Reactor fuel fraction information on the antineutrino anomaly

Giunti, C.; Ji, X.; Laveder, M.; Li, Yu-Feng; Littlejohn, B. R.

doi:10.1007/jhep10(2017)143

Cited by 56 publications

(57 citation statements)

References 41 publications

(132 reference statements)

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“…These discontinuities are also reflected in the 235 þ 239 global fit of Ref. [42]. This discontinuity between Daya Bay evolution and global rate data sets naturally results in a higher χ (2018) yields a best-fit value of ð6.39 AE 0.10Þ × 10 −43 cm 2 =fission, nearly identical to the fit of all global rate data shown in Fig.…”

supporting

confidence: 56%

“…On the other hand, the discontinuity could be reduced while still including all data sets. Reference [42] has shown that models including both sterile neutrinos and incorrect flux predictions provide a good fit to global IBD yield data. In addition, we have shown in this analysis that an improved combined fit is obtained by allowing incorrect …”

Section: Impact Of Variations In Experimental Parametersmentioning

confidence: 99%

“…Recent inclusion of the Daya Bay evolution data set in these fits has produced mixed results, with a preference for "composite models" including both incorrect flux predictions and sterile neutrino oscillations [42].…”

mentioning

confidence: 99%

“…We begin by reproducing aspects of the global fit in Refs. [38,41,42] as a consistency check, while highlighting discontinuities present between measurements at Daya Bay and at HEU cores. We then show that a combined fit to all IBD yield data can also be utilized to produce a measurement ofν e production by 238 U and that the central value of this measurement differs from existing predictions.…”

mentioning

confidence: 99%

“…[42] for determining a data set's preference for one of two non-nested models. First, we generate Monte Carlo toys following the common conversion error hypothesis for each of the five experimental scenarios listed above.…”

mentioning

confidence: 99%

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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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supporting

confidence: 56%

Section: Impact Of Variations In Experimental Parametersmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Prospects for improved understanding of isotopic reactor antineutrino fluxes

2018

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Sterile neutrinos and the global reactor antineutrino dataset

Berryman

2021

J. High Energ. Phys.

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We present results from global fits to the available reactor antineutrino dataset, as of Fall 2019, to determine the global preference for a fourth, sterile neutrino. We have separately considered experiments that measure the integrated inverse-beta decay (IBD) rate from those that measure the energy spectrum of IBD events at one or more locations. The evidence that we infer from rate measurements varies between ≲ 3σ and negligible depending on the reactor antineutrino flux model employed. Moreover, we find that spectral ratios ostensibly imply ≳ 3σ evidence, consistent with previous work, though these measurements are known to be plagued by issues related to statistical interpretation; these results should therefore be viewed cautiously. The software used is the newly developed GLoBESfit tool set which is based on the publicly available GLoBES framework and will be released as open-source software.

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Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data

Berryman

Coloma

Schwetz

et al. 2022

J. High Energ. Phys.

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We evaluate the statistical significance of the 3+1 sterile-neutrino hypothesis using νe and $$ \overline{\nu} $$ ν ¯ e disappearance data from reactor, solar and gallium radioactive source experiments. Concerning the latter, we investigate the implications of the recent BEST results. For reactor data we focus on relative measurements independent of flux predictions. For the problem at hand, the usual χ2-approximation to hypothesis testing based on Wilks’ theorem has been shown in the literature to be inaccurate. We therefore present results based on Monte Carlo simulations, and find that this typically reduces the significance by roughly 1 σ with respect to the naïve expectation. We find no significant indication in favor of sterile-neutrino oscillations from reactor data. On the other hand, gallium data (dominated by the BEST result) show more than 5 σ of evidence supporting the sterile-neutrino hypothesis, favoring oscillation parameters in agreement with constraints from reactor data. This explanation is, however, in significant tension (∼ 3 σ) with solar neutrino experiments. In order to assess the robustness of the signal for gallium experiments we present a discussion of the impact of cross-section uncertainties on the results.

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Reactor fuel fraction information on the antineutrino anomaly

Cited by 56 publications

References 41 publications

Prospects for improved understanding of isotopic reactor antineutrino fluxes

Prospects for improved understanding of isotopic reactor antineutrino fluxes

Sterile neutrinos and the global reactor antineutrino dataset

Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data

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