Measurement of the Antineutrino Spectrum from U 235 Fission at HFIR with PROSPECT

(PROSPECT Collaboration)

doi:10.1103/PhysRevLett.122.251801

Measurement of the Antineutrino Spectrum from U 235 Fission at HFIR with PROSPECT

(PROSPECT Collaboration)

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Abstract

This Letter reports the first measurement of the U235 νe energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MWth highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) νe-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to U235. Despite broad agreement, comparison of the Huber U235 model to the measured spectrum produces a χ2/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured U235 spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the νe energy region of 5-7 MeV.

Original language	English
Article number	251801
Journal	Physical Review Letters
Volume	122
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.122.251801
State	Published - Jun 28 2019

Funding

This material is based upon work supported by the following sources: U.S. Department of Energy (DOE) Office of Science, Office of High Energy Physics under Grants No. DE-SC0016357 and No. DE-SC0017660 to Yale University, under Award No. DE-SC0017815 to Drexel University, under Award No. DE-SC0008347 to Illinois Institute of Technology, under Award No. DE-SC0016060 to Temple University, under Contract No. DE-SC0012704 to Brookhaven National Laboratory, and under Work Proposal Number SCW1504 to Lawrence Livermore National Laboratory. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344 and by Oak Ridge National Laboratory under Contract No. DE-AC05-00OR22725. Additional funding for the experiment was provided by the Heising-Simons Foundation under Grant No. 2016-117 to Yale University. J. G. is supported through the NSF Graduate Research Fellowship Program and A. C. performed work under appointment to the Nuclear Nonproliferation International Safeguards Fellowship Program sponsored by the National Nuclear Security Administration’s Office of International Nuclear Safeguards (NA-241). This work was also supported by the Canada First Research Excellence Fund (CFREF), and the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery program under Grant No. RGPIN-2018-04989, and Province of Ontario. We further acknowledge support from Yale University, the Illinois Institute of Technology, Temple University, Brookhaven National Laboratory, the Lawrence Livermore National Laboratory LDRD program, the National Institute of Standards and Technology, and Oak Ridge National Laboratory. We gratefully acknowledge the support and hospitality of the High Flux Isotope Reactor and Oak Ridge National Laboratory, managed by UT-Battelle for the U.S. Department of Energy.

Funders	Funder number
National Nuclear Security Administration’s Office of International Nuclear Safeguards	NA-241
UT-Battelle
National Science Foundation
U.S. Department of Energy
National Institute of Standards and Technology
Yale University
Office of Science
High Energy Physics	DE-SC0016060, DE-SC0016357
Lawrence Livermore National Laboratory	DE-AC52-07NA27344
Oak Ridge National Laboratory
Brookhaven National Laboratory
Temple University
Illinois Institute of Technology
Heising-Simons Foundation	2016-117
Natural Sciences and Engineering Research Council of Canada
Canada First Research Excellence Fund

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10.1103/PhysRevLett.122.251801

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@article{d5d74f29b2c741feb1518436a66d0d2d,

title = "Measurement of the Antineutrino Spectrum from U 235 Fission at HFIR with PROSPECT",

abstract = "This Letter reports the first measurement of the U235 νe energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MWth highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) νe-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to U235. Despite broad agreement, comparison of the Huber U235 model to the measured spectrum produces a χ2/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured U235 spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the νe energy region of 5-7 MeV.",

author = "{(PROSPECT Collaboration)} and J. Ashenfelter and Balantekin, {A. B.} and Band, {H. R.} and Bass, {C. D.} and Bergeron, {D. E.} and D. Berish and Bowden, {N. S.} and Brodsky, {J. P.} and Bryan, {C. D.} and Cherwinka, {J. J.} and T. Classen and Conant, {A. J.} and Cox, {A. A.} and D. Davee and D. Dean and G. Deichert and Diwan, {M. V.} and Dolinski, {M. J.} and A. Erickson and M. Febbraro and Foust, {B. T.} and Gaison, {J. K.} and A. Galindo-Uribarri and Gilbert, {C. E.} and Gilje, {K. E.} and Hackett, {B. T.} and S. Hans and Hansell, {A. B.} and Heeger, {K. M.} and J. Insler and Jaffe, {D. E.} and X. Ji and Jones, {D. C.} and O. Kyzylova and Lane, {C. E.} and Langford, {T. J.} and J. Larosa and Littlejohn, {B. R.} and X. Lu and {Martinez Caicedo}, {D. A.} and Matta, {J. T.} and McKeown, {R. D.} and Mendenhall, {M. P.} and Minock, {J. M.} and Mueller, {P. E.} and Mumm, {H. P.} and J. Napolitano and R. Neilson and Nikkel, {J. A.} and D. Norcini",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = jun,

day = "28",

doi = "10.1103/PhysRevLett.122.251801",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

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T1 - Measurement of the Antineutrino Spectrum from U 235 Fission at HFIR with PROSPECT

AU - (PROSPECT Collaboration)

AU - Ashenfelter, J.

AU - Balantekin, A. B.

AU - Band, H. R.

AU - Bass, C. D.

AU - Bergeron, D. E.

AU - Berish, D.

AU - Bowden, N. S.

AU - Brodsky, J. P.

AU - Bryan, C. D.

AU - Cherwinka, J. J.

AU - Classen, T.

AU - Conant, A. J.

AU - Cox, A. A.

AU - Davee, D.

AU - Dean, D.

AU - Deichert, G.

AU - Diwan, M. V.

AU - Dolinski, M. J.

AU - Erickson, A.

AU - Febbraro, M.

AU - Foust, B. T.

AU - Gaison, J. K.

AU - Galindo-Uribarri, A.

AU - Gilbert, C. E.

AU - Gilje, K. E.

AU - Hackett, B. T.

AU - Hans, S.

AU - Hansell, A. B.

AU - Heeger, K. M.

AU - Insler, J.

AU - Jaffe, D. E.

AU - Ji, X.

AU - Jones, D. C.

AU - Kyzylova, O.

AU - Lane, C. E.

AU - Langford, T. J.

AU - Larosa, J.

AU - Littlejohn, B. R.

AU - Lu, X.

AU - Martinez Caicedo, D. A.

AU - Matta, J. T.

AU - McKeown, R. D.

AU - Mendenhall, M. P.

AU - Minock, J. M.

AU - Mueller, P. E.

AU - Mumm, H. P.

AU - Napolitano, J.

AU - Neilson, R.

AU - Nikkel, J. A.

AU - Norcini, D.

PY - 2019/6/28

Y1 - 2019/6/28

N2 - This Letter reports the first measurement of the U235 νe energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MWth highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) νe-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to U235. Despite broad agreement, comparison of the Huber U235 model to the measured spectrum produces a χ2/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured U235 spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the νe energy region of 5-7 MeV.

AB - This Letter reports the first measurement of the U235 νe energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MWth highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) νe-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to U235. Despite broad agreement, comparison of the Huber U235 model to the measured spectrum produces a χ2/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured U235 spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the νe energy region of 5-7 MeV.

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U2 - 10.1103/PhysRevLett.122.251801

DO - 10.1103/PhysRevLett.122.251801

M3 - Article

C2 - 31347897

AN - SCOPUS:85068602267

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

M1 - 251801

ER -

Measurement of the Antineutrino Spectrum from U 235 Fission at HFIR with PROSPECT

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