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

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arxiv 1812.10877 v2 pith:LSRVUO2X submitted 2018-12-28 nucl-ex hep-exphysics.ins-det

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

PROSPECT Collaboration , J. Ashenfelter , A. B. Balantekin , H. R. Band , C. D. Bass , D. E. Bergeron , D. Berish , N. S. Bowden
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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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classification nucl-ex hep-exphysics.ins-det
keywords spectrumenergyoverlineprospectfissionmeasuredmeasurementobserved
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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.

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