A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods

F. Delahaye, N. R. Badnell, C. P. Ballance, P. Palmeri, S. Preval, P. Quinet, C. Ramsbottom, R. T. Smyth, M. Turkington, C. J. Zeippen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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The present debate on the reliability of astrophysical opacities has reached a new climax with the recent measurements of Fe opacities on the Z-machine at the Sandia National Laboratory (Bailey et al 2015). To understand the differences between theoretical results, on the one hand, and experiments on the other, as well as the differences among the various theoretical results, detailed comparisons are needed. Many ingredients are involved in the calculation of opacities; deconstructing the whole process and comparing the differences at each step are necessary to quantify their importance and impact on the final results. We present here such a comparison using the two main approaches to calculate the required atomic data, the R-Matrix and distorted-wave methods, as well as sets of configurations and coupling schemes to quantify the effects on the opacities for the Fe XVII and Ni XIV ions.
Original languageEnglish
Title of host publicationWorkshop on Astrophysical Opacities: Proceedings
EditorsClaudio Mendoza, Sylvaine Turck-Chieze, James Colgan
PublisherAstronomical Society of the Pacific
Number of pages10
ISBN (Electronic)978-1-58381-915-9
ISBN (Print)978-1-58381-914-2
Publication statusPublished - 2018

Publication series

NameAstronomical Society of the Pacific Conference Series
ISSN (Print)1050-3390

Bibliographical note

10 pages, 2 figures


  • astro-ph.SR
  • physics.atom-ph


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