Dr. Anthony Onillon - Latest Double Chooz results in the multiple detector configuration

par Dr Anthony Onillon

vendredi 17 févr. 2017, 10:45 → 11:45 Europe/Paris

The latest generation of reactor anti-neutrino experiments; Daya Bay, Double Chooz and RENO, have been incredibly successful at finally measuring the smallest mixing angle (θ₁₃) of neutrino oscillation. For this purpose, the Double Chooz experiment is looking for a disappearance of the antineutrinos emitted by the two reactor cores of the Chooz power plant in the French Ardennes using two identical detectors located at different baselines of the cores. For the first phase of the experiment, in which only the far detector was taking data, θ₁₃ was measured by comparing the rate and shape of the far detector data to a prediction of the emitted reactor flux. Since the first hint of θ₁₃ by Double Chooz in 2011, which was larger than expected, the value of sin² (2θ₁₃ ) has been now measured by the three experiments. In 2015, Double Chooz started to take data with both detectors running simultaneously. This new phase, in a multi-detector configuration, allows Double Chooz to strongly improve its precision on θ₁₃ measurement as several mechanisms cancel out part of the dominant systematic uncertainties. The near detector data also allows Double Chooz to make a precise measurement of the rate and shape of the reactor antineutrinos emitted by the cores. In this seminar, I will present the new analysis develop in Double Chooz for the multi-detector configuration. The results on the θ₁₃ measurement as well as those on the shape and rate of the antineutrino measurement in the near detector will be presented. A highlight on results obtained by other reactor based experiments will be also given.

Slides DoubleChooz_IPHCseminar_feb2016.pdf