Etude du ralentissement des ions dans une cible diatomique
- 1 January 1978
- journal article
- research article
- Published by Taylor & Francis in Radiation Effects
- Vol. 38 (3-4), 133-139
- https://doi.org/10.1080/00337577808233221
Abstract
Nous présentons une méthode de calcul qui permet de determiner le nombre de défauts ponctuels créés dans une cascade de déplacements initiée par un ion lourd se ralentissant dans une cible diatomique. La méthode est utilisée pour déterminer le nombre d'atomes uranium et oxygéne places par une fission dans UO2. A computational code is described which determines the number of point defects in a displacement cascade initiated by a heavy ion in a diatomic target. The present method is based on the defect number expression for monoatomic materials given by N(E) = ∫τ tn(T)v(T)dT, where n(T) describes the primary knock-ons distribution produced by an incident particle of energy E and v(T) accounts for the defects generated by each primary knock-on having energy T. That formula is generalized by considering the displacements produced on the two sublattices formed by different atoms. The resulting equations of Volterra type can be resolved by multistep numerical method. This formalism is applied to UO2, to calculate the number of uranium and oxygen atoms displaced by a mean fission fragment, and by uranium and oxygen ions.Keywords
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