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Loetzsch R, Beyer HF, Duval L, Spillmann U, Banaś D, Dergham P, Kröger FM, Glorius J, Grisenti RE, Guerra M, Gumberidze A, Heß R, Hillenbrand PM, Indelicato P, Jagodzinski P, Lamour E, Lorentz B, Litvinov S, Litvinov YA, Machado J, Paul N, Paulus GG, Petridis N, Santos JP, Scheidel M, Sidhu RS, Steck M, Steydli S, Szary K, Trotsenko S, Uschmann I, Weber G, Stöhlker T, Trassinelli M. Testing quantum electrodynamics in extreme fields using helium-like uranium. Nature 2024; 625:673-678. [PMID: 38267680 PMCID: PMC10808054 DOI: 10.1038/s41586-023-06910-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 11/28/2023] [Indexed: 01/26/2024]
Abstract
Quantum electrodynamics (QED), the quantum field theory that describes the interaction between light and matter, is commonly regarded as the best-tested quantum theory in modern physics. However, this claim is mostly based on extremely precise studies performed in the domain of relatively low field strengths and light atoms and ions1-6. In the realm of very strong electromagnetic fields such as in the heaviest highly charged ions (with nuclear charge Z ≫ 1), QED calculations enter a qualitatively different, non-perturbative regime. Yet, the corresponding experimental studies are very challenging, and theoretical predictions are only partially tested. Here we present an experiment sensitive to higher-order QED effects and electron-electron interactions in the high-Z regime. This is achieved by using a multi-reference method based on Doppler-tuned X-ray emission from stored relativistic uranium ions with different charge states. The energy of the 1s1/22p3/2 J = 2 → 1s1/22s1/2 J = 1 intrashell transition in the heaviest two-electron ion (U90+) is obtained with an accuracy of 37 ppm. Furthermore, a comparison of uranium ions with different numbers of bound electrons enables us to disentangle and to test separately the one-electron higher-order QED effects and the bound electron-electron interaction terms without the uncertainty related to the nuclear radius. Moreover, our experimental result can discriminate between several state-of-the-art theoretical approaches and provides an important benchmark for calculations in the strong-field domain.
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Affiliation(s)
- R Loetzsch
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena, Germany.
| | - H F Beyer
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - L Duval
- Laboratoire Kastler Brossel, Sorbonne Université, ENS-PSL Research University, Collège de France, CNRS, Paris, France
| | - U Spillmann
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - D Banaś
- Institute of Physics, Jan Kochanowski University, Kielce, Poland
| | - P Dergham
- Institut des NanoSciences de Paris, CNRS, Sorbonne Université, Paris, France
| | - F M Kröger
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
- Helmholtz-Institut Jena, Jena, Germany
| | - J Glorius
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - R E Grisenti
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - M Guerra
- Laboratory of Instrumentation, Biomedical Engineering and Radiation Physics (LIBPhys-UNL), Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
| | - A Gumberidze
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - R Heß
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - P-M Hillenbrand
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
- I. Physikalisches Institut, Justus-Liebig-Universität, Giessen, Germany
| | - P Indelicato
- Laboratoire Kastler Brossel, Sorbonne Université, ENS-PSL Research University, Collège de France, CNRS, Paris, France
| | - P Jagodzinski
- Institute of Physics, Jan Kochanowski University, Kielce, Poland
| | - E Lamour
- Institut des NanoSciences de Paris, CNRS, Sorbonne Université, Paris, France
| | - B Lorentz
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - S Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - J Machado
- Laboratory of Instrumentation, Biomedical Engineering and Radiation Physics (LIBPhys-UNL), Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
| | - N Paul
- Laboratoire Kastler Brossel, Sorbonne Université, ENS-PSL Research University, Collège de France, CNRS, Paris, France
| | - G G Paulus
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena, Germany
- Helmholtz-Institut Jena, Jena, Germany
| | - N Petridis
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
- Institut für Kernphysik, Goethe-Universität, Frankfurt am Main, Germany
| | - J P Santos
- Laboratory of Instrumentation, Biomedical Engineering and Radiation Physics (LIBPhys-UNL), Department of Physics, NOVA School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
| | - M Scheidel
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - R S Sidhu
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
- School of Physics and Astronomy, The University of Edinburgh, Edinburgh, UK
| | - M Steck
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - S Steydli
- Institut des NanoSciences de Paris, CNRS, Sorbonne Université, Paris, France
| | - K Szary
- Institute of Physics, Jan Kochanowski University, Kielce, Poland
| | - S Trotsenko
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
- Helmholtz-Institut Jena, Jena, Germany
| | - I Uschmann
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena, Germany
| | - G Weber
- Helmholtz-Institut Jena, Jena, Germany
| | - Th Stöhlker
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
- Helmholtz-Institut Jena, Jena, Germany
| | - M Trassinelli
- Institut des NanoSciences de Paris, CNRS, Sorbonne Université, Paris, France.
