Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-04-19
Phys.Rev.Lett.89:011302,2002
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 4 figures; very minor revisions, accepted by Physical Review Letters
Scientific paper
10.1103/PhysRevLett.89.011302
The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted $^8$B spectrum, the night minus day rate is $14.0% \pm 6.3% ^{+1.5}_{-1.4}%$ of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the $\nu_e$ asymmetry is found to be $7.0% \pm 4.9% ^{+1.3}_{-1.2}%$. 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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