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The reactor antineutrino anomaly might be explained by the oscillation ofreactor antineutrinos toward a sterile neutrino of eV mass. In order to explorethis hypothesis, the STEREO experiment measures the antineutrino energyspectrum in six different detector cells covering baselines between 9 and 11 mfrom the compact core of the ILL research reactor. In this Letter, results from66 days of reactor turned on and 138 days of reactor turned off are reported. Anovel method to extract the antineutrino rates has been developed based on thedistribution of the pulse shape discrimination parameter. The test of a newoscillation toward a sterile neutrino is performed by comparing ratios ofcells, independent of absolute normalization and of the prediction of thereactor spectrum. The results are found to be compatible with the nulloscillation hypothesis and the best fit of the reactor antineutrino anomaly isexcluded at 97.5\% C.L.

Sterile Neutrino Constraints from the STEREO Experiment with 66 days of Reactor-on Data