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Self-induced flavor conversions near the supernova (SN) core can make thefluxes for different neutrino species become almost equal, potentially alteringthe dynamics of the SN explosion and washing out all further neutrinooscillation effects. We present a new model-independent analysis strategy forthe next galactic SN signal that will distinguish this flavor equalizationscenario from a matter effects only scenario during the SN accretion phase. Ourmethod does not rely on fitting or modelling the energy-dependent fluences ofthe different species to a known function, but rather uses a model-independentcomparison of charged-current and neutral-current events at largenext-generation underground detectors. Specifically, we advocate that theevents due to elastic scattering on protons in a scintillator detector, whichis insensitive to oscillation effects and can be used as a model-independentnormalization, should be compared with the events due to inverse beta decay of$\bar\nu_e$ in a water Cherenkov detector and/or the events due tocharged-current interactions of $\nu_e$ in an Argon detector. The ratio ofevents in these different detection channels allow one to distinguish acomplete flavor equalization from a pure matter effect, for either of theneutrino mass orderings, as long as the spectral differences among thedifferent species are not too small.

Model-independent diagnostic of self-induced spectral equalization versus ordinary matter effects in supernova neutrinos