Measurement of the Total Active 8B Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity
Abstract
The Sudbury Neutrino Observatory has precisely determined the total active (νx) 8B solar neutrino flux without assumptions about the energy dependence of the νe survival probability. The measurements were made with dissolved NaCl in heavy water to enhance the sensitivity and signature for neutral-current interactions. The flux is found to be 5.21±0.27(stat)±0.38(syst)×106 cm-2 s-1, in agreement with previous measurements and standard solar models. A global analysis of these and other solar and reactor neutrino results yields Δm2=7.1+1.2-0.6×10-5 eV2 and θ=32.5+2.4-2.3 degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2004
- DOI:
- 10.1103/PhysRevLett.92.181301
- arXiv:
- arXiv:nucl-ex/0309004
- Bibcode:
- 2004PhRvL..92r1301A
- Keywords:
-
- 26.65.+t;
- 14.60.Pq;
- 95.85.Ry;
- Solar neutrinos;
- Neutrino mass and mixing;
- Neutrino muon pion and other elementary particles;
- cosmic rays;
- Nuclear Experiment;
- High Energy Physics - Experiment
- E-Print:
- Submitted to Phys. Rev. Lett