Measurement of day and night neutrino energy spectra at SNO and constraints on neutrino mixing parameters.
2002
The
Sudbury Neutrino Observatory(SNO) has measured
dayand
night
solar neutrinoenergy spectra and rates. For
charged currentevents, assuming an undistorted 8 B 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
neutrinosis additionally constrained to have no asymmetry, the v e asymmetry is found to be 7.0% ′ 4.9% + 1 . 3 - 1 . 2 %. A global
solar neutrinoanalysis in terms of matter-enhanced oscillations of two active flavors strongly favors the large mixing angle solution.
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