Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory

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13 June 2002

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 89 (1) , 011301
https://doi.org/10.1103/physrevlett.89.011301

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

^{8} B

shape, the

ν_{e}

component of the

^{8} B

solar flux is

φ_{e} {= 1.76}_{- 0.05}^{+ 0.05} (stat)_{- 0.09}^{+ 0.09} (syst) \times 10^{6} {cm}^{- 2} s^{- 1}

for a kinetic energy threshold of 5 MeV. The non-

ν_{e}

component is

φ_{μ τ} {= 3.41}_{- 0.45}^{+ 0.45} (stat)_{- 0.45}^{+ 0.48} (syst) \times 10^{6} {cm}^{- 2} s^{- 1}

5.3 σ

greater than zero, providing strong evidence for solar

ν_{e}

flavor transformation. The total flux measured with the NC reaction is

φ_{NC} {= 5.09}_{- 0.43}^{+ 0.44} (stat)_{- 0.43}^{+ 0.46} (syst) \times 10^{6} {cm}^{- 2} s^{- 1}

, consistent with solar models.

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