论文标题
在HFIR处使用前景-I检测器的U235抗神经能量光谱的最终测量
Final Measurement of the U235 Antineutrino Energy Spectrum with the PROSPECT-I Detector at HFIR
论文作者
论文摘要
这封信报告了纯粹的U235燃料反应器迄今为止，在高通量同位素反应器的最终数据集中，纯U235燃料反应器的抗肿瘤光谱的最精确测量之一。通过从先前未使用的检测器段中提取信息，该分析有效地使前期前景测量的统计数据增加了一倍。重建的能源光谱被展开为抗肿瘤的能量，并与Huber-Mueller模型和来自燃烧多个燃料同位素的商用反应器的光谱进行了比较。在5MEV到7MEV能量区域中观察到了超过模型的局部过量。将前景结果与商业反应堆的前景结果进行比较提供了对这种过量的起源的新限制，在2.2和3.2标准偏差下，U235的抗神经替代物在2.2和3.2标准偏差下是对商业反应堆分别观察到的过量构成的假设。
This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely U235-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 5MeV to 7MeV energy region. Comparison of the PROSPECT results with those from commercial reactors provides new constraints on the origin of this excess, disfavoring at 2.2 and 3.2 standard deviations the hypotheses that antineutrinos from U235 are solely responsible and non-contributors to the excess observed at commercial reactors respectively.
