Double Chooz 中双探测器反应堆速率调制振荡分析
高能物理 - 实验
2021-02-09 v2 仪器与探测器
摘要
提出了一种基于 Double Chooz 远、近探测器在不同反应堆功率条件下观测到的反中微子速率的 振荡分析。该方法提供了迄今为止独特的 与总本底速率的同时确定，且不依赖于任何关于具体本底贡献的假设。该分析包含两探测器中收集的 865 天数据，期间至少有一个反应堆在运行。远（近）探测器中 24.06 天（12.74 天）反应堆关闭数据的使用增强了振荡结果。分析考虑可见能量 up to 8.5 MeV 的 \nue 相互作用，利用更高能量的事件建立考虑快中子相互作用和 Li 衰变的宇宙成因本底模型。与本底模型无关的混合角确定为 sin，其最佳拟合总本底速率与宇宙成因本底模型完全一致。还进行了第二次振荡分析，将总本底速率约束为宇宙成因本底估计值。由于反应堆关闭数据与本底估计之间的一致性，中心值未被显著修改，而本底模型的加入将 的不确定性减小到 0.015。连同振荡结果，反中微子速率的归一化以 0.86\% 的精度测量，减小了与预期相关的 1.43\% 不确定性。
引用
@article{arxiv.2007.13431,
title = {Reactor Rate Modulation oscillation analysis with two detectors in Double Chooz},
author = {Double Chooz Collaboration and T. Abrahão and H. Almazan and J. C. dos Anjos and S. Appel and I. Bekman and T. J. C. Bezerra and L. Bezrukov and E. Blucher and T. Brugière and C. Buck and J. Busenitz and A. Cabrera and M. Cerrada and E. Chauveau and P. Chimenti and J. V. Dawson and Z. Djurcic and A. Etenko and H. Furuta and I. Gil-Botella and L. F. G. Gonzalez and M. C. Goodman and T. Hara and D. Hellwig and A. Hourlier and M. Ishitsuka and J. Jochum and C. Jollet and K. Kale and M. Kaneda and T. Kawasaki and E. Kemp and H. de Kerret and D. Kryn and M. Kuze and T. Lachenmaier and C. E. Lane and T. Lasserre and C. Lastoria and D. Lhuillier and H. P. Lima and M. Lindner and J. M. López-Castaño and J. M. LoSecco and B. Lubsandorzhiev and J. Maeda and C. Mariani and J. Maricic and J. Martino and T. Matsubara and G. Mention and A. Meregaglia and T. Miletic and R. Milincic and A. Minotti and D. Navas-Nicolás and P. Novella and L. Oberauer and M. Obolensky and A. Onillon and A. Oralbaev and C. Palomares and I. M. Pepe and G. Pronost and J. Reichenbacher and B. Reinhold and S. Schönert and S. Schoppmann and R. Sharankova and V. Sibille and V. Sinev and M. Skorokhvatov and P. Soldin and A. Stahl and I. Stancu and L. F. F. Stokes and F. Suekane and S. Sukhotin and T. Sumiyoshi and Y. Sun and B. Viaud and M. Vivier and S. Wagner and C. Wiebusch and G. Yang and F. Yermia},
journal= {arXiv preprint arXiv:2007.13431},
year = {2021}
}