Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Neutrinophysik I

T 8.4: Group Report

Monday, March 25, 2019, 17:00–17:20, S06

New Results from the Double Chooz Experiment — •Philipp Soldin for the Double Chooz collaboration — III. Physikalisches Institut B, RWTH Aachen University

Double Chooz is a reactor neutrino disappearance experiment that has been operating between 2011 until the end of 2017. Its main purpose has been a precise measurement of the neutrino mixing angle θ₁₃. The experimental setup consisted of two identical liquid scintillator detectors at average baselines of about 400 m and 1 km to two reactor cores at the nuclear power plant in Chooz, France. The neutrinos were detected by measuring the signature of the inverse beta decay (IBD), which consists of a prompt positron- and a delayed neutron capture signal. The double detector setup with an essential iso flux configuration under consideration of all neutrino rates, energy spectral shapes and all relevant backgrounds allows a fit to obtain the neutrino mixing angle θ₁₃. Statistical uncertainties are further reduces by adding the delayed signal of the Hydrogen neutron capture in addition to the Gadolinium, which yields an increase of more than a factor two in statistics. Unique techniques for the selection of antineutrino events and background discrimination and the development of a multivariate, highly parallel fit to the prediction are shown, and the observed spectral distortions are discussed in this talk.