Journal of High Energy Physics

, 2019:143 | Cite as

Uncertainty in the reactor neutrino spectrum and mass hierarchy determination

  • E. CiuffoliEmail author
  • J. Evslin
  • H. Mohammed
Open Access
Regular Article - Experimental Physics


One of the challenges that must be overcome in order to determine the neutrino mass hierarchy using reactor neutrinos is the theoretical uncertainty in the unoscillated reactor neutrino spectrum: this is one of the reasons why, recently, it was proposed to add a near detector to the JUNO experiment. A model-independent treatment of the spectrum uncertainty will be discussed, as well as the effect that it will have on the final result. Moreover, since the neutrino spectrum depends on the chemical composition of the fuel, the spectra at the near and far detectors will be different, because they will receive neutrinos from different cores. Taking into account the time evolution of the chemical composition of the fuel in the reactor core, it is possible to reconstruct the far detector spectrum from the near detector data. We will show that the method used to reconstruct the spectrum can affect sensitivity to the mass hierarchy, however if the near detector is large enough the difference will be negligible.


Neutrino Detectors and Telescopes (experiments) Oscillation 


Open Access

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  1. [1]
    K. Abe et al., Proposal for an extended run of T2K to 20 × 1021POT, arXiv:1609.04111 [INSPIRE].
  2. [2]
    D. Ayres et al., Letter of intent to build an off-axis detector to study νμ to νe oscillations with the NuMI neutrino beam, hep-ex/0210005 [INSPIRE].
  3. [3]
    KM3NeT collaboration, The ORCA option for KM3NeT, PoS(Neutel 2013)057 [arXiv:1402.1022] [INSPIRE].
  4. [4]
    KM3Net collaboration, Letter of intent for KM3NeT 2.0, J. Phys.G 43 (2016) 084001 [arXiv:1601.07459] [INSPIRE].
  5. [5]
    IceCube PINGU collaboration, Letter of intent: the Precision Icecube Next Generation Upgrade (PINGU), arXiv:1401.2046 [INSPIRE].
  6. [6]
    DUNE collaboration, Long-Baseline Neutrino Facility (LBNF) and Deep Underground Neutrino Experiment (DUNE), arXiv:1512.06148 [INSPIRE].
  7. [7]
    JUNO collaboration, Neutrino physics with JUNO, J. Phys.G 43 (2016) 030401 [arXiv:1507.05613] [INSPIRE].
  8. [8]
    M. Wascko, T2K status, results, and plans, talk given at the XXVIII International Conference on Neutrino Physics and Astrophysics , June 4–9, Heidelberg, Germany (2018).Google Scholar
  9. [9]
    M. Sanchez, NOνA results and prospects, talk given at the XXVIII International Conference on Neutrino Physics and Astrophysics , June 4–9, Heidelberg, Germany (2018).Google Scholar
  10. [10]
    F. Capozzi et al., Global constraints on absolute neutrino masses and their ordering, Phys. Rev.D 95 (2017) 096014 [arXiv:1703.04471] [INSPIRE].
  11. [11]
    S. Vagnozzi et al., Unveiling ν secrets with cosmological data: neutrino masses and mass hierarchy, Phys. Rev.D 96 (2017) 123503 [arXiv:1701.08172] [INSPIRE].
  12. [12]
    B. Wonsak, Status and prospects of the JUNO experiment, talk given at the XXVIII International Conference on Neutrino Physics and Astrophysics, June 4–9, Heidelberg, Germany (2018).Google Scholar
  13. [13]
    Y.P. Cheng, Physics potential and status of JUNO, talk given at NuPhys2018: Prospects in Neutrino Physics, December 19–21 London, U.K. (2018).Google Scholar
