Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 48: Neutrino Physics without Accelerators 3

T 48.1: Vortrag

Dienstag, 22. März 2022, 16:15–16:30, T-H33

Improved measurement of the neutrino mixing angle θ₁₃ with Double Chooz — •Philipp Soldin, Lars Heuermann, Achim Stahl, and Christopher Wiebusch — III. Physics Institute B, RWTH Aachen University

Double Chooz is a reactor neutrino disappearance experiment that was operating between 2011 until 2018. Its primary 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 inverse beta decay (IBD) signature, which consists of a prompt positron annihilation and a delayed neutron capture signal. The simultaneous measurement of the neutrino energy spectra with two detectors is used in a Poisson-based likelihood fit to obtain the neutrino mixing angle θ₁₃. This fit takes into account the respective neutrino fluxes, their energy spectra, all relevant backgrounds, and correlated uncertainties. The final data set, latest results, and novel ideas are presented in this talk.