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Solar neutrinos from the decay of $^8$B have been detected at the SudburyNeutrino Observatory (SNO) via the charged current (CC) reaction on deuteriumand by the elastic scattering (ES) of electrons. The CC reaction is sensitiveexclusively to nu_e's, while the ES reaction also has a small sensitivity tonu_mu's and nu_tau's. The flux of nu_e's from ^8B decay measured by the CCreaction rate is  \phi^CC(nu_e) = 1.75 +/- 0.07 (stat)+0.12/-0.11 (sys.) +/- 0.05(theor) x 10^6/cm^2 s.  Assuming no flavor transformation, the flux inferred from the ES reactionrate is  \phi^ES(nu_x) = 2.39+/-0.34 (stat.)+0.16}/-0.14 (sys) x 10^6 /cm^2 s.  Comparison of \phi^CC(nu_e) to the Super-Kamiokande Collaboration's precisionvalue of \phi^ES(\nu_x) yields a 3.3 sigma difference, providing evidence thatthere is a non-electron flavor active neutrino component in the solar flux. Thetotal flux of active ^8B neutrinos is thus determined to be 5.44 +/-0.99 x10^6/cm^2 s, in close agreement with the predictions of solar models.Comment: 6 pages (LaTex), 3 figures, submitted to Phys. Rev. Letter

physical review letters

Measurement of the Rate of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mi>e</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi /><mml:mo>+</mml:mo><mml:mi /><mml:mi mathvariant="italic">d</mml:mi><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mi mathvariant="italic">p</mml:mi><mml:mi /><mml:mo>+</mml:mo><mml:mi /><mml:mi mathvariant="italic">p</mml:mi><mml:mi /><mml:mo>+</mml:mo><mml:mi /><mml:mrow…

Measurement of the Rate ofνe+d→p+p+