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 · 182 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 νe 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.
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