Three-neutrino mixing and combined vacuum oscillations and MSW transitions of solar neutrinos
- Scuola Internazionale Superiore di Studi Avanzati, I-34013 Trieste (Italy)
Assuming three-flavor neutrino mixing takes place in vacuum, we investigate the possibility that the solar {nu}{sub e} take part in MSW transitions in the Sun due to {Delta}m{sub 31}{sup 2}{approximately}(10{sup {minus}7}{minus}10{sup {minus}4}) eV{sup 2}, followed by long wavelength vacuum oscillations on the way to the Earth, triggered by {Delta}m{sub 21}{sup 2} (or {Delta}m{sub 32}{sup 2}) {approximately}(10{sup {minus}12}{minus}10{sup {minus}10}) eV{sup 2}, {Delta}m{sub 31}{sup 2} and {Delta}m{sub 21}{sup 2} ({Delta}m{sub 32}{sup 2}) being the corresponding neutrino mass squared differences. The solar {nu}{sub e} survival probability is shown to be described in this case by a simple analytic expression. Depending on whether the vacuum oscillations are due to {Delta}m{sub 21}{sup 2} or {Delta}m{sub 32}{sup 2} there are two very different types of interplay between the MSW transitions and the vacuum oscillations of the solar {nu}{sub e}. Performing an analysis of the most recently published solar neutrino data we have found several qualitatively new solutions of the solar neutrino problem of the hybrid MSW transitions + vacuum oscillations type. The solutions differ in the way the pp, {sup 7}Be and {sup 8}B neutrino fluxes are affected by the transitions in the Sun and the oscillations in vacuum. The specific features of the new solutions are discussed. One of the distinctive predictions of the hybrid MSW + vacuum oscillation solutions found is the existence of strong and very characteristic distortions of the spectrum of {sup 8}B neutrinos. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 553202
- Journal Information:
- Physical Review, D, Vol. 56, Issue 11; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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