Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup.
Analysis of the Daya Bay Reactor Antineutrino Flux Changes with Fuel Burnup.
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DOI：
10.1103/physrevlett.120.022503
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发表时间：
2017-07
影响因子：
8.6
通讯作者：
A. Hayes;G. Jungman;L. McCutchan;A. Sonzogni;G. Garvey;Xiaobao Wang
中科院分区：
文献类型：
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作者：
A. Hayes;G. Jungman;L. McCutchan;A. Sonzogni;G. Garvey;Xiaobao Wang
我们研究了最近在大亚湾取得的反中微子通量和谱随反应堆燃料燃耗变化的结果。我们发现，当前模型预测与大亚湾结果之间的差异可以追溯到最初测量的裂变β光谱的^{235}U/^{239}Pu比值，该比值被用作预期反中微子通量的基础。利用核数据库输入，基于所有裂变碎片β衰变的总和对反中微子光谱进行分析，解释了大亚湾演化数据中看到的所有特征。然而，这种求和方法仍然允许出现异常。我们的结论是，目前没有足够的信息来利用反中微子通量的变化来排除无菌中微子存在的可能性。
We investigate the recent Daya Bay results on the changes in the antineutrino flux and spectrum with the burnup of the reactor fuel. We find that the discrepancy between current model predictions and the Daya Bay results can be traced to the original measured ^{235}U/^{239}Pu ratio of the fission β spectra that were used as a base for the expected antineutrino fluxes. An analysis of the antineutrino spectra that is based on a summation over all fission fragment β decays, using nuclear database input, explains all of the features seen in the Daya Bay evolution data. However, this summation method still allows for an anomaly. We conclude that there is currently not enough information to use the antineutrino flux changes to rule out the possible existence of sterile neutrinos.