  The excess of solar-neutrino events above 13 MeV that has been recently
observed by Superkamiokande can be explained by vacuum oscillations (VO). If
the boron neutrino flux is 20% smaller than the standard solar model (SSM)
prediction and the chlorine signal is assumed 30% (or 3.5 sigmas) higher than
the measured one, there exists a VO solution that reproduces both the observed
boron neutrino spectrum, including the high energy distortion, and the other
measured neutrino rates. This solution might already be testable by the
predicted anomalous seasonal variation of the gallium signal. Its most distinct
signature, a large anomalous seasonal variation of Be7 neutrino flux, can be
easily observed by the future detectors, BOREXINO and LENS.
