论文标题
$^{235} $ u触发与立体声检测器的第一个Antinutrino Energy Spectrum
First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL
论文作者
论文摘要
本文报告了通过立体声实验的$^{235} $ U诱导的抗神经光谱的测量。在118次全天候，在标称功率上等效的118天，在距高度富集的核心核心约10 m处检测到43000次抗肿瘤。展开测得的逆β衰变光谱，以提供纯$^{235} $ u频谱。对展开程序的仔细研究，包括独立框架的交叉验证，表明该方法没有引入主要偏见。关于$e_ν\ simeq 5.3 $ meV的预测，发现了重大的局部失真。这种局部多余的高斯拟合会导致$ a = 12.1 \ pm 3.4 \％$（3.5 $σ$）。
This article reports the measurement of the $^{235}$U-induced antineutrino spectrum shape by the STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure $^{235}$U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around $E_ν\simeq 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$σ$).
