Reevaluating reactor antineutrino spectra with new measurements of the ratio between <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>235</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Pu</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>239</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math> spectra
V. I. Kopeǐkin, M. Skorokhvatov, O. A. Titov
Abstract
Over the last decade, a discrepancy between the theoretical and measured values of the antineutrino spectrum at nuclear reactors has remained unresolved and been dubbed the reactor antineutrino anomaly (RAA). In the present paper, a resolution to this anomaly is proposed based on recent experimental results on the beta spectra of U(235) and Pu(239) obtained at the National Research Centre Kurchatov Institute (KI). These measurements indicate a systematic excess in the spectra on which the discrepant theoretical model was based. The adjusted predictions are now consistent with the Daya Bay and STEREO reactor experiments.
Topics & Concepts
Spectral lineHigh resolutionAnomaly (physics)Nuclear physicsPhysicsGeologyRemote sensingCondensed matter physicsAstronomyNeutrino Physics ResearchParticle physics theoretical and experimental studiesAdvanced NMR Techniques and Applications