Aachen 2019 – wissenschaftliches Programm
T 8.4: Gruppenbericht
Montag, 25. März 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.