Counting Electrons to Probe the Neutrino Mass Hierarchy

After the successful measurement of the mixing angle $θ_{13}$, the determination of the neutrino mass hierarchy has become a priority for future neutrino experiments. We propose a conventional $ν_μ$ beam with neutrino energies in the range 2-8 GeV aimed at a Mton underwater detector at the "magic" baseline of 2600 km. In this constellation it is sufficient to distinguish ($ν_μ$ induced) track-like interactions from cascade-like interactions with moderate purity to determine the mass hierarchy.

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