Conversion of electron spectrum associated with fission into the antineutrino spectrum

Vogel, P.

doi:10.1103/physrevc.76.025504

Cited by 35 publications

(35 citation statements)

References 11 publications

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“…Pu via the beta conversion method [18]. The latter approach produced good agreement with existing reactor antineutrino flux and spectrum measurements at that time [19].…”

supporting

confidence: 59%

Prospects for improved understanding of isotopic reactor antineutrino fluxes

2018

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Predictions of antineutrino fluxes produced by fission isotopes in a nuclear reactor have recently received increased scrutiny due to observed differences in predicted and measured inverse beta decay (IBD) yields, referred to as the "reactor antineutrino flux anomaly." In this paper, global fits are applied to existing IBD yield measurements to produce constraints on antineutrino production by individual plutonium and uranium fission isotopes. We find that fits including measurements from highly 235 U-enriched cores and fits including Daya Bay's new fuel evolution result produce discrepant bestfit IBD yields for 235 U and 239Pu. This discrepancy can be alleviated in a global analysis of all data sets through simultaneous fitting of 239 Pu, 235 U, and 238 U yields. The measured IBD yield of 238 U in this analysis is ð7.02 AE 1.65Þ × 10 −43 cm 2 =fission, nearly two standard deviations below existing predictions. Future hypothetical IBD yield measurements by short-baseline reactor experiments are examined to determine their possible impact on the global understanding of isotopic IBD yields. It is found that future improved short-baseline IBD yield measurements at both high-enriched and low-enriched cores can significantly improve constraints for 235 U, 238 U, and 239 Pu, providing comparable or superior precision to existing conversion-and summation-based antineutrino flux predictions. Systematic and experimental requirements for these future measurements are also investigated.

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“…Pu via the beta conversion method [18]. The latter approach produced good agreement with existing reactor antineutrino flux and spectrum measurements at that time [19].…”

supporting

confidence: 59%

Prospects for improved understanding of isotopic reactor antineutrino fluxes

2018

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“…In our study, Z is the charge of the daughter nucleus, while in Refs. [16,25] it is the charge of the mother nucleus. Considering this difference, our Z(E 0 ) curve agrees with that in Ref.…”

Section: Statistical Properties Of the Beta Decay Databasementioning

confidence: 99%

“…In this method, the shape characteristics and the relation between the nuclear charge number and the endpoint energy of the beta decay branches are important uncertainty sources in the calculations of the isotopic antineutrino fluxes. In previous publications, the reliability and accuracy of the conversion method have been tested with the assumption of allowed beta decay transitions for all the virtual branches [16,25]. However, this simple treatment has been challenged by the incompatibility of the total inverse-beta-decay rate and energy spectrum between the theoretical calculations and experimental measurements [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

New realization of the conversion calculation for reactor antineutrino fluxes

Zhang

2019

Phys. Rev. D

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Validation of the effective conversion method in the reactor antineutrino flux calculation is examined using the ab initio calculation of the electron and antineutrino spectra from the state-of-the-art nuclear database. It turns out that neglecting the shape variation of beta decay branches between the allowed and forbidden transitions would induce significant bias in the total inverse-beta-decay yields and energy spectral distributions. We propose a new realization of the conversion method with both the allowed and forbidden virtual branches, and apply it to both the simulated data from the nuclear database and real data from the fission measurements at ILL by virtue of statistical properties of the allowed and forbidden decays in the database. Two kinds of dominant uncertainty sources are identified and it turns out that the new realization of the conversion calculation can largely reduce the rate and spectral bias and thus present a reliable prediction of the antineutrino fluxes if accurate beta decay information is available in the high endpoint energy range.

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“…By measuring the cumulative electron spectra due to all the fission daughters and their decay modes, one avoids the need to know the detailed aspects of each daughter. Modeling the electron spectrum as the sum of a large number of β -decays, the corresponding ν e spectrum can be calculated [12]. Nuclear corrections to β -decay do introduce slight asymmetries between the electron and ν e spectra, as summarized in [13].…”

Section: Current Measurementsmentioning

confidence: 99%

Estimation of reactor neutrino fluxes

Dwyer¹

2017

Proceedings of Neutrino Oscillation Workshop — PoS(NOW2016)

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Reactor antineutrinos have been indispensable for our understanding of neutrino mass and mixing. At the same time, discrepancies between the observed and predicted reactor ν e rate and energy spectra have grown as the precision of these measurements has improved. Measurements of the electrons emitted following fission result in the most precise predictions for the corresponding ν e flux, and our understanding of the potential systematic differences between the fission e − and ν e fluxes has improved. Measurements of individual fission daughter isotopes and their decays are fraught with uncertainties, yet still provide insight into these discrepancies. Detailed comparisons of ν e measurements among reactors are also shedding new light on this topic.

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Conversion of electron spectrum associated with fission into the antineutrino spectrum

Cited by 35 publications

References 11 publications

Prospects for improved understanding of isotopic reactor antineutrino fluxes

Prospects for improved understanding of isotopic reactor antineutrino fluxes

New realization of the conversion calculation for reactor antineutrino fluxes

Estimation of reactor neutrino fluxes

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