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First-forbidden transitions in the reactor anomaly

机译:反应堆异常中的第一禁止过渡

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We describe here microscopic calculations performed on the dominant forbidden transitions in reactor antineutrino spectra above 4 MeV using the nuclear shell model. By taking into account Coulomb corrections in the most complete way, we calculate the shape factor with the highest fidelity and show strong deviations from allowed approximations and previously published results. Despite small differences in the ab initio electron cumulative spectra, large differences on the order of several percent are found in the antineutrino spectra. Based on the behavior of the numerically calculated shape factors we propose a parametrization of forbidden spectra. Using Monte Carlo techniques we derive an estimated spectral correction and uncertainty due to forbidden transitions. We establish the dominance and importance of forbidden transitions in both the reactor anomaly and spectral shoulder analysis with their respective uncertainties. Based on these results, we conclude that a correct treatment of forbidden transitions is indispensable in both the normalization anomaly and spectral shoulder.
机译:这里我们描述了使用核壳模型在4MeV以上的反应器抗内氨基谱的主导禁止转变进行的显微计算。通过以最完整的方式考虑库仑校正,我们计算具有最高保真度的形状因子,并显示出与允许的近似和先前公布的结果的强偏差。尽管AB Initio电子累积光谱具有很小差异,但在抗内丁诺谱中发现了几个百分之百分比的大差异。基于数值计算形状因素的行为,我们提出了禁区的参数化。使用Monte Carlo技术我们由于禁止的转换而导致估计的光谱校正和不确定性。我们建立了反应堆异常和光谱肩部分析的禁止转变的优势和重要性,其各自的不确定性。基于这些结果,我们得出结论,在归一化异常和光谱肩部中,对禁止过渡的正确治疗是必不可少的。

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