Motivated by the possibility of new and more accurate data about the flux of solar neutrinos and the neutrino spectrum in future SuperKamiokande experiments, we present in this paper the deformations produced in the spectrum of ${}^8\mathrm{B}$ neutrinos when oscillations have been taken into account. The results are presented for mixing angles $\omega$ in the range $0.0006<\mathrm{}{\sin }^2\omega <0.347,$ the differences of the squared masses $4.4\times {10}^{-5}\hspace{0.5em}{\mathrm{eV}}^2>\Delta {=m}_2^2-m_1^2>7\mathrm{}\times {10}^{-8}\hspace{0.5em}{\mathrm{eV}}^2,$ and for some values of the mixing angle $\phi$ and the squared mass $m_3^2.$ The degenerate case is analyzed as the two-neutrino case.

• Received 11 December 1998

DOI:https://doi.org/10.1103/PhysRevD.60.073001