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Mesure de sections efficaces de réactions (n,xn) par spectroscopie gamma prompte auprès d'un faisceau à très haut flux instantané

Strahinja Lukic
Abstract : The work presented in this thesis is situated in the context of GEDEON program of neutron cross-section measurements. This program is motivated by the perspectives recently opened by projects of nuclear waste treatment and energy production. There is an obvious lack of experimental data on (n,xn) reactions in the databases, especially in the case of very radioactive isotopes. An important technique to measure cross-sections of these reactions is the prompt γ-ray spectroscopy at white pulsed neutron beams with very high instantaneous flux. In this work, inelastic scattering and (n,xn) reactions cross-section measurements were performed on a lead sample from threshold to 20 MeV by prompt γ-ray spectroscopy at the white neutron beam generated by GELINA facility in Geel, Belgium. Digital methods were developed to treat HPGe CLOVER detector signals and separate γ-rays induced by the fastest neutrons from those belonging to the flash. Partial cross-sections for the production of several transitions in natural lead were measured and analyzed using theoretical calculations in order to separate the contributions of different reactions leading to the same residual isotope. Total cross-sections of the reactions in question were estimated. The results were compared to the TALYSS code theoretical calculations, as well as to other experimental results. This experiment served to validate the method and it opens the way to measure (n,xn) reactions cross-sections at high instantaneous flux neutron beams such as the one at n_TOF.
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Submitted on : Wednesday, March 23, 2005 - 1:02:51 PM
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  • HAL Id : tel-00008853, version 1

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Strahinja Lukic. Mesure de sections efficaces de réactions (n,xn) par spectroscopie gamma prompte auprès d'un faisceau à très haut flux instantané. Physique Nucléaire Théorique [nucl-th]. Université Louis Pasteur - Strasbourg I, 2004. Français. ⟨tel-00008853⟩

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