New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem.

Autor: Kühn S; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.; Heidelberg Graduate School of Fundamental Physics, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany., Cheung C; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA., Oreshkina NS; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Steinbrügge R; Deutsches Elektronen-Sychrotron DESY, Notkestraße 85, 22607 Hamburg, Germany., Togawa M; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Bernitt S; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.; Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.; Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany.; GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany., Berger L; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Buck J; Institut für Experimentelle und Angewandte Physik (IEAP), Christian-Albrechts-Universität zu Kiel, Leibnizstr. 11-19, 24098 Kiel, Germany., Hoesch M; Deutsches Elektronen-Sychrotron DESY, Notkestraße 85, 22607 Hamburg, Germany., Seltmann J; Deutsches Elektronen-Sychrotron DESY, Notkestraße 85, 22607 Hamburg, Germany., Trinter F; Institut für Kernphysik, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany.; Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany., Keitel CH; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Kozlov MG; St. Petersburg Electrotechnical University 'LETI,' Prof. Popovstrasse 5, Saint Petersburg 197376, Russia., Porsev SG; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA., Gu MF; Space Science Laboratory, University of California, Berkeley, California 94720, USA., Porter FS; NASA/Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA., Pfeifer T; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Leutenegger MA; NASA/Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA., Harman Z; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Safronova MS; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA., López-Urrutia JRC; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Shah C; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.; NASA/Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2022 Dec 09; Vol. 129 (24), pp. 245001.
DOI: 10.1103/PhysRevLett.129.245001
Abstrakt: One of the most enduring and intensively studied problems of x-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity ratio of two Fe XVII transitions of crucial value for plasma diagnostics, dubbed 3C and 3D. We unravel this conundrum at the PETRA III synchrotron facility by increasing the resolving power 2.5 times and the signal-to-noise ratio thousandfold compared with our previous work. The Lorentzian wings had hitherto been indistinguishable from the background and were thus not modeled, resulting in a biased line-strength estimation. The present experimental oscillator-strength ratio R_{exp}=f_{3C}/f_{3D}=3.51(2)_{stat}(7)_{sys} agrees with our state-of-the-art calculation of R_{th}=3.55(2), as well as with some previous theoretical predictions. To further rule out any uncertainties associated with the measured ratio, we also determined the individual natural linewidths and oscillator strengths of 3C and 3D transitions, which also agree well with the theory. This finally resolves the decades-old mystery of Fe XVII oscillator strengths.
Databáze: MEDLINE