Sensitivities of Low Energy Reactor Neutrino Experiments

The low energy part of the reactor neutrino spectra has not been experimentally measured. Its uncertainties limit the sensitivities in certain reactor neutrino experiments. The origin of these uncertainties are discussed, and the effects on measurements of neutrino interactions with electrons and nuclei are studied. Comparisons are made with existing results. To optimize the sensitivities, experiments for ν̄e-e cross-sections measurements should focus on events with large (>1.5 MeV) recoil energy while those for neutrino magnetic moment searches should be based on events <100 keV. The merits and attainable accuracies for experiments using artificial neutrino sources are discussed. PACS Codes: 14.60.Lm, 13.15.+g, 28.41.-i.