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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.
Physical review letters, 06/2019, Letnik: 122, Številka: 25Journal Article
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 MWth 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.
