The discovery of neutrino oscillations has provided an opportunity for
study of a rich phenomenology of neutrino mixing and masses which may
have important consequences for early University cosmology.
Practicalities of some experiments to study these parameters require
broadband neutrino beams with energies between 500 MeV and 5 GeV and
targets with masses of order 10^8 kg. The experiments require a
detailed understanding of nucleon and pion production in neutrino
reactions on nuclei such as carbon, oxygen and argon. Neutrino
experiments at Fermi National Accelerator Laboratory and the Japan
Proton Accelerator Research Complex are trying to quantify our ability
to model these reactions. I will discuss the results of these
experiments, some of the progress made, and some of the puzzles
encountered.
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