First result from the Double Chooz reactor-neutrino experiment

2012/05/30 by T. Matsubara, Matsubara, Tsunayuki · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Neutrino Physics Research

paper · pdf · doi:10.48550/arxiv.1205.6685

openalex publication_date 2012/05/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report first results of a search for the non-zero neutrino mixing angle θ₁₃ from the Double Chooz experiment. Double Chooz aims to measure the mixing angle based on anti-electron-neutrino disappearance as a consequence of neutrino oscillation. A new generation of anti-electron-neutrino detector having 10 m³ fiducial volume is located 1 km from the two 4.25 GW_th reactors at the Chooz Power Plant in France. Physics data taking has been continuing since April 2011. A ratio of observed-to-predicted event rate of 0.944 +/- 0.016 (stat) +/- 0.040 (syst) was obtained in 101 days of detector running. Analyzing both the rate and their energy spectral shape, we found sin²2θ₁₃ = 0.086 +/- 0.041 (stat) +/- 0.030 (syst) at Δm²_atm = 2.4 x 10^-3 eV².

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