Precision Measurement of the Be7 Solar Neutrino Interaction Rate in Borexino
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 2011
- DOI:
- arXiv:
- arXiv:1104.1816
- Bibcode:
- 2011PhRvL.107n1302B
- Keywords:
-
- 26.65.+t;
- 13.35.Hb;
- 14.60.Pq;
- 95.55.Vj;
- Solar neutrinos;
- Decays of heavy neutrinos;
- Neutrino mass and mixing;
- Neutrino muon pion and other elementary particle detectors;
- cosmic ray detectors;
- High Energy Physics - Experiment;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Accepted for publication on Physics Review Letters