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Type: Artigo de periódico
Title: Solar neutrinos: the SNO salt phase results and physics of conversion
Author: De Holanda, PC
Smirnov, AY
Abstract: We have performed analysis of the solar neutrino data including results from the SNO salt phase as well as the combined analysis of the solar and the KamLAND results. The best-fit values of neutrino parameters are Deltam(2) = 7.1 x 10(-5) eV(2), tan(2)theta = 0.40 with the boron flux f(B) = 1.04. New SNO results strongly disfavor maximal mixing and the h-LMA region (Deltam(2) > 10(-4) eV(2)) which is accepted now at the 36 level. We find the 3(7 upper bounds: Deltam(2) < 1.7 x 10(-4) eV(2) and tan(2)theta < 0.64, and the lower bound Deltam(2) > 4.8 x 10(-5) eV(-1). Non-zero 13-mixing does not change these results significantly. The present data determine quantitatively the physical picture of the solar neutrino conversion. At high energies relevant for SNO and Super-Kamiokande the deviation of the effective survival probability from the nonoscillatory value is about 10-14%. The oscillation effect contribution to this difference is about 10'% and the earth regeneration about 3-4%. At low energies (E < 1 MeV) the matter corrections to vacuum oscillation effect are below 5%. The predictions for the forthcoming measurements are given which include the spectral distortion and CC/NC ratio at SNO, the day night asymmetry, the KamLAND spectrum and rate. (C) 2004 Elsevier B.V. All rights reserved.
Subject: solar neutrinos
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.astropartphys.2004.01.007
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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