We have investigated matter enhanced neutrino oscillations with a mantle-core-mantle step function and a realistic Earth matter density profile in both a two- and a three-neutrino scenario. We found that the realistic Earth matter density profile can be well approximated with the mantle-core-mantle step function and that there could be an influence on the oscillation channel ν μ →ν τ due to resonant enhancement of one of the mixing angles.
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Freund et al. (2000) studied this question.
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