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The present data on solar neutrinos may suggest matter effects resulting in (i) flavor conversion (Mikheyev-Smirnov-Wolfenstein effect) due to a nonzero neutrino mass and/or mixing and (ii) spin-flavor conversion due to a Majorana magnetic moment. Both possibilities can be explicitly tested in upcoming experiments (i) via the effect of Earth matter on ⁷Be neutrinos and (ii) by the detection of ⁸B antineutrinos during solar activity.
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Raghavan et al. (1991) studied this question.
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