论文标题
衰减的热量测量值可以告诉我们有关反应器抗神经异常的信息吗？
Can decay heat measurements tell us something about the Reactor Antineutrino Anomaly?
论文作者
论文摘要
在$^{235} $ U和$^{239,241} $ pu上热中子引起的裂变后，释放的衰减能量的测量值是在1970年代在橡树岭国家实验室进行的，目的是量化静置事故现象的可能损失。这种衰变能量在技术阶段称为衰减热，主要由两个术语组成，这些术语是在富含中子的裂变产物的β-Minus衰减中产生的电子，以及随后激发核水平的后续衰减中产生的伽马群的β-Minus衰变。在这项工作中，我们研究了这套广泛的衰减热测量值是否可以用于评估反应器抗神经异常，即，核反应堆产生的电子抗瑞氏疗中的电子反应器的赤字大约为5 \％，最初是由提及和合作者在2011年推出的，并由主要的反应器抗反应器实验室观察到。在核数据库的协助下，我们能够在平衡条件下以$^{235} $ U到$^{239} $ PU获得电子光谱的比率，这与Kopeikin and Consarinators最近报道的较低趋势更好地一致$^{239} $ pu，与1980年代在Insitut Laue-Langevin中测量的$ pu一致。我们得出的结论是，需要一项新的实验运动来利用高分辨率和信噪比电子光谱仪和高度精确的裂变归一化过程来测量电子光谱。
Measurements of the decay energy released as a function of time following the thermal neutron induced fission on $^{235}$U and $^{239,241}$Pu were performed in the 1970s at Oak Ridge National Laboratory with the purpose of quantifying possible Loss Of Coolant Accident scenarios. This decay energy, known in technical parlance as decay heat, is mainly composed of two terms, that of the electrons produced together with antineutrinos in the beta-minus decay of the neutron-rich fission products, and that of the gammas produced in the subsequent decay of excited nuclear levels. In this work we study if this extensive set of decay heat measurements can be used to assess the Reactor Antineutrino Anomaly, that is, the approximately 5\% deficit of electron antineutrinos produced by nuclear reactors, first deduced by Mention and collaborators in 2011, and observed by the major reactor antineutrino experiments near nuclear power plants since. With the assistance of nuclear databases, we are able to obtain the ratio of electron spectra under equilibrium conditions for $^{235}$U to $^{239}$Pu, in better agreement with the lower trend recently reported by Kopeikin and collaborators, as well as those for $^{235}$U to $^{241}$Pu and $^{241}$Pu to $^{239}$Pu, which do not agree well with those measured at the Insitut Laue-Langevin in the 1980s. We conclude that a new experimental campaign is needed to measure the electron spectra utilizing a high-resolution and signal-to-noise-ratio electron spectrometer and a highly precise fission normalization procedure.
