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Prédiction des taux de fission des coeurs de Chooz et estimation des incertitudes associées dans le cadre de l'expérience Double Chooz

Abstract : The Double Chooz experiment is designed to search for a non-vanishing mixing angle θ₁₃ characterizing the ability of neutrinos to oscillate. It consists in two identical detectors located respectively at 400 m and 1050 m of the two pressurized water reactors of the Chooz nuclear plant in the French Ardennes. Indeed, nuclear reactor are huge electron antineutrino emitters (about 10²¹ ⊽ₑ/s for a 1GWe reactor). In Double Chooz, antineutrino sare detected by the inverse beta decay process in the liquid scintillator of the detectors : ⊽ₑ + p −> e⁺ + n. The θ₁₃ parameter can be investigated searching for ⊽ₑ disappearance and ⊽ₑ energy distortion in the far detector with respect to the near detector. The first phase of the experiment during which only the far detector is taking data has started in April 2011. In absence of far detector whose installation will be completed in 2014, a prediction of the non-oscillated antineutrino flux and spectrum shape expected in the far detector is mandatory to measure θ₁₃ . In this manuscript, we present the simulation work performed to predict the fission rates of both Chooz cores responsible for the reactor antineutrino flux. In this view, a complete core model has been developed with the MCNP Utility for Reactor Evolution (MURE) simulation code. The results of these simulations were used to determine the fission rates and associated systematic errors since the beginning of data taking and led to the first indication for a non-zero θ₁₃ mixing angle in November 2011.
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https://tel.archives-ouvertes.fr/tel-01082405
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Submitted on : Thursday, November 13, 2014 - 2:23:06 PM
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Anthony Onillon. Prédiction des taux de fission des coeurs de Chooz et estimation des incertitudes associées dans le cadre de l'expérience Double Chooz. Physique Nucléaire Théorique [nucl-th]. Ecole des Mines de Nantes, 2014. Français. ⟨NNT : 2014EMNA0116⟩. ⟨tel-01082405⟩

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