  14. [14]
    E. Ciuffoli, Uncertainty in the reactor neutrino spectrum and mass hierarchy determination, talk given at the PhysStat-ν, January 22–25 CERN, Geneva, Switzerland (2019).Google Scholar
  15. [15]
    S.T. Petcov and M. Piai, The LMA MSW solution of the solar neutrino problem, inverted neutrino mass hierarchy and reactor neutrino experiments, Phys. Lett.B 533 (2002) 94 [hep-ph/0112074] [INSPIRE].
  16. [16]
    Particle Data Group collaboration, Review of particle physics, Phys. Rev.D 98 (2018) 030001 [INSPIRE].
  17. [17]
    E. Ciuffoli et al., Advantages of multiple detectors for the neutrino mass hierarchy determination at reactor experiments, Phys. Rev.D 89 (2014) 073006 [arXiv:1308.0591] [INSPIRE].
  18. [18]
    X. Qian et al., Mass hierarchy resolution in reactor anti-neutrino experiments: parameter degeneracies and detector energy response, Phys. Rev.D 87 (2013) 033005 [arXiv:1208.1551] [INSPIRE].
  19. [19]
    F. Capozzi, E. Lisi and A. Marrone, Neutrino mass hierarchy and electron neutrino oscillation parameters with one hundred thousand reactor events, Phys. Rev.D 89 (2014) 013001 [arXiv:1309.1638] [INSPIRE].
  20. [20]
    P. Huber, On the determination of anti-neutrino spectra from nuclear reactors, Phys. Rev.C 84 (2011) 024617 [Erratum ibid.C 85 (2012) 029901] [arXiv:1106.0687] [INSPIRE].
  21. [21]
    T.A. Mueller et al., Improved predictions of reactor antineutrino spectra, Phys. Rev.C 83 (2011) 054615 [arXiv:1101.2663] [INSPIRE].
  22. [22]
    D.A. Dwyer and T.J. Langford, Spectral structure of electron antineutrinos from nuclear reactors, Phys. Rev. Lett.114 (2015) 012502 [arXiv:1407.1281] [INSPIRE].
  23. [23]
    A.C. Hayes et al., Possible origins and implications of the shoulder in reactor neutrino spectra, Phys. Rev.D 92 (2015) 033015 [arXiv:1506.00583] [INSPIRE].
  24. [24]
    D.V. Forero, R. Hawkins and P. Huber, The benefits of a near detector for JUNO, arXiv:1710.07378 [INSPIRE].
  25. [25]
    D.L. Danielson, A.C. Hayes and G.T. Garvey, Reactor neutrino spectral distortions play little role in mass hierarchy experiments, Phys. Rev.D 99 (2019) 036001 [arXiv:1808.03276] [INSPIRE].
  26. [26]
    A. Hayes, Atatus of reactor antineutrino flux predictions, talk given at the XXVIII International Conference on Neutrino Physics and Astrophysics , June 4–9, Heidelberg, Germany (2018).Google Scholar
  27. [27]
    E. Ciuffoli, J. Evslin and X. Zhang, The high energy neutrino nuisance at a medium baseline reactor experiment, Phys. Lett.B 728 (2014) 634 [arXiv:1208.4800] [INSPIRE].
  28. [28]
    E. Ciuffoli, J. Evslin and X. Zhang, Mass hierarchy determination using neutrinos from multiple reactors, JHEP12 (2012) 004 [arXiv:1209.2227] [INSPIRE].
  29. [29]
    B.R. Littlejohn et al., Impact of fission neutron energies on reactor antineutrino spectra, Phys. Rev.D 97 (2018) 073007 [arXiv:1803.01787] [INSPIRE].
  30. [30]
    C. Giunti et al., Reactor fuel fraction information on the antineutrino anomaly, JHEP10 (2017) 143 [arXiv:1708.01133] [INSPIRE].
  31. [31]
    Daya Bay collaboration, Evolution of the reactor antineutrino flux and spectrum at Daya Bay, Phys. Rev. Lett.118 (2017) 251801 [arXiv:1704.01082] [INSPIRE].

Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.Institute of Modern PhysicsLanzhouChina
  2. 2.University of the Chinese Academy of SciencesBeijingChina

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