학술논문
Joint Measurement of the $^{235}$U Antineutrino Spectrum by Prospect and Stereo
Document Type
Working Paper
Author
Almazán, H.; Andriamirado, M.; Balantekin, A. B.; Band, H. R.; Bass, C. D.; Bergeron, D. E.; Bernard, L.; Blanchet, A.; Bonhomme, A.; Bowden, N. S.; Bryan, C. D.; Buck, C.; Classen, T.; Conant, A. J.; Deichert, G.; Sanchez, P. del Amo; Delgado, A.; Diwan, M. V.; Dolinski, M. J.; Atmani, I. El; Erickson, A.; Foust, B. T.; Gaison, J. K.; Galindo-Uribarri, A.; Gilbert, C. E.; Hans, S.; Hansell, A. B.; Heeger, K. M.; Heffron, B.; Jaffe, D. E.; Jayakumar, S.; Ji, X.; Jones, D. C.; Koblanski, J.; Kyzylova, O.; Labit, L.; Lamblin, J.; Lane, C. E.; Langford, T. J.; LaRosa, J.; Letourneau, A.; Lhuillier, D.; Licciardi, M.; Lindner, M.; Littlejohn, B. R.; Lu, X.; Maricic, J.; Materna, T.; Mendenhall, M. P.; Meyer, A. M.; Milincic, R.; Mueller, P. E.; Mumm, H. P.; Napolitano, J.; Neilson, R.; Nikkel, J. A.; Nour, S.; Palomino, J. L.; Pessard, H.; Pushin, D. A.; Qian, X.; Réal, J. -S.; Ricol, J. -S.; Roca, C.; Rogly, R.; Rosero, R.; Salagnac, T.; Savu, V.; Schoppmann, S.; Searles, M.; Sergeyeva, V.; Soldner, T.; Stutz, A.; Surukuchi, P. T.; Tyra, M. A.; Varner, R. L.; Venegas-Vargas, D.; Vialat, M.; Weatherly, P. B.; White, C.; Wilhelmi, J.; Woolverton, A.; Yeh, M.; Zhang, C.; Zhang, X.
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Subject
Language
Abstract
The PROSPECT and STEREO collaborations present a combined measurement of the pure $^{235}$U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with $\chi^2/\mathrm{ndf} = 24.1/21$, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This $\bar{\nu}_e$ energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5-6 MeV region. When a Gaussian bump is fitted to the excess, the data-model $\chi^2$ value is improved, corresponding to a $2.4\sigma$ significance.