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Contribution à l’étude de la fission nucléaire : de LOHENGRIN à FIPPS

Abstract : Nuclear fission consists in splitting a nucleus, in general an actinide, into smaller nuclei. Despite nuclear fission was discovered in 1939 by Hahn and Strassman, fission models cannot predict the fission observables with an acceptable accuracy for nuclear fuel cycle studies for instance. Improvement of fission models is an important issue for the knowledge of the process itself and for the applications. To reduce uncertainties of the nuclear data used in a nuclear reactor simulation, a validation of the models hypothesis is mandatory. In this work, two features of the nuclear fission were investigated in order to test the resistance of the theories. One aspect is the study of the symmetric fission fragments through the measurement of their yield and kinetic energy distribution. The other aspect is the study of the fission fragment angular momentum. Two techniques are available to assess the angular momentum of a fission fragment. The first one is to look at the properties of the prompt γ. The new spectrometer FIPPS (FIssion Product Prompt γ-ray Spectrometer), is currently under development at the ILL and will combine a fission filter with a large array of γ and neutron detectors in order to respond to these issues. The first part of this work is dedicated to the study of the properties of a Gas Filled Magnet (GFM) which is the type of fission filter considered for the FIPPS project. The second part of this work deals with the measurement of isomeric yields and evaluations of the angular momentum distribution of fission fragments. The study of the spherical nucleus ¹³²Sn shed the light on the current limits of fission models. Finally, the last part of this work is about the measurement of the yields and kinetic energy distributions of symmetric fission fragments. Since models predict the existence of fission modes, the symmetry region is a suitable choice to investigate this kind of prediction. In parallel with all these studies, an emphasis on the development of new methods derived from statistical tools is achieved in order to better control the uncertainties and estimate the biases.
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Abdelaziz Chebboubi. Contribution à l’étude de la fission nucléaire : de LOHENGRIN à FIPPS. Physique Nucléaire Expérimentale [nucl-ex]. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAY039⟩. ⟨tel-01272599⟩

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