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Mesures de sections efficaces de fission induite par neutrons sur des actinides du cycle du thorium à n_TOF.

Abstract : In the frame of innovating energy source system studies, thorium fuel cycle reactors are considered. Neutron induced fission cross section on such cycle involved actinides play a role in scenario studies. To feel them, data bases are built with experimental results and nuclear models; For some nuclei, they are not complete or in disagreement. In order to complete these data bases, we have built an original set up, consisting in an alternation of PPACs and ultra-thin targets, which we installed on n_TOF facility. We describe detectors, set up, and the particular care brought to target making and characterisation. Fission products in coincidence are detected with precise time measurement and localization with delay line read out method. We contributed, within the n_TOF collaboration, to the CERN brand new intense spallation neutron source characterisation, based on time of flight measurement, and we describe its characteristics and performances. We are able to mesure such actinide fission cross sections as ^{232}Th, ^{234}U, ^{233}U, ^{237}Np, ^{209}Bi, and ^{nat}Pb, relative to ^{235}U and ^{238}U standards, using an innovative acquisition system. We took advantage of the large accessible energy field from 0.7 eV to 1 GeV, combined with the excellent energy resolution in this field. Data treatement and analysis advancement are described to enlighten performance and limits of the obtained results.
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https://tel.archives-ouvertes.fr/tel-00011454
Contributor : Marie-Christine Blanchet <>
Submitted on : Tuesday, January 24, 2006 - 4:41:06 PM
Last modification on : Wednesday, October 14, 2020 - 3:42:21 AM
Long-term archiving on: : Saturday, April 3, 2010 - 9:42:54 PM

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  • HAL Id : tel-00011454, version 1

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Laure Ferrant. Mesures de sections efficaces de fission induite par neutrons sur des actinides du cycle du thorium à n_TOF.. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011454⟩

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