What is the difference between the solar neutrino problem and the solar fusion problem?
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The solar neutrino problem refers to the discrepancy between the predicted and observed number of neutrinos coming from the Sun. Various theories have been proposed to explain this, including the existence of new interactions between neutrinos and nucleons mediated by massless pseudoscalar bosons . On the other hand, the solar fusion problem refers to understanding the nuclear reactions that occur in the Sun, particularly the pp and CNO reactions responsible for hydrogen burning. This involves studying the physical content of the standard solar models, the problem of the Sun's chemical composition, the expected neutrino energy spectrum, and the radial distributions of neutrino fluxes in the Sun . While the solar neutrino problem focuses on the discrepancy in observed neutrino fluxes, the solar fusion problem focuses on understanding the underlying nuclear reactions in the Sun.
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