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arxiv: 2311.12540 · v3 · pith:FCG45TZX · submitted 2023-11-21 · physics.ins-det

Analysis of reactor burnup simulation uncertainties for antineutrino spectrum prediction

A. Barresi , M. Borghesi , A. Cammi , D. Chiesa , L. Loi , M. Nastasi , E. Previtali , M. Sisti
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S. Aiello G. Andronico V. Antonelli D. Basilico M. Beretta A. Bergnoli A. Brigatti R. Brugnera R. Bruno A. Budano B. Caccianiga V. Cerrone R. Caruso C. Clementi S. Dusini A. Fabbri G. Felici F. Ferraro A. Garfagnini M. G. Giammarchi N. Giugice A. Gavrikov M. Grassi R. M. Guizzetti N. Guardone B. Jelmini C. Landini I. Lippi S. Loffredo P. Lombardi C. Lombardo F. Mantovani S. M. Mari A. Martini L. Miramonti M. Montuschi D. Orestano F. Ortica A. Paoloni E. Percalli F. Petrucci G. Ranucci A. C. Re M. Redchuck B. Ricci A. Romani P. Saggese G. Sava A. Serafini C. Sirignano L. Stanco E. Stanescu Farilla V. Strati M. D. C. Torri A. Triossi C. Tuv\`e C. Venettacci G. Verde L. Votano
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classification physics.ins-det
keywords reactorantineutrinosimulationspectrumanalysisexperimentfissionmeasurements
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Nuclear reactors are a source of electron antineutrinos due to the presence of unstable fission products that undergo $\beta^-$ decay. They will be exploited by the JUNO experiment to determine the neutrino mass ordering and to get very precise measurements of the neutrino oscillation parameters. This requires the reactor antineutrino spectrum to be characterized as precisely as possible both through high resolution measurements, as foreseen by the TAO experiment, and detailed simulation models. In this paper we present a benchmark analysis utilizing Serpent Monte Carlo simulations in comparison with real pressurized water reactor spent fuel data. Our objective is to study the accuracy of fission fraction predictions as a function of different reactor simulation approximations. Then, utilizing the BetaShape software, we construct fissile antineutrino spectra using the summation method, thereby assessing the influence of simulation uncertainties on reactor antineutrino spectrum.

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