Speaker
Description
STEREO is a segmented, Gd-loaded liquid scintillator calorimeter that studied anti-neutrinos produced by the compact, highly $^{235}$U-enriched reactor core of the Institut Laue-Langevin in Grenoble (France). The experiment ran from 2016 to 2020 and was designed to test the light sterile neutrino explanation of the Reactor Antineutrino Anomaly (RAA) by comparing the neutrino energy spectra recorded by its six detector cells, located between 9 and 11 m away from the centre of the reactor core.
In this Poster we present results on the search for oscillations driven by a sterile state using STEREO’s full dataset. We exclude a large fraction of the RAA favoured region in the $\Delta m^2_{41}−\sin^2(2\theta_{ee})$ parameter space, including the RAA best-fit point. We also discuss an alternative, compatible oscillation search analysis of about a third of the total data that uses an analytical detector response model, instead of the Geant4 MC response model employed for the published results. This approach allows for a more straightforward treatment of the response model nuisance parameters.
| Collaboration | The STEREO collaboration |
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