Reactor fuel fraction information on the antineutrino anomaly

Giunti, C.; Ji, X. P.; Laveder, M.; Li, Y. F.; Littlejohn, B. R.

doi:10.1007/jhep10(2017)143

Title: Reactor fuel fraction information on the antineutrino anomaly

Journal Article · Fri Oct 20 00:00:00 EDT 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep10(2017)143· OSTI ID:1505155

Giunti, C. ^[1]; Ji, X. P. ^[2]; Laveder, M. ^[3]; Li, Y. F. ^[4]; Littlejohn, B. R. ^[5]

National Inst. of Nuclear Physics (INFN), Turin (Italy)
Tsinghua Univ., Beijing (China). Dept. of Engineering Physics
Univ. of Padua (Italy). Dept. of Physics and Astronomy “G. Galilei”; National Inst. of Nuclear Physics (INFN), Padua (Italy)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics. School of Physical Sciences
Illinois Inst. of Technology, Chicago, IL (United States). Physics Dept.

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.

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Research Organization:: Illinois Institute of Technology, Chicago, IL (United States); Tsinghua Univ., Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences

Grant/Contract Number:: SC0008347; 11235006; 11475093; 11305193; 11135009; XDA10010100

OSTI ID:: 1505155

Journal Information:: Journal of High Energy Physics (Online), Vol. 2017, Issue 10; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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