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arXiv 2007.13431hep-exphysics.ins-det
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用双探头分析反应堆双稳中的调速振荡

Reactor Rate Modulation oscillation analysis with two detectors in Double Chooz

Double Chooz Collaboration, T. Abrahão, H. Almazan, J. C. dos Anjos, S. Appel, I. Bekman, T. J. C. Bezerra, L. Bezrukov, E. Blucher, T. Brugière, C. Buck, J. Bu… 展开作者

Double Chooz Collaboration, T. Abrahão, H. Almazan, J. C. dos Anjos, S. Appel, I. Bekman, T. J. C. Bezerra, L. Bezrukov, E. Blucher, T. Brugière, C. Buck, J. Busenitz, A. Cabrera, M. Cerrada, E. Chauveau, P. Chimenti, J. V. Dawson, Z. Djurcic, A. Etenko, H. Furuta, I. Gil-Botella, L. F. G. Gonzalez, M. C. Goodman, T. Hara, D. Hellwig, A. Hourlier, M. Ishitsuka, J. Jochum, C. Jollet, K. Kale, M. Kaneda, T. Kawasaki, E. Kemp, H. de Kerret, D. Kryn, M. Kuze, T. Lachenmaier, C. E. Lane, T. Lasserre, C. Lastoria, D. Lhuillier, H. P. Lima, M. Lindner, J. M. López-Castaño, J. M. LoSecco, B. Lubsandorzhiev, J. Maeda, C. Mariani, J. Maricic, J. Martino, T. Matsubara, G. Mention, A. Meregaglia, T. Miletic, R. Milincic, A. Minotti, D. Navas-Nicolás, P. Novella, L. Oberauer, M. Obolensky, A. Onillon, A. Oralbaev, C. Palomares, I. M. Pepe, G. Pronost, J. Reichenbacher, B. Reinhold, S. Schönert, S. Schoppmann, R. Sharankova, V. Sibille, V. Sinev, M. Skorokhvatov, P. Soldin, A. Stahl, I. Stancu, L. F. F. Stokes, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, B. Viaud, M. Vivier, S. Wagner, C. Wiebusch, G. Yang, F. Yermia

摘要:

本文根据在不同反应堆功率条件下,双π z远、近探测器上观测到的反中微子率,对$θ_{13}$振荡进行了分析。这种方法提供了一种迄今为止唯一的同时测定$θ_{13}$和总背景速率的方法,而不依赖于对特定背景贡献的任何假设。分析包括在两个探测器中收集的865天的数据,其中至少有一个反应堆在运行中。在远(近)探测器中使用24.06天(12.74天)的停堆数据增强了振荡结果。分析认为\nue相互作用高达8.5 MeV的可见能量,使用更高能量的事件来建立考虑快中子相互作用和$^{9}$ Li衰变的宇宙成因背景模型。背景模型无关的混合角的确定产生sin $^2(2θ_{13})=0.094\pm0.017$,是与宇宙成因背景模型完全一致的最佳拟合总背景速率。第二个振荡分析也进行约束的总背景率的宇宙成因背景估计。虽然由于停堆数据和背景估计值之间的一致性,中心值没有显著修改,但增加背景模型将$θ_{13}$的不确定性降低至0.015。与振荡结果一起,反中微子率的归一化测量精度为0.86%,降低了与预期相关的1.43%的不确定度。

英文摘要:

A $θ_{13}$ oscillation analysis based on the observed antineutrino rates at the Double Chooz far and near detectors for different reactor power conditions is presented. This approach provides a so far unique simultaneous determination of $θ_{13}$ and the total background rates without relying on any assumptions on the specific background contributions. The analysis comprises 865 days of data collected in both detectors with at least one reactor in operation. The oscillation results are enhanced by the use of 24.06 days (12.74 days) of reactor-off data in the far (near) detector. The analysis considers the \nue interactions up to a visible energy of 8.5 MeV, using the events at higher energies to build a cosmogenic background model considering fast-neutrons interactions and $^{9}$Li decays. The background-model-independent determination of the mixing angle yields sin$^2(2θ_{13})=0.094\pm0.017$, being the best-fit total background rates fully consistent with the cosmogenic background model. A second oscillation analysis is also performed constraining the total background rates to the cosmogenic background estimates. While the central value is not significantly modified due to the consistency between the reactor-off data and the background estimates, the addition of the background model reduces the uncertainty on $θ_{13}$ to 0.015. Along with the oscillation results, the normalization of the anti-neutrino rate is measured with a precision of 0.86\%, reducing the 1.43\% uncertainty associated to the expectation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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