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Approaches for theoretical and experimental determinations of K -shell decay rates and fluorescence yields in Ge

Abstract : Fluorescence yields are one of the fundamental parameters in atomic physics and related areas. Despite the increase of experimental work in the last decade, to obtain values of K-shell fluorescence yields available data are scarce or outdated for many elements. The available theoretical results cannot fill the gap since quite often they are derived from semi-empirical calculations based on old models. This is the case of Ge that has many applications in science. In this work, we present the results of a collaboration between an experimental and a theoretical group to obtain the decay rates and fluorescence yields for Ge. The calculations were performed within the Dirac-Fock method, including relativistic and QED corrections, using a state-of-the-art approach. The experimental work was carried out at the SOLEIL synchrotron and the fluorescence yields were measured by two distinct methods: the reflection geometry method and the escape peak method. The results show a very good agreement between the experiment and theory (1.1%), well within the experimental uncertainty (2.4%).
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https://hal-cea.archives-ouvertes.fr/cea-01833261
Contributor : Yves Ménesguen <>
Submitted on : Monday, July 9, 2018 - 2:59:43 PM
Last modification on : Wednesday, October 14, 2020 - 3:43:52 AM

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J. Sampaio, T. Madeira, J. Marques, F. Parente, A. Costa, et al.. Approaches for theoretical and experimental determinations of K -shell decay rates and fluorescence yields in Ge. Physical Review A, American Physical Society, 2014, 89 (1), pp.012512. ⟨10.1103/PhysRevA.89.012512⟩. ⟨cea-01833261⟩

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