Recent experiments at the Super Kamiokande neutrino detector in Japan have found evidence supporting this "neutrino oscillation". The possibility that the electron neutrinos change "flavor" and were thus not detected by the current experiments will be explored with the new Sudbury Neutrino Observatory. Of the possibilities explored, some involve changes in the neutrinos themselves before they reach the detectors.
More recent experiments at Super Kamiokande, the SAGE and GALLEX detectors, and the Sudbury Neutrino Observatory all get about half the expected neutrino flux, so the neutrino deficiency persists. Since we have accurate measurements of the amount of energy released by the Sun, a factor of three change in the rate of the main production reactions is hard to explain. The neutrinos detected were only about a third of those expected from the best models of the Sun's interior. Bahcall predicted a solar neutrino flux of 5 x 10 6 neutrinos/cm 2s from solar modeling.Īn early experiment consisted of a huge tank of perchloroethylene buried deep in the earth (the solar neutrino telescope). None of the other particles involved can penetrate out of the sun to be directly observed, so considerable effort has been devoted to trying to detect the solar neutrinos.
There are three reaction paths for proton-proton fusion which lead to the production of alpha particles, each of which liberates neutrinos. Our understanding of energy production in the Sun is that it comes mainly from the proton-proton cycle. Solar Neutrino Problem The Solar Neutrino Problem
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