Current predictions for the antineutrino yield and spectra from a nuclear reactor rely on the experimental electron spectra from ${}^{235}\mathrm{U}$, ${}^{239}\mathrm{Pu}$, ${}^{241}\mathrm{Pu}$ and a numerical method to convert these aggregate electron spectra into their corresponding antineutrino ones. In the present work we investigate quantitatively some of the basic assumptions and approximations used in the conversion method, studying first the compatibility between two recent approaches for calculating electron and antineutrino spectra. We then explore different possibilities for the disagreement between the measured Daya Bay and the Huber-Mueller antineutrino spectra, including the ${}^{238}\mathrm{U}$ contribution as well as the effective charge and the allowed shape assumption used in the conversion method. We observe that including a shape correction of about $+6\%{\mathrm{MeV}}^{-1}$ in conversion calculations can better describe the Daya Bay spectrum. Because of a lack of experimental data, this correction cannot be ruled out, concluding that in order to confirm the existence of the reactor neutrino anomaly, or even quantify it, precisely measured electron spectra for about 50 relevant fission products are needed. With the advent of new rare ion facilities, the measurement of shape factors for these nuclides, for many of which precise beta intensity data from TAGS experiments already exist, would be highly desirable.

中文翻译：

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剖析反应堆抗中微子通量的计算

目前对核反应堆中微子产量和光谱的预测依赖于来自核反应堆的实验电子光谱 ${}^{235}\mathrm{ü}$， ${}^{239}普$， ${}^{241}普$以及一种将这些聚集电子光谱转换为相应的中微子光谱的数值方法。在本工作中，我们定量研究转换方法中使用的一些基本假设和近似值，首先研究计算电子和反中微子光谱的两种最新方法之间的兼容性。然后，我们针对测得的大亚湾与Huber-Mueller反中微子光谱之间的分歧探索不同的可能性，包括${}^{238}\mathrm{ü}$贡献，有效电荷和转换方法中使用的允许形状假设。我们观察到，包括大约的形状校正$+6％{\mathrm{电动汽车}}^{-\mathrm{1个}}$在转换计算中可以更好地描述大亚湾的光谱。由于缺乏实验数据，无法排除这种校正，因此得出结论，为了确认反应堆中微子异常的存在，甚至量化它，需要精确测量约50种相关裂变产物的电子光谱。随着新的稀有离子设备的出现，非常需要测量这些核素的形状因子，对于其中许多这样的核素，已经存在来自TAGS实验的精确β强度数据。