 and, under the assumption of νe transition to other active neutrino flavours, yields an electron neutrino survival probability of 0.51±0.07 at 862 keV. The no flavor change hypothesis is ruled out at 5.0σ. A global solar neutrino analysis with free fluxes determines Φpp=6.06-0.06+0.02×1010cm -2s-1 and ΦCNO<1.3×109cm -2s-1 (95% C.L.). These results significantly improve the precision with which the Mikheyev-Smirnov-Wolfenstein large mixing angle neutrino oscillation model is experimentally tested at low energy.
Original language | English (US) |
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Article number | 141302 |
Journal | Physical review letters |
Volume | 107 |
Issue number | 14 |
DOIs | |
State | Published - Sep 30 2011 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy