First Double Chooz ${\theta }_{13}$ Measurement via Total Neutron Capture Detection

Abstract

The establishment of the neutrino oscillations phenomenon as a solution to both solar and atmospheric neutrino anomalies had two consequences: a new oscillation mode, labelled ${\theta }_{13}$, and the possibility to observe CP violation, if ${\theta }_{13}$ was sizeable. CP violation implies that neutrino oscillations behave differently for neutrinos and anti-neutrinos -- a rare fundamental phenomenon key for our understanding of the Universe. The experimental demonstration of ${\theta }_{13}$ has aided the completion of a quest lasting half a century. The best ${\theta }_{13}$ knowledge is today inferred from high-precision reactor neutrino disappearance. The Double Chooz (DC) experiment has played a pioneering role in this channel by providing the first positive evidence, in 2011, in combination with the T2K experiment appearance data. The establishment of ${\theta }_{13}$ awaited the Daya Bay experiment's observation in 2012; confirmed soon after by the RENO experiment. Today's best knowledge on ${\theta }_{13}$ from reactor experiments is a key input to many neutrino experiments. Here DC reports its first multi-detector ${\theta }_{13}$ measurement exploiting several unprecedented techniques for a major precision improvement.

17 pages, 11 figures. Nature Physics 2020

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