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Approche novatrice de l'évaluation des réactions nucléaires par une modélisation multivoie unificatrice

Abstract : The traditional methodology of nuclear data evaluation, which has been in use for the past four decades, is showing its limitations in reducing significantly the uncertainties in neutron cross sections below their current level. This suggests that a new approach should be considered. This PhD work aims at demonstrating that a major qualitative improvement is possible by changing the reference frame historically used for evaluating nuclear data model. The central idea was to move from restrictive frame of the incident neutron and target nucleus to the more general frame of the excited compound system. Such a change, which implies the simultaneous modelling of all the reactions leading to the same compound system, opens up the possibility of direct comparison between nuclear model parameters, whether those are derived for reactor physics applications for reactor physics applications, astrophysics or basic nuclear spectroscopy studies. This have the double advantage of bringing together evaluation activities performed separately, and of pooling experimental databases and basic theoretical nuclear parameter files. During this PhD thesis, a new module, so called TORA (TOol for Reactions Analysis), was implemented within the CONRAD system of the CEA/LEPh, to allow the change of paradigm foreseen for next generation of evaluated neutron cross sections. After rigorous numerical validation of the TORA module, this work ends by associated studies within this new frame.
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Submitted on : Tuesday, May 5, 2020 - 3:34:50 PM
Last modification on : Sunday, June 26, 2022 - 12:32:01 AM


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Aloys Nizigama. Approche novatrice de l'évaluation des réactions nucléaires par une modélisation multivoie unificatrice. Physique [physics]. Aix-Marseille Université (AMU), 2019. Français. ⟨tel-02563752⟩



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