Another Look at Just-So Solar Neutrino Oscillations

Original · EN

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 the usual Δm². The rising spectrum recently observed by SuperKamiokande is consistent with 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.