The Sudbury Neutrino Observatory (SNO) is a 1000 tonne heavy water Cherenkov detector placed 2 km underground in Ontario, Canada. Its main purpose is the detection of solar neutrinos, but it is also sensitive to atmospheric and supernova neutrinos. In this paper we report our first measurement of the solar electron-type neutrino flux using the charged current interaction on deuterium, above an electron kinetic energy threshold of 6.75 MeV. This measurement, when compared with an electron scattering measurement from Super Kamiokande, provides the first evidence for non-electron neutrino types from the Sun implying flavor change of solar electron neutrinos. We also present an initial angular distribution of through-going muons, which shows that we can detect neutrino-induced muons from well above the horizontal. This will give us good sensitivity to neutrino oscillations in the atmospheric sector.

2001 International Europhysics Conference on High Energy Physics, HEP 2001
Department of Physics

McDonald, A. (Art), Boger, J. (J.), Hahn, R.L. (R. L.), Rowley, J.K. (J. K.), Yeh, M. (M.), Blevis, I. (I.), … Wilkerson, J.F. (J. F.). (2001). Measurement of CC interactions produced by8B solar neutrinos at SNO. In Proceedings of Science.