  Observations of neutral current neutrino interactions on deuterium in the
Sudbury Neutrino Observatory are reported. Using the neutral current, elastic
scattering, and charged current reactions and assuming the standard 8B shape,
the electron-neutrino component of the 8B solar flux is 1.76
+/-0.05(stat.)+/-0.09(syst.) x10^6/(cm^2 s), for a kinetic energy threshold of
5 MeV. The non-electron neutrino component is
3.41+/-0.45(stat.)+0.48,-0.45(syst.) x10^6/(cm^2 s), 5.3 standard deviations
greater than zero, providing strong evidence for solar electron neutrino flavor
transformation. The total flux measured with the NC reaction is 5.09
+0.44,-0.43(stat.)+0.46,-0.43(syst.)x10^6/(cm^2 s), consistent with solar
models.
