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

2002/04/30 by Rushdy Ahmad, R. C. Allen, Thomas Andersen +97 · 64 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies

paper · pdf · doi:10.1103/physrevlett.89.011301

openalex publication_date 2002/06/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04

Abstract

Observations of neutral-current \ensuremathν 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 \ensuremathν_e component of the ⁸B solar flux is \ensuremathφ_e\phantom\rule0ex0ex=\phantom\rule0ex0ex1.76_\ensuremath-0.05^+0.05(stat)_\ensuremath-0.09^+0.09(syst)\ifmmode×\else\texttimes\fi10⁶\phantom\rule0ex0excm^\ensuremath-2s^\ensuremath-1 for a kinetic energy threshold of 5 MeV. The non- \ensuremathν_e component is \ensuremathφ_\ensuremathμ\ensuremathτ\phantom\rule0ex0ex=\phantom\rule0ex0ex3.41_\ensuremath-0.45^+0.45(stat)_\ensuremath-0.45^+0.48(syst)\ifmmode×\else\texttimes\fi10⁶\phantom\rule0ex0excm^\ensuremath-2s^\ensuremath-1, 5.3\ensuremathσ greater than zero, providing strong evidence for solar \ensuremathν_e flavor transformation. The total flux measured with the NC reaction is \ensuremathφ_NC\phantom\rule0ex0ex=\phantom\rule0ex0ex5.09_\ensuremath-0.43^+0.44(stat)_\ensuremath-0.43^+0.46(syst)\ifmmode×\else\texttimes\fi10⁶\phantom\rule0ex0excm^\ensuremath-2s^\ensuremath-1, consistent with solar models.

Citations

• Measurement of the Rate ofνe+d→p+p+e−Interactions Produced byB<mml:mprescripts/>8Solar Neutrinos at the Sudbury Neutrino Observatory
• The Sudbury Neutrino Observatory

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