Matter-enhanced neutrino-oscillation parameters can be probed in a variety of conventional experiments in supergravity models where the small neutrino mass arises from spontaneous R-parity violation. A combined analysis of astrophysical and laboratory limits tends to exclude regions of oscillation parameters where the high-energy neutrinos are adiabatically converted. This suggests the possibility of a large reduction in the pp and ⁷Be neutrino flux even for a mildly reduced ⁸B neutrino flux, thus stressing the importance of gallium experiments.
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Santamaria et al. (1989) studied this question.
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