A study of the solar neutrino survival probability

We present a study of recent solar neutrino data using a Bayesian method. Assuming that only $\nu_e$ are observed in the Super-Kamiokande experiment our results show a marked supression of the survival probability at about 1 MeV, in good agreement with $\chi ^2$-based analyses. When the detection of $\nu_{\mu}$ by Super-Kamiokande is taken into account, assuming $\nu_e$ to $\nu_{\mu}$ oscillations, we find the largest suppression in survival probability at about 8.5 MeV.