### Abstract

We re-examine solutions to the solar neutrino oscillations, decaying neutrinos and a cooler center of the sun. Comparison of the Homestake and Kamiokande II observations implies that low-energy neutrinos are more suppressed than high-energy, disfavoring the large-mass adiabatic MSW resonance and allowing us to exclude non-standard solar models with a simple reduction of core temperature. Diagonal (sin^{2}2θ - 0.004-0.5, Δm^{2} {reversed tilde equals} 0.08-10 meV^{2}), vertical large-angle (sin^{2} {reversed tilde equals} 0.6-0.9, Δm^{2} {reversed tilde equals} 0.08-2, 4-60 meV^{2}), and part of the horizontal (sin^{2}2θ {reversed tilde equals} 0.02-0.6, Δm^{2} {reversed tilde equals} 80 meV^{2}) MSW solutions are compatible with these data (meV = 10^{-3} eV). The present SAGE results disfavor non-standard solar models and the horizontal MSW solution. Assuming ν_{e} → ν_{μ} conversion, we show that seesaw models of neutrino masses imply m_{νμ} = 0.3-9 meV, intermediate-scale symmetry breaking O(10^{9}-10^{12}) GeV, and a τ-neutrino mass with cosmological ramifications in some cases and laboratory or atmospheric ν_{μ} - ν_{τ} oscillations. While seesaw predictions for neutrino masses are model-dependent and subject to large uncertainties, we prove that leptonic mixing angles are similar to quark mixings for a wide range of models. We also present two specific seesaw models compatible with electroweak neutral current and proton decay constraints, including radiative corrections to the seesaw predictions.

Original language | English (US) |
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Pages (from-to) | 373-391 |

Number of pages | 19 |

Journal | Nuclear Physics, Section B |

Volume | 374 |

Issue number | 2 |

DOIs | |

State | Published - Apr 27 1992 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

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## Cite this

*Nuclear Physics, Section B*,

*374*(2), 373-391. https://doi.org/10.1016/0550-3213(92)90358-I