Latest Double Chooz results

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Lasserre, Thierry^1,2

Commissariat À l'Énergie Atomique et Aux Énergies Alternatives, Centre de Saclay, DSM/IRFU, Gif-sur-Yvette

91191, France^1

AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, Paris Cedex 13

75205, France^2

关键词: Electron antineutrinos;    Far detector;    Live time;    Neutrino mixing;    Neutron capture;    Systematic uncertainties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/6/062034/pdf
DOI  :  10.1088/1742-6596/718/6/062034

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

I report the latest results from the Double Chooz experiment on the θ13neutrino mixing angle. Two detectors are located at distances of 400 m and 1050 m from the reactor cores of the Chooz nuclear power station (France) to measure the disappearance of electron antineutrinos. The far detector has been taking data since 2011, accumulating a live time of 467.90 days (66.5 GW-ton-year). In this article we focus on the latest measurement using neutrino-induced neutron capture on hydrogen. A new analysis improved the signal efficiency and reduced the backgrounds and systematic uncertainties, leading to sin22θ13= 0.095+0.039 -0.038. When combined with the Gadolinium-based analysis this leads to sin22θ13 = 0.088+0.33 -0.033. The distortion from the prediction above a visible energy of 4 MeV is confirmed. The near detector started data taking in 2014 and first results shall be reported in 2016.