  The temporal and spatial coherence widths of the microscopic process by which
a neutrino is detected are incorporated in the quantum mechanical wave packet
treatment of neutrino oscillations, confirming the observation of Kiers,
Nussinov and Weiss that an accurate measurement of the energies of the
particles participating in the detection process can increase the coherence
length. However, the wave packet treatment presented here shows that the
coherence length has an upper bound, determined by the neutrino energy and the
mass-squared difference, beyond which the coherence of the oscillation process
is lost.
