利用高通量同位素反应堆（HFIR）的PROSPECT-I探测器对235U反中微子能谱进行的最终测量。

Final Measurement of the ^{235}U Antineutrino Energy Spectrum with the PROSPECT-I Detector at HFIR.

作者信息

Andriamirado M, Balantekin A B, Bass C D, Bergeron D E, Bernard E P, Bowden N S, Bryan C D, Carr R, Classen T, Conant A J, Deichert G, Delgado A, Diwan M V, Dolinski M J, Erickson A, Foust B T, Gaison J K, Galindo-Uribari A, Gilbert C E, Gokhale S, Grant C, Hans S, Hansell A B, Heeger K M, Heffron B, Jaffe D E, Jayakumar S, Ji X, Jones D C, Koblanski J, Kunkle P, Kyzylova O, LaBelle D, Lane C E, Langford T J, LaRosa J, Littlejohn B R, Lu X, Maricic J, Mendenhall M P, Meyer A M, Milincic R, Mueller P E, Mumm H P, Napolitano J, Neilson R, Nikkel J A, Nour S, Palomino Gallo J L, Pushin D A, Qian X, Roca C, Rosero R, Searles M, Surukuchi P T, Sutanto F, Tyra M A, Venegas-Vargas D, Weatherly P B, Wilhelmi J, Woolverton A, Yeh M, Zhang C, Zhang X

机构信息

Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA.

Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.

出版信息

Phys Rev Lett. 2023 Jul 14;131(2):021802. doi: 10.1103/PhysRevLett.131.021802.

DOI:10.1103/PhysRevLett.131.021802

PMID:37505961

Abstract

This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely ^{235}U-fueled reactor, made with the final dataset from the PROSPECT-I detector at the High Flux Isotope Reactor. By extracting information from previously unused detector segments, this analysis effectively doubles the statistics of the previous PROSPECT measurement. The reconstructed energy spectrum is unfolded into antineutrino energy and compared with both the Huber-Mueller model and a spectrum from a commercial reactor burning multiple fuel isotopes. A local excess over the model is observed in the 5-7 MeV energy region. Comparison of the PROSPECT results with those from commercial reactors provides new constraints on the origin of this excess, disfavoring at 2.0 and 3.7 standard deviations the hypotheses that antineutrinos from ^{235}U are solely responsible and noncontributors to the excess observed at commercial reactors, respectively.

摘要

本信函报告了迄今为止对纯以²³⁵U为燃料的反应堆中反中微子能谱进行的最精确测量之一，该测量是利用高通量同位素反应堆的PROSPECT - I探测器的最终数据集完成的。通过从先前未使用的探测器部分提取信息，本分析有效地将之前PROSPECT测量的统计数据增加了一倍。重建的能谱被展开为反中微子能量，并与休伯 - 米勒模型以及燃烧多种燃料同位素的商业反应堆的能谱进行比较。在5 - 7兆电子伏特能量区域观察到相对于该模型的局部过剩。将PROSPECT结果与商业反应堆的结果进行比较，为这种过剩的来源提供了新的限制，分别以2.0和3.7个标准差不支持来自²³⁵U的反中微子单独导致商业反应堆中观察到过剩以及对该过剩无贡献的假设。