Solar neutrino oscillations in the quasi-vacuum regime
Abstract
Motivated by recent experimental data, we study solar neutrino oscillations in the range 10-10 < delta m2/E < 10-7 eV2/MeV. In this range vacuum oscillations become increasingly affected by (solar and terrestrial) matter effects for increasing delta m2, smoothly reaching the MSW regime. A numerical study of matter effects in such "quasi-vacuum" regime is performed. The results are applied to the analysis of the recent solar neutrino phenomenology.
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