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Measurement of the ²³⁵U fission antineutrino spectrum by the STEREO experiment and preparation of the NUCLEUS coherent neutrino scattering experiment

Abstract : The present PhD thesis focuses on the study of antineutrinos emitted by nuclear reactors, with the STEREO and NUCLEUS experiments.STEREO is an experiment exploring the anomalies of reactor antineutrinos physics, consisting of deviations in the shape and rate of the measured antineutrino energy spectrum with respect to the prediction. The experiment investigates the scenario of an oscillation towards a novel sterile state as an explanation of the flux anomaly, while performing a precision measurement of the antineutrino spectrum induced by the fission of ²³⁵U of the Institut Laue-Langevin research reactor core. In this context, my work consisted in constraining the energy scale of the experiment, a prerequisite for an accurate comparison of the measurement with a prediction, and in developing an unfolding framework to provide the reference spectrum free of detector effects. I extended this framework to a joint analysis of STEREO, PROSPECT and Daya-Bay data, to provide reference antineutrino spectra from the fission of uranium and plutonium.The motivation of the NUCLEUS experiment is to study a new neutrino-matter interaction channel, the neutrino-noyau coherent scattering. This experiment will be operated at Chooz nuclear power plant, from 2024 onwards. The moderate expected counting rate for the neutrino signal commands to be able to properly reject background events, with a highly efficient active and passive shielding strategy. I was in charge of the full commissioning of the muon veto prototype that will be used in the experiment to reject the atmospheric muons induced background, typical of ground-level particle physics experiments. I validated the performance of this prototype, allowing to launch the production of the final detector.
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Submitted on : Thursday, November 24, 2022 - 4:48:31 PM
Last modification on : Tuesday, December 6, 2022 - 4:07:04 AM

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  • HAL Id : tel-03870570, version 1

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Rudolph Rogly. Measurement of the ²³⁵U fission antineutrino spectrum by the STEREO experiment and preparation of the NUCLEUS coherent neutrino scattering experiment. High Energy Physics - Experiment [hep-ex]. Université Paris-Saclay, 2022. English. ⟨NNT : 2022UPASP104⟩. ⟨tel-03870570⟩

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