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Theses

Etude de la fission d'actinides produits par réactions de transfert multinucléon en cinématique inverse

Abstract : The study of actinide fission encounters two major issues. On one hand, measurements of the fission fragment distributions and the fission probabilities allow a better understanding of the fission process itself and the discrimination among the models of nuclear structure and dynamics. On the other hand, new measurements are required to improve nuclear data bases, which are a key component for the design of new generation reactors and radio-toxic waste incinerators. This thesis is in line with different French and American experimental projects using the surrogate method, i.e. transfer reactions leading to the same compound nuclei as in neutron irradiation, allowing the study of fission of actinides which are inaccessible by conventional techniques, whereas they are important for applications. The experiment is based on multi-nucleon transfer reactions between a 238U beam and a 12C target, using the inverse kinematics technique to measure, for each transfer channel, the complete isotopic distributions of the fission fragments with the VAMOS spectrometer. The work presented in this dissertation is focused on the identification of the transfer channels and their properties, as their angular distributions and the distributions of the associated excitation energy, using the SPIDER telescope to identify the target recoil nuclei. This work of an exploratory nature aims to generalize the surrogate method to heavy transfers and to measure, for the first time, the fission probabilities in inverse kinematics. The obtained results are compared with available direct kinematics and neutron irradiation measurements.
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https://tel.archives-ouvertes.fr/tel-00539788
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Submitted on : Thursday, November 25, 2010 - 10:26:07 AM
Last modification on : Wednesday, May 11, 2022 - 4:40:21 AM
Long-term archiving on: : Saturday, February 26, 2011 - 2:54:17 AM

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  • HAL Id : tel-00539788, version 1

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X. Derkx. Etude de la fission d'actinides produits par réactions de transfert multinucléon en cinématique inverse. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 2010. Français. ⟨tel-00539788⟩

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