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arXiv:1812.10877 (nucl-ex)
[Submitted on 28 Dec 2018 (v1), last revised 28 Jun 2019 (this version, v2)]

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

Authors:PROSPECT Collaboration, J. Ashenfelter, A. B. Balantekin, H. R. Band, C. D. Bass, D. E. Bergeron, D. Berish, N. S. Bowden, J. P. Brodsky, C. D. Bryan, J. J. Cherwinka, T. Classen, A. J. Conant, A. A. Cox, D. Davee, D. Dean, G. Deichert, M. V. Diwan, M. J. Dolinski, A. Erickson, M. Febbraro, B. T. Foust, J. K. Gaison, A. Galindo-Uribarri, C. E. Gilbert, K. E. Gilje, B. T. Hackett, S. Hans, A. B. Hansell, K. M. Heeger, J. Insler, D. E. Jaffe, X. Ji, D. C. Jones, O. Kyzylova, C. E. Lane, T. J. Langford, J. LaRosa, B. R. Littlejohn, X. Lu, D. A. Martinez Caicedo, J. T. Matta, R. D. McKeown, M. P. Mendenhall, J. M. Minock, P. E. Mueller, H. P. Mumm, J. Napolitano, R. Neilson, J. A. Nikkel, D. Norcini, S. Nour, D. A. Pushin, X. Qian, E. Romero-Romero, R. Rosero, D. Sarenac, P. T. Surukuchi, A. B. Telles, M. A. Tyra, R. L. Varner, B. Viren, C. White, J. Wilhelmi, T. Wise, M. Yeh, Y.-R. Yen, A. Zhang, C. Zhang, X. Zhang
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Abstract:This Letter reports the first measurement of the $^{235}$U $\overline{\nu_{e}}$ energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9m from the 85MW$_{\mathrm{th}}$ highly-enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678$\pm$304 (stat.) $\overline{\nu_{e}}$-induced inverse beta decays (IBD), the largest sample from HEU fission to date, 99% of which are attributed to $^{235}$U. Despite broad agreement, comparison of the Huber $^{235}$U model to the measured spectrum produces a $\chi^2/ndf = 51.4/31$, driven primarily by deviations in two localized energy regions. The measured $^{235}$U spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the $\overline{\nu_{e}}$ energy region of 5-7MeV.
Subjects: Nuclear Experiment (nucl-ex); High Energy Physics - Experiment (hep-ex); Instrumentation and Detectors (physics.ins-det)
Cite as: arXiv:1812.10877 [nucl-ex]
  (or arXiv:1812.10877v2 [nucl-ex] for this version)
  https://doi.org/10.48550/arXiv.1812.10877
Journal reference: Phys. Rev. Lett. 122, 251801 (2019)
Related DOI: https://doi.org/10.1103/PhysRevLett.122.251801

Submission history

From: Thomas Langford [view email]
[v1] Fri, 28 Dec 2018 02:59:56 UTC (265 KB)
[v2] Fri, 28 Jun 2019 17:33:21 UTC (355 KB)
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