  We perform a covariant wavepacket analysis of neutrino oscillations taking
into account the lifetime of the neutrino production process . We find that
flavour oscillations in space are washed out when the neutrinos are produced
from long lived resonances - and what may be observed in
appearance/disappearance experiments is a uniform conversion probability
independent of distance.
  The lifetime of the resonance which produces the neutrinos acts as the the
effective baseline of the experiment.
  For this reason the LSND experiment where neutrinos are produced from muon
decay has two orders of magnitude more sensitivity to neutrino mass square
difference than other experiments where the neutrinos are produced from pion or
kaon decays.We also show that there are no EPR type oscillations of the
secondary decay particles.
