  As the calorimetric method of neutrino-energy reconstruction is generally
considered to be largely insensitive to nuclear effects, its application seems
to be an effective way for reducing systematic uncertainties in oscillation
experiments. To verify the validity of this opinion, we quantitatively study
the sensitivity of the calorimetric energy reconstruction to the effect of
final-state interactions in an ideal detector and in a realistic scenario. We
find that when particles escaping detection carry away a non-negligible
fraction of neutrino energy, the calorimetric reconstruction method becomes
sensitive to nuclear effects which, in turn, affects the outcome of the
oscillation analysis. These findings suggest that the best strategy for
reduction of systematic uncertainties in future neutrino-oscillation
studies---such as the Deep Underground Neutrino Experiment---is to increase
their sensitivity to particles of low energy. The ambitious precision goals
appear also to require an extensive development of theoretical models capable
of providing an accurate predictions for exclusive cross sections of
well-controlled uncertainties.
