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One of the three kinds of neutrinos, the muon flavor, has
been found to and reappear as it travels hundreds of
kilometers through the Earth. The energy and flight distance,
from neutrino production in the atmosphere by cosmic
radiation to the underground instrument, provide a measure
of the difference between neutrino masses.
... Located in a specially carved out cavity in an old zinc mine=====================================================================
2,000 feet under Mount Ikena near Kamioka in the Japanese alps, ..
.. the functional behavior of this deficit indicates that muon
neutrinos oscillate, thus they have mass.