P. Que-le and . Est-sensible-aux-bulles-de-xénon, Or, on identifie des bulles volumineuses et des petites bulles dans la zone 3 qui n'entraînent pas de modification du paramètre S par rapport au bulk déterminé par PAS

. Afin-d-'expliquer-nos-résultats, une des hypothèses pouvant être émises repose sur une pression différente des bulles suivant leur localisation dans l'échantillon et que cette pression influence la mesure PAS. Cette hypothèse est corroborée, d'une part par les études de Saito et al.] qui ont montré que le taux de conversion o-Ps ' p-Ps dépend de la pression du gaz utilisé (xénon dans leur expérience) et d'autre part, 2006.

. Donnelly, Zone 3) pourraient se dépressuriser via plusieurs mécanismes décrits par, 1991.

. Dans-la-littérature, irradiation a un impact important sur le relâchement des gaz de fission dans UO 2 pour les températures inférieures à 1400 °C. Dans le combustible, deux types d'interactions sont susceptibles d'entraîner la migration du xénon : les chocs balistiques et les excitations électroniques. Pour simuler les chocs balistiques, nous avons irradié les échantillons avec des ions argon de 800 keV

!. Sgg2&, >%2-4444444444444444444444444444444444444444444444444444-5M:! "[#$#! Q&'1-&'!9-,<*2*+4*-&'!i!*--43*4, 4R&:!3&'!*)+'!*)3&!3&!$B8!Q&[! ! 6666! $BJ! "[#8#! "--43*4/*)+!4R&:!*)+'!*)3&!3&!$78!Q&[! ! 666666666666666666666666666! $I$!

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