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Title: Prospects for improved understanding of isotopic reactor antineutrino fluxes

Abstract

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 $$^{235}\mathrm{U}$$-enriched cores and fits including Daya Bay's new fuel evolution result produce discrepant best-fit IBD yields for $$^{235}\mathrm{U}$$ and $$^{239}\mathrm{Pu}$$. This discrepancy can be alleviated in a global analysis of all data sets through simultaneous fitting of $$^{239}\mathrm{Pu}$$, $$^{235}\mathrm{U}$$, and $$^{238}\mathrm{U}$$ yields. The measured IBD yield of $$^{238}\mathrm{U}$$ in this analysis is $$(7.02\pm{}1.65)\times{}{10}^{{-}43}\text{ }\text{ }{\mathrm{cm}}^{2}/\text{fission}$$, 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 $$^{235}\mathrm{U}$$, $$^{238}\mathrm{U}$$, and $$^{239}\mathrm{Pu}$$, 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.

Authors:
; ;
Publication Date:
Research Org.:
Illinois Inst. of Technology, Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1417776
Alternate Identifier(s):
OSTI ID: 1498889
Grant/Contract Number:  
SC0008347
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; nuclear reactors; neutrinos; neutrino detectors; particle production

Citation Formats

Gebre, Y., Littlejohn, B. R., and Surukuchi, P. T. Prospects for improved understanding of isotopic reactor antineutrino fluxes. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.013003.
Gebre, Y., Littlejohn, B. R., & Surukuchi, P. T. Prospects for improved understanding of isotopic reactor antineutrino fluxes. United States. doi:10.1103/PhysRevD.97.013003.
Gebre, Y., Littlejohn, B. R., and Surukuchi, P. T. Tue . "Prospects for improved understanding of isotopic reactor antineutrino fluxes". United States. doi:10.1103/PhysRevD.97.013003.
@article{osti_1417776,
title = {Prospects for improved understanding of isotopic reactor antineutrino fluxes},
author = {Gebre, Y. and Littlejohn, B. R. and Surukuchi, P. T.},
abstractNote = {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 $^{235}\mathrm{U}$-enriched cores and fits including Daya Bay's new fuel evolution result produce discrepant best-fit IBD yields for $^{235}\mathrm{U}$ and $^{239}\mathrm{Pu}$. This discrepancy can be alleviated in a global analysis of all data sets through simultaneous fitting of $^{239}\mathrm{Pu}$, $^{235}\mathrm{U}$, and $^{238}\mathrm{U}$ yields. The measured IBD yield of $^{238}\mathrm{U}$ in this analysis is $(7.02\pm{}1.65)\times{}{10}^{{-}43}\text{ }\text{ }{\mathrm{cm}}^{2}/\text{fission}$, 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 $^{235}\mathrm{U}$, $^{238}\mathrm{U}$, and $^{239}\mathrm{Pu}$, 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.},
doi = {10.1103/PhysRevD.97.013003},
journal = {Physical Review D},
number = 1,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.97.013003

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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: One-dimensional χ2 profiles for the IBD yields σ5,8,9,1 obtained by applying the fit of Eq. (4) to global rate data (top), Daya Bay evolution data (middle), and the combined data set (bottom). The fit includes external constraints on σ8 and σ1 as described in the text. Profiles aremore » provided in terms of ×10−43 cm2/fission (left) and in terms of Ri = σ$^{meas}_i$ /σ$^{th}_i$ (right), the ratios of predicted and measured IBD yields.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.