Antineutrino Energy Spectrum Unfolding Based on the Daya Bay Measurement and Its Applications

Abstract

The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era. The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment, in combination with the fission rates of fissile isotopes in the reactor, is used to extract the positron energy spectra resulting from the fission of specific isotopes. This information can be used to produce a precise, data-based prediction of the antineutrino energy spectrum in other reactor antineutrino experiments with different fission fractions than Daya Bay. The positron energy spectra are unfolded to obtain the antineutrino energy spectra by removing the contribution from detector response with the Wiener-SVD unfolding method. Consistent results are obtained with other unfolding methods. A technique to construct a data-based prediction of the reactor antineutrino energy spectrum is proposed and investigated. Given the reactor fission fractions, the technique can predict the energy spectrum to a 2% precision. In addition, we illustrate how to perform a rigorous comparison between the unfolded antineutrino spectrum and a theoretical model prediction that avoids the input model bias of the unfolding method.

22 pages, 10 figures, 6 supplemental materials

References in corpus (11)

• Observation of electron-antineutrino disappearance at Daya Bay
• The Reactor Antineutrino Anomaly
• Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
• Sterile neutrino search at NEOS Experiment
• Spectral Structure of Electron Antineutrinos from Nuclear Reactors
• Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes
• Improved Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Constraints on elastic neutrino nucleus scattering in the fully coherent regime from the CONUS experiment
• TAO Conceptual Design Report: A Precision Measurement of the Reactor Antineutrino Spectrum with Sub-percent Energy Resolution
• Background Studies for the MINER Coherent Neutrino Scattering Reactor Experiment
• A high precision calibration of the nonlinear energy response at Daya Bay

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