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between different flavors in flight as a consequence. For example, an electron neutrino produced in a beta decay reaction may interact in a distant detector as a muon or tau neutrino. The three mass values are not yet known as of 2024, but laboratory experiments and cosmological observations have determined the differences of their squares, an upper limit on their sum (< ), and an upper limit on the mass of the electron neutrino. Neutrinos are fermions, which have spin of {{sfrac.

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