  We show that supernova neutrinos can be studied by observing their
charged-current interactions with $^{100}$Mo, which has strong spin-isospin
giant resonances. Information about both the effective temperature of the
electron neutrino sphere and the oscillation into electron neutrinos of other
flavors can be extracted from the electron (inverse $\beta$) spectrum. We use
measured hadronic charge-exchange spectra and the Quasiparticle Random Phase
Approximation to calculate the charged-current response of $^{100}$Mo to
electron neutrinos from supernovae, with and without the assumption of
oscillations. A scaled up version of the MOON detector for $\beta \beta$ and
solar-neutrino studies could potentially be useful for spectroscopic studies of
supernova neutrinos as well.
