Abstract
We take another look at “Just-So” solar neutrino oscillations, characterizing them by the energy Eπ/2 at which the distance-varying angle is π/2, instead of by the usual Δm2. The rising spectrum recently observed by SuperKamiokande is consistent with an Eπ/2 ∼6–9 MeV and marginally with 48 MeV. The pp neutrinos must then be reduced to one-half the standard solar model prediction, and 7Be neutrinos must make up a significant part of the SAGE and GALLEX gallium signal. For Eπ/2 close to 9 and 48 MeV, the 7Be neutrinos will also show a large seasonal variation, emphasizing the importance of direct measurements of the 7Be neutrinos.
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Gelb, J.M., Rosen, S.P. Another Look at Just-So Solar Neutrino Oscillations. Foundations of Physics 30, 599–606 (2000). https://doi.org/10.1023/A:1003625029844
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DOI: https://doi.org/10.1023/A:1003625029844