arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.11210hep-exnucl-ex
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利用HFIR的PROSPECT实验改进短基线中微子振荡搜索和能谱测量

Improved Short-Baseline Neutrino Oscillation Search and Energy Spectrum Measurement with the PROSPECT Experiment at HFIR

M. Andriamirado, A. B. Balantekin, H. R. Band, C. D. Bass, D. E. Bergeron, D. Berish, N. S. Bowden, J. P. Brodsky, C. D. Bryan, T. Classen, A. J. Conant, G. Dei… 展开作者

M. Andriamirado, A. B. Balantekin, H. R. Band, C. D. Bass, D. E. Bergeron, D. Berish, N. S. Bowden, J. P. Brodsky, C. D. Bryan, T. Classen, A. J. Conant, G. Deichert, M. V. Diwan, M. J. Dolinski, A. Erickson, B. T. Foust, J. K. Gaison, A. Galindo-Uribarri, C. E. Gilbert, B. W. Goddard, B. T. Hackett, S. Hans, A. B. Hansell, K. M. Heeger, B. Heffron, D. E. Jaffe, X. Ji, D. C. Jones, O. Kyzylova, C. E. Lane, T. J. Langford, J. LaRosa, B. R. Littlejohn, X. Lu, J. Maricic, M. P. Mendenhall, A. M. Meyer, R. Milincic, I. Mitchell, P. E. Mueller, H. P. Mumm, J. Napolitano, C. Nave, R. Neilson, J. A. Nikkel, D. Norcini, S. Nour, J. L. Palomino, D. A. Pushin, X. Qian, E. Romero-Romero, R. Rosero, P. T. Surukuchi, M. A. Tyra, R. L. Varner, D. Venegas-Vargas, P. B. Weatherly, C. White, J. Wilhelmi, A. Woolverton, M. Yeh, A. Zhang, C. Zhang, X. Zhang

摘要:

本文介绍了美国橡树岭国家实验室高浓缩高通量同位素反应堆(HFIR)PROSPECT实验中无菌中微子振荡和U-235反中微子能谱测量结果。在距85兆瓦高红外线反应堆堆芯中心7.9米的平均基线距离处采集的96个日历日的数据中,PROSPECT探测器观测到了铀235裂变产物的β衰变中产生的反中微子的50,000多次相互作用。通过比较10个反应堆-探测器基线在6.7米和9.2米之间的探测能谱,确定了反中微子振荡到轻无菌中微子的新极限。测量的基线之间的能量谱的差异显示,无菌中微子振荡的反中微子没有统计学意义的指示,不利于反应堆反中微子异常最佳拟合点在2.5 $σ$的置信水平。所报道的U-235反中微子能谱测量显示出与通过测量的U-235 β谱的转换产生的能谱模型的极好的一致性,其中$χ^2$ /DOF为31/31。在2.4 $σ$置信水平下,PROSPECT能够否定U-235反中微子是模型与商业反应堆堆芯获得的数据之间的光谱差异的唯一原因的假设。在2.2 $σ$置信水平下,PROSPECT中与商业岩心实验观察到的数据模型偏差类似的数据模型偏差相对于未观察到的偏差是优选的。

英文摘要:

We present a detailed report on sterile neutrino oscillation and U-235 antineutrino energy spectrum measurement results from the PROSPECT experiment at the highly enriched High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. In 96 calendar days of data taken at an average baseline distance of 7.9 m from the center of the 85 MW HFIR core, the PROSPECT detector has observed more than 50,000 interactions of antineutrinos produced in beta decays of U-235 fission products. New limits on the oscillation of antineutrinos to light sterile neutrinos have been set by comparing the detected energy spectra of ten reactor-detector baselines between 6.7 and 9.2 meters. Measured differences in energy spectra between baselines show no statistically significant indication of antineutrinos to sterile neutrino oscillation and disfavor the Reactor Antineutrino Anomaly best-fit point at the 2.5$σ$ confidence level. The reported U-235 antineutrino energy spectrum measurement shows excellent agreement with energy spectrum models generated via conversion of the measured U-235 beta spectrum, with a $χ^2$/DOF of 31/31. PROSPECT is able to disfavor at 2.4$σ$ confidence level the hypothesis that U-235 antineutrinos are solely responsible for spectrum discrepancies between model and data obtained at commercial reactor cores. A data-model deviation in PROSPECT similar to that observed by commercial core experiments is preferred with respect to no observed deviation, at a 2.2$σ$ confidence level.

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