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The large quantities of antineutrinos produced through the decay of fissionfragments in nuclear reactors provide an opportunity to study the properties ofthese particles and investigate their use in reactor monitoring. The reactorantineutrino spectra are measured using specialized, large area detectors thatdetect antineutrinos through inverse beta decay, electron elastic scattering,or coherent elastic neutrino nucleus scattering; although, inverse beta decayis the only demonstrated method so far. Reactor monitoring takes advantage ofthe differences in the antineutrino yield and spectra resulting from uraniumand plutonium fission providing an opportunity to estimate the fissile materialcomposition in the reactor. Recent experiments reveal a deviation between themeasured and calculated antineutrino flux and spectra indicating either theexistence of yet undiscovered neutrino physics, uncertainties in the reactorsource term calculation, incorrect nuclear data, or a combination of all three.  To address the nuclear data that impact the antineutrino spectrumcalculations and measurements, an international group of over 180 experts inantineutrino physics, reactor analysis, detector development, and nuclear datacame together during the Workshop on Nuclear Data for Reactor AntineutrinoMeasurements (WoNDRAM) to discuss nuclear data needs and achieve concordance ona set of recommended priorities for nuclear data improvements. Three topicalsessions provided a forum to gain consensus amongst the participants on themost important data improvements to address two goals: 1) understand thereactor anomaly and 2) improve the ability to monitor reactors usingantineutrinos. This report summarizes the outcomes of the workshop discussionsand the recommendations for nuclear data efforts that reduce reactorantineutrino measurement uncertainties.

osti oai (u.s. department of energy office of scientific and technical information)

Nuclear Data to Reduce Uncertainties in Reactor Antineutrino  Measurements: Summary Report of the Workshop on Nuclear Data for Reactor  Antineutrino Measurements (WoNDRAM)