High Resolution Photoexcitation Measurements Exacerbate the Long-Standing 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., Shah C; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.; NASA/Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, Maryland 20771, USA., López-Urrutia JRC; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Fujii K; Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 615-8540, Japan., Steinbrügge R; Deutsches Elektronen-Sychrotron DESY, Notkestraße 85, 22607 Hamburg, Germany., Stierhof J; Dr. Karl Remeis-Sternwarte, Sternwartstraße 7, 96049 Bamberg, Germany., Togawa M; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Harman Z; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Oreshkina NS; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Cheung C; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA., Kozlov MG; Petersburg Nuclear Physics Institute of NRC 'Kurchatov Institute', Gatchina 188300, Russia.; St. Petersburg Electrotechnical University 'LETI', Prof. Popov Str. 5, St. Petersburg 197376, Russia., Porsev SG; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.; Petersburg Nuclear Physics Institute of NRC 'Kurchatov Institute', Gatchina 188300, Russia., Safronova MS; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.; Joint Quantum Institute, National Institute of Standards and Technology and the University of Maryland, Gaithersburg, Maryland 20742, USA., Berengut JC; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.; School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia., Rosner M; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Bissinger M; Dr. Karl Remeis-Sternwarte, Sternwartstraße 7, 96049 Bamberg, Germany.; Erlangen Centre for Astroparticle Physics (ECAP), Erwin-Rommel-Straße 1, 91058 Erlangen, Germany., Ballhausen R; Dr. Karl Remeis-Sternwarte, Sternwartstraße 7, 96049 Bamberg, Germany., Hell N; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA., Park S; Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulsan 44919, South Korea., Chung M; Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulsan 44919, South Korea., Hoesch M; Deutsches Elektronen-Sychrotron DESY, Notkestraße 85, 22607 Hamburg, Germany., Seltmann J; Deutsches Elektronen-Sychrotron DESY, Notkestraße 85, 22607 Hamburg, Germany., Surzhykov AS; Physikalisch-Technische Bundesanstalt, Bundesalle 100, 38116 Braunschweig, Germany.; Braunschweig University of Technology, Universitätsplatz 2, 38106 Braunschweig, Germany., Yerokhin VA; Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia., Wilms J; Dr. Karl Remeis-Sternwarte, Sternwartstraße 7, 96049 Bamberg, Germany., Porter FS; NASA/Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, Maryland 20771, USA., Stöhlker T; 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., Keitel CH; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Pfeifer T; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany., Brown GV; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA., Leutenegger MA; NASA/Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, Maryland 20771, USA., 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.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2020 Jun 05; Vol. 124 (22), pp. 225001.
DOI: 10.1103/PhysRevLett.124.225001
Abstrakt: For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic 2p-3d transitions, 3C and 3D, in Fe XVII ions found oscillator strength ratios f(3C)/f(3D) disagreeing with theory, but uncertainties had precluded definitive statements on this much studied conundrum. Here, we resonantly excite these lines using synchrotron radiation at PETRA III, and reach, at a millionfold lower photon intensities, a 10 times higher spectral resolution, and 3 times smaller uncertainty than earlier work. Our final result of f(3C)/f(3D)=3.09(8)(6) supports many of the earlier clean astrophysical and laboratory observations, while departing by five sigmas from our own newest large-scale ab initio calculations, and excluding all proposed explanations, including those invoking nonlinear effects and population transfers.
Databáze: MEDLINE