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Phys. Rev. Lett. 89, 011301 (2002) [6 pages]

Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
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Q. R. Ahmad et al.
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Received 19 April 2002; published 13 June 2002

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 8B shape, the νe component of the 8B solar flux is φe  =  1.76-0.05+0.05(stat)-0.09+0.09(syst)×106  cm-2 s-1 for a kinetic energy threshold of 5 MeV. The non- νe component is φμτ  =  3.41-0.45+0.45(stat)-0.45+0.48(syst)×106  cm-2 s-1, 5.3σ greater than zero, providing strong evidence for solar νe flavor transformation. The total flux measured with the NC reaction is φNC  =  5.09-0.43+0.44(stat)-0.43+0.46(syst)×106  cm-2 s-1, consistent with solar models.


©2002 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v89/e011301
DOI: 10.1103/PhysRevLett.89.011301
PACS: 26.65.+t, 14.60.Pq, 95.85.Ry

* Permanent address: Birkbeck College, University of London, Malet Road, London WC1E 7HX, UK.
† Deceased.

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