Measurement of the Antineutrino Spectrum from U235 Fission at HFIR with PROSPECT

Ashenfelter, J.; Balantekin, A. B.; Band, H. R.; Bass, C. D.; Bergeron, D. E.; Berish, D.; Bowden, N. S.; Brodsky, J. P.; Bryan, C. D.; Cherwinka, J. J.; Classen, T.; Conant, A. J.; Cox, A. A.; Davee, D.; Dean, D.; Deichert, G.; Diwan, M. V.; Dolinski, M. J.; Erickson, A.; Febbraro, M.; Foust, B. T.; Gaison, J. K.; Galindo-Uribarri, A.; Gilbert, C. E.; Gilje, K. E.; Hackett, B. T.; Hans, S.; Hansell, A. B.; Heeger, K. M.; Insler, J.; Jaffe, D. E.; Ji, X.; Jones, D. C.; Kyzylova, O.; Lane, C. E.; Langford, T. J.; LaRosa, J.; Littlejohn, B. R.; Lu, X.; Martinez Caicedo, D. A.; Matta, J. T.; McKeown, R. D.; Mendenhall, M. P.; Minock, J. M.; Mueller, P. E.; Mumm, H. P.; Napolitano, J.; Neilson, R.; Nikkel, J. A.; Norcini, D.; Nour, S.; Pushin, D. A.; Qian, X.; Romero-Romero, E.; Rosero, R.; Sarenac, D.; Surukuchi, P. T.; Telles, A. B.; Tyra, M. A.; Varner, R. L.; Viren, B.; White, C.; Wilhelmi, J.; Wise, T.; Yeh, M.; Yen, Y. -R.; Zhang, A.; Zhang, C.; Zhang, X.

doi:10.1103/PhysRevLett.122.251801

Title: Measurement of the Antineutrino Spectrum from ${}^{235}U$ Fission at HFIR with PROSPECT

Journal Article · Fri Jun 28 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.251801· OSTI ID:1542278

Ashenfelter, J.; Balantekin, A. B.; Band, H. R.; Bass, C. D.; Bergeron, D. E.; Berish, D.; Bowden, N. S.; Brodsky, J. P.; Bryan, C. D.; Cherwinka, J. J.; Classen, T.; Conant, A. J.; Cox, A. A.; Davee, D.; Dean, D.; Deichert, G.; Diwan, M. V.; Dolinski, M. J.; Erickson, A.; Febbraro, M. more »

This Letter reports the first measurement of the ²³⁵U $$\bar{ν}$$_e energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MW_th highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) $$\bar{ν}$$_e-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to ²³⁵U. Despite broad agreement, comparison of the Huber ²³⁵U model to the measured spectrum produces a χ²/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured ²³⁵U spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the $$\bar{ν}$$_e energy region of 5–7 MeV.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States); Drexel Univ., Philadelphia, PA (United States); Illinois Institute of Technology, Chicago, IL (United States); Temple Univ., Philadelphia, PA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: PROSPECT Collaboration 3

Grant/Contract Number:: SC0012704; SC0016357; SC0017660; SC0017815; SC0008347; SC0016060; AC52-07NA27344; AC05-00OR22725

OSTI ID:: 1542278

Alternate ID(s):: OSTI ID: 1546314; OSTI ID: 1557949; OSTI ID: 1564220; OSTI ID: 1595061

Report Number(s):: BNL-211845-2019-JAAM; LLNL-JRNL-767132; PRLTAO

Journal Information:: Physical Review Letters, Vol. 122, Issue 25; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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

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Title: Measurement of the Antineutrino Spectrum from ${}^{235}U$ Fission at HFIR with PROSPECT