Determination of the Leptonic Mixing Angle Theta-13 with the Double Chooz Experiment

双选择实验测定轻子混合角Theta-13

• 批准号: 39031316
• 负责人: Professor Dr. Christopher Wiebusch
• 金额: --
• 依托单位: III. Physikalisches Institut B - Elementarteilchenphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/39031316?language=en
• 关键词: Determination; Leptonic; Mixing; Angle; Theta

The main goal of the Double Chooz experiment is the measurement of flavor oscillations of anti-electron neutrinos. The experimental setup consists of two nearly identical detectors that measure the flux of anti-electron neutrinos at different distances from the two reactor cores at the Chooz nuclear power plant in France. The experiment is optimized for measuring the disappearance of reactor neutrinos related to the leptonic mixing angle Theta-13 but it is also sensitive to additional oscillation modes related to hypothetical sterile neutrinos. The Double Chooz collaboration has successfully pioneered the experimental concept of using identical near and far detectors minimizing systematic uncertainties. Upon start of the project in 2006, it was unclear, if the effect existed and could be measured. Meanwhile Theta-13 is the neutrino mixing angle that has been measured with the smallest relative error, also because of results from Double Chooz. With one far detector, Double Chooz started operation in 2011, The second, near, detector of Double Chooz has been commissioned early 2015 and the experiment operated in its full configuration until 2018. Our group at RWTH Aachen has been funded by the DFG since 2007. We have significantly contributed to the construction and operation of Double Chooz, and to the data analysis, particularly the previous measurements of Theta-13. We have provided about 15% of the photomultipliers of both inner detectors and have developed the trigger system and additional components of the data acquisition system, which has been working very reliably at essentially 100% efficiency during all phases of detector operation. The analysis of the experimental data is still ongoing. Goal of this proposal is the production of a final result for the measurement of Theta-13, and additionally a final result for the search for sterile neutrinos. The determination of Theta-13 will be ultimately limited by systematic uncertainties and thus we are aiming for minimizing these errors for the final result. The Double Chooz experiment has several unique advantages in this direction: The two detectors are positioned such that the relative flux contribution from the two reactors is similar for both detectors. Furthermore, during phases when reactors are stopped, backgrounds can be precisely measured. Therefore, we expect that the result of Double Chooz will significantly contribute to the global knowledge of the value Theta-13 for many years. The uncertainty of Theta-13 is of critical importance to the field of neutrino oscillations, because it is an input to other measurements such as the measurement of the neutrino mass hierarchy, CP violation in the lepton sector and tests of the unitarity of the PMNS matrix.

双中微子实验的主要目标是测量反电子中微子的味振荡。该实验装置由两个几乎相同的探测器组成，它们测量了距离法国埃因霍温核电站两个反应堆堆芯不同距离的反电子中微子通量。 该实验是优化测量反应堆中微子的消失有关轻子混合角θ-13，但它也是敏感的额外的振荡模式有关的假设无菌中微子。Double Doppler合作成功地开创了使用相同的近距离和远距离探测器的实验概念，最大限度地减少了系统的不确定性。 在2006年项目开始时，尚不清楚是否存在影响，是否可以衡量。 与此同时，θ-13是中微子混合角的最小相对误差，这也是由于双π z的结果。2011年，双探测器开始运行，第二个近探测器已于2015年初投入使用，并在2018年之前以其完整配置运行。 我们在亚琛工业大学的团队自2007年以来一直由DFG资助。我们为双极望远镜的建造和运行以及数据分析做出了重大贡献，特别是之前对Theta-13的测量。我们提供了两个内部探测器的大约15%的光电倍增管，并开发了触发系统和数据采集系统的附加组件，该系统在探测器操作的所有阶段都以基本上100%的效率非常可靠地工作。 实验数据的分析仍在进行中。该计划的目标是产生测量Theta-13的最终结果，以及寻找无菌中微子的最终结果。Theta-13的确定最终将受到系统不确定性的限制，因此我们的目标是最大限度地减少最终结果的这些误差。在这个方向上，双中子实验有几个独特的优势：两个探测器的位置使得两个反应堆的相对通量贡献对于两个探测器是相似的。此外，在反应堆停止的阶段，可以精确地测量背景。 因此，我们预计双θ z的结果将大大有助于多年来对θ-13值的全球知识。Theta-13的不确定性对中微子振荡领域至关重要，因为它是其他测量的输入，例如中微子质量等级的测量，轻子扇区的CP破坏和PMNS矩阵的幺正性测试。