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Title: Reactor fuel fraction information on the antineutrino anomaly

Abstract

We analyzed the evolution data of the Daya Bay reactor neutrino experiment in terms of short-baseline active-sterile neutrino oscillations taking into account the theoretical uncertainties of the reactor antineutrino fluxes. We found that oscillations are disfavored at 2.6σ with respect to a suppression of the 235U reactor antineutrino flux and at 2.5σ with respect to variations of the 235U and 239Pu fluxes. On the other hand, the analysis of the rates of the short-baseline reactor neutrino experiments favor active-sterile neutrino oscillations and disfavor the suppression of the 235U flux at 3.1σ and variations of the 235U and 239Pu fluxes at 2.8σ. We also found that both the Daya Bay evolution data and the global rate data are well-fitted with composite hypotheses including variations of the 235U or 239Pu fluxes in addition to active-sterile neutrino oscillations. A combined analysis of the Daya Bay evolution data and the global rate data shows a slight preference for oscillations with respect to variations of the 235U and 239Pu fluxes. However, the best fits of the combined data are given by the composite models, with a preference for the model with an enhancement of the 239Pu flux and relatively large oscillations.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. National Inst. of Nuclear Physics (INFN), Turin (Italy)
  2. Tsinghua Univ., Beijing (China). Dept. of Engineering Physics
  3. Univ. of Padua (Italy). Dept. of Physics and Astronomy “G. Galilei”; National Inst. of Nuclear Physics (INFN), Padua (Italy)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics. School of Physical Sciences
  5. Illinois Inst. of Technology, Chicago, IL (United States). Physics Dept.
Publication Date:
Research Org.:
Illinois Inst. of Technology, Chicago, IL (United States); Tsinghua Univ., Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Natural Science Foundation of China (NNSFC); Chinese Academy of Sciences
OSTI Identifier:
1505155
Grant/Contract Number:  
SC0008347; 11235006; 11475093; 11305193; 11135009; XDA10010100
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; neutrino physics; Beyond Standard Model

Citation Formats

Giunti, C., Ji, X. P., Laveder, M., Li, Y. F., and Littlejohn, B. R. Reactor fuel fraction information on the antineutrino anomaly. United States: N. p., 2017. Web. doi:10.1007/jhep10(2017)143.
Giunti, C., Ji, X. P., Laveder, M., Li, Y. F., & Littlejohn, B. R. Reactor fuel fraction information on the antineutrino anomaly. United States. doi:10.1007/jhep10(2017)143.
Giunti, C., Ji, X. P., Laveder, M., Li, Y. F., and Littlejohn, B. R. Fri . "Reactor fuel fraction information on the antineutrino anomaly". United States. doi:10.1007/jhep10(2017)143. https://www.osti.gov/servlets/purl/1505155.
@article{osti_1505155,
title = {Reactor fuel fraction information on the antineutrino anomaly},
author = {Giunti, C. and Ji, X. P. and Laveder, M. and Li, Y. F. and Littlejohn, B. R.},
abstractNote = {We analyzed the evolution data of the Daya Bay reactor neutrino experiment in terms of short-baseline active-sterile neutrino oscillations taking into account the theoretical uncertainties of the reactor antineutrino fluxes. We found that oscillations are disfavored at 2.6σ with respect to a suppression of the 235U reactor antineutrino flux and at 2.5σ with respect to variations of the 235U and 239Pu fluxes. On the other hand, the analysis of the rates of the short-baseline reactor neutrino experiments favor active-sterile neutrino oscillations and disfavor the suppression of the 235U flux at 3.1σ and variations of the 235U and 239Pu fluxes at 2.8σ. We also found that both the Daya Bay evolution data and the global rate data are well-fitted with composite hypotheses including variations of the 235U or 239Pu fluxes in addition to active-sterile neutrino oscillations. A combined analysis of the Daya Bay evolution data and the global rate data shows a slight preference for oscillations with respect to variations of the 235U and 239Pu fluxes. However, the best fits of the combined data are given by the composite models, with a preference for the model with an enhancement of the 239Pu flux and relatively large oscillations.},
doi = {10.1007/jhep10(2017)143},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2017,
place = {United States},
year = {2017},
month = {10}
}

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Figures / Tables:

Figure 1 Figure 1: Fits of the Daya Bay evolution data [11] normalized to the Saclay-Huber theoretical predictions [4, 5, 9]. The error bars show only the uncorrelated statistical uncertainties.

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