arXiv 1903.061922019-03nucl-th

含禁戒跃迁反应堆反中微子能谱的自洽计算

Self-consistent calculation of the reactor antineutrino spectra including forbidden transitions

J. Petković, T. Marketin, G. Martínez-Pinedo, N. Paar

备注：: 10 pages, 4 figures
DOI：: 10.1088/1361-6471/ab28f5

摘要：

为了确定$θ_{13}$中微子振荡混合角，在美国的双原子核实验装置、美国的RENO实验装置和大亚湾核实验装置上对反应堆反中微子通量进行了测量，发现了观测到的事件数与理论期望值之间的系统性差异。在\emph{ab initio}方法中，总反应堆反中微子谱是由反应堆堆芯中所有裂变产物的所有$β$分支产生的谱的加权和。在所有三个设施中，观察到的事件数量与预测的事件数量存在系统性偏差，即，大约6%的预测中微子没有被观测到。这种差异被命名为反应堆中微子异常。在理论研究中，假设所有的衰变在形状上都是允许的，但是四分之一的跃迁实际上是禁止的，并且可能具有复杂的能量依赖性，这将影响总的反应堆反中微子谱。为了估计禁戒跃迁的影响，我们进行了一个完全自洽的计算光谱从所有贡献的过渡和比较的结果与一个纯粹的允许近似。

英文摘要：

With the goal of determining the $θ_{13}$ neutrino oscillation mixing angle, the measurements of reactor antineutrino fluxes at the Double Chooz, RENO and Daya Bay experimental facilities have uncovered a systematic discrepancy between the number of observed events and theoretical expectations. In the \emph{ab initio} approach, the total reactor antineutrino spectrum is a weighted sum of spectra resulting from all $β$ branches of all fission products in the reactor core. At all three facilities a systematic deviation of the number of observed events from the number of predicted events was noticed, i.e., approximately 6\% of the predicted neutrinos were not observed. This discrepancy was named the reactor neutrino anomaly. In theoretical studies it is assumed that all the decays are allowed in shape, but a quarter of all transitions are actually forbidden and may have a complex energy dependence that will affect the total reactor antineutrino spectrum. In order to estimate the effect of forbidden transitions, we perform a fully self-consistent calculation of spectra from all contributing transitions and compare the results with a purely allowed approximation.

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英文摘要：

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