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Title: Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup

Abstract

We investigate the recent Daya Bay results on the changes in the antineutrino flux and spectrum with the burnup of the reactor fuel. We find that the discrepancy between current model predictions and the Daya Bay results can be traced to the original measured 235U/ 239Pu ratio of the fission beta spectra that were used as a base for the expected antineutrino fluxes. An analysis of the antineutrino spectra that is based on a summation over all fission fragment beta-decays, using nuclear database input, explains all of the features seen in the Daya Bay evolution data. However, this summation method still predicts an anomaly. Thus, we conclude that there is currently not enough information to use the antineutrino flux changes to rule out the possible existence of sterile neutrinos.

Authors:
 [1];  [2];  [1];  [2];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center (NNDC)
  3. Univ. of Washington, Seattle, WA (United States)
  4. Huzhou Univ., Huzhou (China). School of Science
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1376166
Alternate Identifier(s):
OSTI ID: 1416840; OSTI ID: 1438109
Report Number(s):
BNL-114138-2017-JA; LA-UR-17-26501
Journal ID: ISSN 0031-9007
Grant/Contract Number:  
SC0012704; AC02-98CH10886; AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics

Citation Formats

Hayes, A. C., Ricard-McCutchan, E. A., Jungman, Gerard, Sonzogni, A. A., Garvey, G. T., and Wang, X. B. Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.022503.
Hayes, A. C., Ricard-McCutchan, E. A., Jungman, Gerard, Sonzogni, A. A., Garvey, G. T., & Wang, X. B. Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup. United States. doi:10.1103/PhysRevLett.120.022503.
Hayes, A. C., Ricard-McCutchan, E. A., Jungman, Gerard, Sonzogni, A. A., Garvey, G. T., and Wang, X. B. Fri . "Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup". United States. doi:10.1103/PhysRevLett.120.022503. https://www.osti.gov/servlets/purl/1376166.
@article{osti_1376166,
title = {Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup},
author = {Hayes, A. C. and Ricard-McCutchan, E. A. and Jungman, Gerard and Sonzogni, A. A. and Garvey, G. T. and Wang, X. B.},
abstractNote = {We investigate the recent Daya Bay results on the changes in the antineutrino flux and spectrum with the burnup of the reactor fuel. We find that the discrepancy between current model predictions and the Daya Bay results can be traced to the original measured 235U/239Pu ratio of the fission beta spectra that were used as a base for the expected antineutrino fluxes. An analysis of the antineutrino spectra that is based on a summation over all fission fragment beta-decays, using nuclear database input, explains all of the features seen in the Daya Bay evolution data. However, this summation method still predicts an anomaly. Thus, we conclude that there is currently not enough information to use the antineutrino flux changes to rule out the possible existence of sterile neutrinos.},
doi = {10.1103/PhysRevLett.120.022503},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 2,
volume = 120,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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Cited by: 10 works
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Figures / Tables:

FIG. 1 FIG. 1: (top)The ratio of the 235U and 239Pu beta spectra. The data are from [6], and the curves are the ratios obtained by fitting the individual 235U and 239Pu data, using different assumptions. The different assumptions are explained in the text. Excellent fits were obtained in all cases. (bottom)Themore » ratio of the antineutrino spectra resulting from the fits. We note that the jagged structures largely reflect the fact that the fits only require about 25 endpoints; these effects are normally smoothed in published expected spectra.« less

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Works referenced in this record:

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