LAST HOPE for an astrophysical solution to the solar neutrino problem

We discuss what appears the last hope for an astrophysical solution to the solar neutrino problem: a correlated variation of the astrophysical factors for the helium burning cross sections (S-33 and S-34) and either S-17 or the central temperature T-c. In this context, we recognize the important role played by the CNO neutrinos, In fact, we can obtain a fair fit to the experimental data only if three conditions are met simultaneously: the astrophysical factor S-33 is about 200 times what is presently estimated, the astrophysical factor S-17 is about 3 times larger and the N-13 and O-15 neutrino fluxes are negligible compared to the ones predicted by standard solar models. These conditions are not supported by the present data and their correlated combination is improbable.