Establishing a numu,tau Component in the Solar Neutrino Flux
Andre de Gouvea, Hitoshi Murayama
Abstract
We point out that the recoil electron kinetic energy spectra in the nu-e elastic scattering are different for incident nue or numu,tau, and hence one can in principle establish the existence of the numu,tau component in the solar neutrino flux by fitting the shape of the spectrum. This would be a new model-independent test of the solar neutrino oscillation in a single experiment, free from astrophysical and nuclear physics uncertainties. For the 7Be neutrinos, it is possible to determine the numu,tau component at BOREXINO or KamLAND, if the background is sufficiently low. Note that this effect is different from the distortion in the incident neutrino energy spectrum, which has been discussed in the literature.
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