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

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

arXiv: Nuclear Experiment（2019）

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摘要

This Letter reports the first measurement of the ^{235}U ν[over ¯]_{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) ν[over ¯]_{e}-induced inverse beta decays, 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 χ^{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 ν[over ¯]_{e} energy region of 5-7 MeV.

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