Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters

2002/04/30 by SNO Collaboration, Rushdy Ahmad, R. C. Allen +98 · 82 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #astro-ph #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevlett.89.011302

published as Phys.Rev.Lett.89:011302,2002 · 5 pages, 4 figures; very minor revisions, accepted by Physical Review Letters

arxiv created 2002/05/14 · openalex publication_date 2002/06/13 · arxiv updated 2012/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted ⁸B spectrum, the night minus day rate is 14.0% ± 6.3% ^+1.5_-1.4% of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the ν_e asymmetry is found to be 7.0% ± 4.9% ^+1.3_-1.2%. A global solar neutrino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution.

Citations

• Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory

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