Journal
PHYSICAL REVIEW C
Volume 65, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.65.015802
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The minimal standard electroweak model can be tested by allowing all the solar neutrino fluxes, with undistorted energy spectra, to be free parameters in fitting the measured solar neutrino event rates, subject only to the condition that the total observed luminosity of the Sun be produced by nuclear fusion. The rates of the five experiments prior to SNO (chlorine, Kamiokande, SAGE, GALLEX, Super-Kamiokande) cannot he fit by an arbitrary choice of undistorted neutrino fluxes at the level of 2.5sigma (formally 99% C.L.). Considering just SNO and Syper-Kamiokande, the discrepancy is at the 3.3sigma level (10(-3) C.L.). If all six experiments are fit simultaneously, the formal discrepancy increases to 4sigma (7 X 10(-5) C.L). If the relative scaling in temperature of the nuclear reactions that produce Be-7 and B-8 neutrinos is taken into account, the formal discrepancy is at the 7.4sigma level.
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