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T: Fachverband Teilchenphysik

T 93: Neutrino physics without accelerators IV

T 93.6: Vortrag

Donnerstag, 18. März 2021, 17:15–17:30, Tr

Measurement of the neutrino mixing angle θ₁₃ with the Double Chooz experiment — •Philipp Soldin, Markus Bachlechner, Lars Heuermann, Achim Stahl, and Christopher Wiebusch — RWTH Aachen University - Physics Institute III B, Aachen, Germany

Double Chooz is a reactor neutrino disappearance experiment that was operating between 2011 until the end of 2017. Its main purpose was the 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 nuclear reactor cores in Chooz, France. The neutrinos were detected by measuring the signature of the inverse beta decay (IBD), which consists of a prompt positron annihilation and a delayed neutron capture signal. We perform a measurement of θ₁₃ using a Poisson based likelihood fit of the energy dependent flux of the two detectors. This requires the consideration of the simultaneous measurement of the energy dependent neutrino rates in two detectors, all relevant backgrounds and systematic uncertainties, resulting in more than 300 partly correlated model parameters. In this talk we present the challenging fit method and the experimental result from the full data set of Double Chooz.