Observations of neutral-current [Formula presented] 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 [Formula presented] shape, the [Formula presented] component of the [Formula presented] solar flux is [Formula presented] for a kinetic energy threshold of 5 MeV. The non- [Formula presented] component is [Formula presented], [Formula presented] greater than zero, providing strong evidence for solar [Formula presented] flavor transformation. The total flux measured with the NC reaction is [Formula presented], consistent with solar models.

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Persistent URL dx.doi.org/10.1103/PhysRevLett.89.011301
Journal Physical Review Letters
Ahmad, Q.R. (Q. R.), Allen, R.C. (R. C.), Andersen, T.C. (T. C.), D.Anglin, J. (J.), Barton, J.C. (J. C.), Beier, E.W. (E. W.), … Yeh, M. (M.). (2002). Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory. Physical Review Letters, 89(1). doi:10.1103/PhysRevLett.89.011301