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Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory

Q. R. Ahmad et al. (SNO Collaboration)
Phys. Rev. Lett. 89, 011301 – Published 13 June 2002
Physics logo See Focus story: Nobel Prize—Neutrinos Oscillate
An article within the collection: Letters from the Past - A PRL Retrospective
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Abstract

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=1.760.05+0.05(stat)0.09+0.09(syst)×106cm2s1 for a kinetic energy threshold of 5 MeV. The non- νe component is φμτ=3.410.45+0.45(stat)0.45+0.48(syst)×106cm2s1, 5.3σ greater than zero, providing strong evidence for solar νe flavor transformation. The total flux measured with the NC reaction is φNC=5.090.43+0.44(stat)0.43+0.46(syst)×106cm2s1, consistent with solar models.

  • Received 19 April 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.011301

©2002 American Physical Society

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This article appears in the following collection:

Letters from the Past - A PRL Retrospective

2008 marked PRL’s 50th anniversary. As part of the celebrations a collection of milestone Letters was started. The collection contains Letters that have made long-lived contributions to physics, either by announcing significant discoveries, or by initiating new areas of research.

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Nobel Prize—Neutrinos Oscillate

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The 2015 physics Nobel Prize goes to the discoverers of the strange ability of neutrinos to transform among three “flavors.”

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Vol. 89, Iss. 1 — 1 July 2002

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