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T: Fachverband Teilchenphysik

T 106: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 1

T 106.1: Gruppenbericht

Montag, 27. Februar 2012, 16:45–17:05, ZHG 102

The Double Chooz Experiment — •Hideki Watanabe — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Double Chooz is a reactor neutrino experiment that aims at a precise measurement of the last unknown neutrino mixing angle θ₁₃. This is conducted by investigating a deficit of electron anti-neutrinos from EDF Chooz nuclear power station in France. Observation of θ₁₃ is moreover important since this value impacts a feasibility to make a future measurement of the leptonic CP violation parameter. The 1 km baseline experiment with reactor neutrinos is advantageous in that this leads to a simple 2 flavor neutrino oscillation formalism, where the clean measurement of θ₁₃ is achievable. To fulfill precisely a θ₁₃ observation, reduction of possible uncertainties and suppression of backgrounds are required. Double Chooz utilizes various techniques for these aspects including two identical detectors at different baselines with each composed of four-layer liquid structure. The goal of Double Chooz is to measure sin²(2θ₁₃) with a sensitivity of 0.03 at 90 % confidence level. The construction of the Double Chooz far detector was successfully completed that is placed at 1 km baseline, and its physics data-taking was started in spring, 2011. In this talk, the experimental concept, results of the first neutrino oscillation analysis, and future prospects of Double Chooz will be presented.