Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 102: Niederenergie-Neutrinophysik III

T 102.1: Gruppenbericht

Donnerstag, 3. März 2016, 16:45–17:05, VMP9 SR 07

Latest results from the Double Chooz experiment — •Marianne Göger-Neff for the Double Chooz collaboration — Physik Department E15, Technische Universität München

Double Chooz aims at a precise measurement of the neutrino mixing angle θ₁₃ through the disappearance of reactor electron antineutrinos. The experiment relies on the measurement of neutrino flux and spectrum with two identical detectors at 400 m and 1000 m from the reactor cores of two nuclear power reactors. ν_e are detected by inverse beta decay on free protons in 8.3 tons of Gd-loaded liquid scintillator, providing a unique delayed coincidence signature. Double Chooz has been running since 2011 with the far detector only, providing the first indication for non-zero θ₁₃ with reactor antineutrinos. With a rate+shape analysis of 467.90 live days from 2011 - 2013 we obtain a value of sin² 2 θ₁₃ = 0.090_−0.029^+0.032. Data taking with the near detector has started beginning of 2015, allowing a significant reduction of both reactor and detector related systematic uncertainties. The talk will review the most recent results obtained with the far detector only and discuss first data from the near detector.

This work was supported by the DFG (GO 1729/1-1).