论文标题
改进了Daya湾反应堆抗毒剂通量和光谱的演变的测量
Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
论文作者
论文摘要
反应堆中微子实验在促进我们对中微子的知识方面起着至关重要的作用。对反应堆电子抗肿瘤通量和频谱进化的精确测量可能是改善中微子质量和混合以及反应堆核物理学以及超越标准模型以外的物理学的关键输入。在这项工作中，报告了Daya Bay的逆-beta-decay收益率，其数据的变化与反应堆同位素含量的函数报告了1958天的数据并改善了系统的不确定性。将这些测量结果与两个签名模型预测进行了比较：基于转换方法的Huber-Mueller模型和基于Sumpation方法的SM2018模型。测得的平均通量和频谱以及它们与239PU分数的演变与Huber-Mueller模型的预测不一致。相反，SM2018模型被证明与平均通量及其演变一致，但无法描述能量谱。从239PU中更改预测的IBD频谱并不能改善与任何两种模型的测量的一致性。如果更改了235U或预测的235U，238U，239PU和241PU光谱，则可以使模型与测量结果更好地吻合。
Reactor neutrino experiments play a crucial role in advancing our knowledge of neutrinos. A precise measurement of reactor electron antineutrino flux and spectrum evolution can be key inputs in improving the knowledge of neutrino mass and mixing as well as reactor nuclear physics and searching for physics beyond the standard model. In this work, the evolution of the flux and spectrum as a function of the reactor isotopic content is reported in terms of the inverse-beta-decay yield at Daya Bay with 1958 days of data and improved systematic uncertainties. These measurements are compared with two signature model predictions: the Huber-Mueller model based on the conversion method and the SM2018 model based on the summation method. The measured average flux and spectrum, as well as their evolution with the 239Pu fraction, are inconsistent with the predictions of the Huber-Mueller model. In contrast, the SM2018 model is shown to agree with the average flux and its evolution but fails to describe the energy spectrum. Altering the predicted IBD spectrum from 239Pu does not improve the agreement with the measurement for either model. The models can be brought into better agreement with the measurements if either the predicted spectrum due to 235U is changed or the predicted 235U, 238U, 239Pu, and 241Pu spectra are changed in equal measure.
