Abstract :
The energy spectrum of recoil electrons from solar neutrino scattering, as observed by Superkamiokande, is deformed with respect to that expected from SSM calculations. We considered ν−e scattering from neutrinos produced by the electron-capture on 8B nuclei, e−+8B→8Be∗+νe, as a possible explanation of the spectral deformation. A flux ΦeB≃104 cm−2 s−1 could account for Superkamiokande solar neutrino data. However this explanation is untenable, since the theoretical prediction, ΦeB=(1.3±0.2) cm−2 s−1, is smaller by four orders of magnitude.
