Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
Abstract
Observations of neutral-current ν interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using the neutral current (NC), elastic scattering, and charged current reactions and assuming the standard 8B shape, the νe component of the 8B solar flux is φe = 1.76+0.05-0.05(stat)+0.09- 0.09(syst)×106 cm-2 s-1 for a kinetic energy threshold of 5 MeV. The non- νe component is φμτ = 3.41+0.45-0.45(stat)+0.48- 0.45(syst)×106 cm-2 s-1, 5.3σ greater than zero, providing strong evidence for solar νe flavor transformation. The total flux measured with the NC reaction is φNC = 5.09+0.44-0.43(stat)+0.46- 0.43(syst)×106 cm-2 s-1, consistent with solar models.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2002
- DOI:
- arXiv:
- arXiv:nucl-ex/0204008
- Bibcode:
- 2002PhRvL..89a1301A
- Keywords:
-
- Cosmic Rays;
- Deuterons;
- Direct Current;
- Elementary Particle Interactions;
- Flavor (Particle Physics);
- Neutral Currents;
- Neutrinos;
- Nuclear Astrophysics;
- Oscillations;
- Particle Mass;
- Solar Cosmic Rays;
- Solar Neutrinos;
- Solar Physics;
- 98.80.Cq;
- 11.27.+d;
- Particle-theory and field-theory models of the early Universe;
- Extended classical solutions;
- cosmic strings domain walls texture;
- Nuclear Experiment;
- High Energy Physics - Experiment
- E-Print:
- 6 pages, 3 figures, correction to author list and minor typographical corrections to references