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 Quote by Vanadium 50 If you took a bucket of stopped pions, and could very, very accurately measure the electron energy in the decay π→e+v, you would see three peaks, one for each of the mass eigenstates. Essentially, there are three different decays: π→e+v1, π→e+v2, π→e+v3.
 Quote by robert2734 Isn't electronness conserved?
No. We know this because neutrino (flavor) oscillations exist. An antineutrino that was created together with an electron, e.g. in nuclear beta decay, can be absorbed in a reaction that produces a muon.

My interpretation of the mathematics is that if you could select a neutrino with a particular mass by measuring the electron energy precisely in the decay that V50 describes, then that neutrino would be a mixture of e, μ and τ neutrino states, at least from the moment that you measure the electron energy.

Furthermore, it would be a non-oscillating mixture because it would be a pure mass state. The probabilities of getting an e, μ or τ when the neutrino interacts, would be constant, and not vary with position or time as with neutrino oscillations.