2014/06/30 by Y. Abe, J. C. dos Anjos, J. C. Barriere +145 · 191 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Detector #Energy (signal processing) #Mixing (physics) #Neutrino #Neutrino Physics Research #Radioactive Decay and Measurement Techniques #Robustness (evolution) #Systematic error #hep-ex #physics.ins-det
paper · pdf · doi:10.1007/jhep10(2014)086
published in Journal of High Energy Physics 2014(10) (Springer Nature) · 44 pages, 25 figures. Figures 21 and 22 have been replaced (statistical error bars for bins above 8 MeV have become smaller). No other changes in the results of the paper; an Erratum submitted to JHEP
openalex publication_date 2014/10/01 · arxiv created 2015/01/21 · arxiv updated 2015/03/03 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/06
The Double Chooz experiment presents improved measurements of the neutrino mixing angle θ 13 using the data collected in 467.90 live days from a detector positioned at an average distance of 1050 m from two reactor cores at the Chooz nuclear power plant. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties with respect to previous publications, whereas the efficiency of the νe signal has increased. The value of θ 13 is measured to be sin2 2θ 13 = 0.090 − 0.029 + 0.032 from a fit to the observed energy spectrum. Deviations from the reactor νe prediction observed above a prompt signal energy of 4 MeV and possible explanations are also reported. A consistent value of θ 13 is obtained from a fit to the observed rate as a function of the reactor power independently of the spectrum shape and background estimation, demonstrating the robustness of the θ 13 measurement despite the observed distortion.