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Measuring the antineutrino spectrum at the Daya Bay nuclear reactors.

机译:测量大亚湾核反应堆的反中微子谱。

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摘要

The Daya Bay Reactor Antineutrino Experiment is a multi-detector oscillation experiment that has used antineutrinos produced at the Guangdong and Ling Ao nuclear reactors in Southern China to measure the neutrino mixing angle sin22θ13 and the mass-splitting Dm2ee . Between December 24, 2011 and July 28, 2012, the experiment collected 338310 candidate inverse beta decay events with six, 20-ton detectors placed at varying distances from the reactor cores. This work calculates the expected antineutrino flux and spectrum at all Daya Bay detectors from models of the reactor spectrum and compares the predictions to the observation to evaluate their consistency. This is of interest because of an apparent deficit, the "reactor neutrino anomaly," noted in 2011 between measured antineutrino fluxes and the most recent reactor flux model predictions. In this work, we find an excess of events in the 5 MeV region of the observed spectrum. It is demonstrated that this excess is inconsistent with the commonly used reactor models, and does not appear to be consistent with the detector response. The cause of the excess has not been determined, but some avenues of further investigation are discussed. Additionally, we verify that in a three-neutrino oscillation picture with the current detector response model, Daya Bay's oscillation results are independent of the underlying reactor model.
机译:大亚湾反应堆反中微子实验是一个多探测器振荡实验,它使用了在中国南方的广东和岭澳核反应堆生产的反中微子来测量中微子的混合角sin22θ13和质量分裂Dm2ee。在2011年12月24日至2012年7月28日之间,该实验收集了338310个候选beta逆向衰变事件,其中六个,20吨重的探测器距反应堆堆芯的距离不同。这项工作根据反应堆光谱模型计算了所有大亚湾探测器的预期抗中微子通量和光谱,并将预测结果与观测结果进行比较以评估其一致性。之所以感兴趣,是因为在2011年,在测量到的反中微子通量和最新的反应堆通量模型预测之间发现了明显的缺陷,即“反应堆中微子异常”。在这项工作中,我们在观察到的光谱的5 MeV区域发现了过多的事件。结果表明,这种过量与常用的反应堆模型不一致,并且似乎与检测器的响应不一致。过量的原因尚未确定,但讨论了进一步调查的一些途径。此外,我们验证了在具有当前探测器响应模型的三中微子振荡图中,大亚湾的振荡结果与基础反应堆模型无关。

著录项

  • 作者

    Lewis, Christine A.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 166 p.
  • 总页数 166
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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