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<dc:title xml:lang="en">Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf</dc:title>
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<dc:subject xml:lang="fr">Neutrons de scission</dc:subject>
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<dc:subject xml:lang="en">Spontaneous fission</dc:subject>
<dc:subject xml:lang="en">Neutron emission</dc:subject>
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<dcterms:abstract xml:lang="fr">L'objectif de cette thèse est d'explorer les mécanismes d'émission des neutrons émis lors du processus de la fission. En particulier, la question ouverte de l'existence d'une anisotropie dynamique dans le centre de masse des fragments de fission et/ou de la possibilité d'une émission de neutrons de scission est explorée. La thèse débute par une introduction aux concepts théoriques permettant de décrire les processus de fission et les mécanismes d'émission de neutrons. La nécessité de concevoir une méthode d'analyse appropriée pour caractériser des mécanismes très subtiles est discutée, en insistant sur l'importance de maîtriser les biais expérimentaux. Le travail effectué a exigé un effort important de simulation, à travers le développement d'une procédure Monte Carlo pour décrire la fission spontanée du 252Cf, ainsi qu'une modélisation du dispositif expérimental de l'expérience CORA3.Nous proposons pour la première fois une approche simultanée et indépendante des deux mécanismes, émission de scission et anisotropie dynamique, ainsi que des valeurs quantitatives d'anisotropie et d'émission de scission mesurées expérimentalement.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The subject of this thesis is to explore the neutron emission mechanisms in the fission process. In particular a long standing open question, the existence of a dynamical anisotropy in the centre of mass of the fission fragments and/or a possible scission neutron emission is explored. The thesis starts with an overview of the theoretical concepts on the fission process and on the neutron emission mechanisms. Also the necessity to conceive an appropriate analysis method is stressed when a very subtle mechanism is studied as various approximations and/or experimental biases not completely handled can hide the physical phenomena. In the presented work a huge effort was required to write a Monte Carlo procedure based on a coherent model for the spontaneous fission of 252Cf and to couple it with the devices exploited in the CORA3 experiment.</dcterms:abstract>
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