Double Chooz: Latest results

Abstract

The latest results from the Double Chooz experiment on the neutrino mixing angle ${\theta }_{13}$ are presented. A detector located at an average distance of 1050 m from the two reactor cores of the Chooz nuclear power plant has accumulated a live time of 467.90 days, corresponding to an exposure of 66.5 GW-ton-year (reactor power $\times$ detector mass $\times$ live time). A revised analysis has boosted the signal efficiency and reduced the backgrounds and systematic uncertainties compared to previous publications, paving the way for the two detector phase. The measured ${\sin }^{2}2{\theta }_{13}=0.090_{-0.029}^{+0.032}$ is extracted from a fit to the energy spectrum. A deviation from the prediction above a visible energy of 4 MeV is found, being consistent with an unaccounted reactor flux effect, which does not affect the ${\theta }_{13}$ result. A consistent value of ${\theta }_{13}$ is measured in a rate-only fit to the number of observed candidates as a function of the reactor power, confirming the robustness of the result.

6 pages, 5 figures, Proceedings of the Neutrino Oscillation Workshop (NOW 2014), Otranto (Italy), September 7-14 2014

References in corpus (2)

• Big-Bang Nucleosynthesis
• Improved measurements of the neutrino mixing angle ${\theta }_{13}$ with the Double Chooz detector

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