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Sommerfeldt J, Yerokhin VA, Stöhlker T, Surzhykov A. All-Order Coulomb Corrections to Delbrück Scattering above the Pair-Production Threshold. Phys Rev Lett 2023; 131:061601. [PMID: 37625040 DOI: 10.1103/physrevlett.131.061601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 07/06/2023] [Indexed: 08/27/2023]
Abstract
We report calculations of Delbrück scattering that include all-order Coulomb corrections for photon energies above the threshold of electron-positron pair creation. Our approach is based on the application of the Dirac-Coulomb Green's function and accounts for the interaction between the virtual electron-positron pair and the nucleus to all orders in the nuclear binding strength parameter αZ. Practical calculations are performed for the scattering of 2.754 MeV photons off plutonium atoms. We find that including the Coulomb corrections enhances the scattering cross section by up to 50% in this case. The obtained results resolve the long-standing discrepancy between experimental data and theoretical predictions and demonstrate that an accurate treatment of the Coulomb corrections is crucial for the interpretation of existing and guidance of future Delbrück scattering experiments on heavy atoms.
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Affiliation(s)
- J Sommerfeldt
- Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany
- Technische Universität Braunschweig, D-38106 Braunschweig, Germany
| | - V A Yerokhin
- Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
| | - Th Stöhlker
- Helmholtz Institute Jena, D-07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - A Surzhykov
- Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany
- Technische Universität Braunschweig, D-38106 Braunschweig, Germany
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3
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Stierhof J, Kühn S, Winter M, Micke P, Steinbrügge R, Shah C, Hell N, Bissinger M, Hirsch M, Ballhausen R, Lang M, Gräfe C, Wipf S, Cumbee R, Betancourt-Martinez GL, Park S, Niskanen J, Chung M, Porter FS, Stöhlker T, Pfeifer T, Brown GV, Bernitt S, Hansmann P, Wilms J, Crespo López-Urrutia JR, Leutenegger MA. A new benchmark of soft X-ray transition energies of Ne , CO 2 , and SF 6 : paving a pathway towards ppm accuracy. Eur Phys J D At Mol Opt Phys 2022; 76:38. [PMID: 35273463 PMCID: PMC8888507 DOI: 10.1140/epjd/s10053-022-00355-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/23/2022] [Indexed: 06/14/2023]
Abstract
ABSTRACT A key requirement for the correct interpretation of high-resolution X-ray spectra is that transition energies are known with high accuracy and precision. We investigate the K-shell features of Ne , CO 2 , and SF 6 gases, by measuring their photo ion-yield spectra at the BESSY II synchrotron facility simultaneously with the 1s-np fluorescence emission of He-like ions produced in the Polar-X EBIT. Accurate ab initio calculations of transitions in these ions provide the basis of the calibration. While the CO 2 result agrees well with previous measurements, the SF 6 spectrum appears shifted by ∼ 0.5 eV, about twice the uncertainty of the earlier results. Our result for Ne shows a large departure from earlier results, but may suffer from larger systematic effects than our other measurements. The molecular spectra agree well with our results of time-dependent density functional theory. We find that the statistical uncertainty allows calibrations in the desired range of 1-10 meV, however, systematic contributions still limit the uncertainty to ∼ 40-100 meV, mainly due to the temporal stability of the monochromator energy scale. Combining our absolute calibration technique with a relative energy calibration technique such as photoelectron energy spectroscopy will be necessary to realize its full potential of achieving uncertainties as low as 1-10 meV.
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Affiliation(s)
- J. Stierhof
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - S. Kühn
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - M. Winter
- Institute of Theoretical Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7/B2, 91058 Erlangen, Germany
- CNRS, Institut NEEL, Université Grenoble Alpes, CNRS, Institut NEEL, 25 rue des Martyrs BP 166, 38042 Grenoble Cedex 9, France
| | - P. Micke
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- CERN, 1211 Geneva 23, Switzerland
| | - R. Steinbrügge
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - C. Shah
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771 USA
- Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA 94550 USA
| | - N. Hell
- Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA 94550 USA
| | - M. Bissinger
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - M. Hirsch
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - R. Ballhausen
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - M. Lang
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - C. Gräfe
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - S. Wipf
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - R. Cumbee
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771 USA
- Department of Astronomy, University of Maryland, College Park, MD 20742 USA
| | - G. L. Betancourt-Martinez
- Institut de Recherche en Astrophysique et Planétologie, 9, avenue du Colonel Roche BP 44346, 31028 Toulouse Cedex 4, France
| | - S. Park
- Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulsan, South Korea
| | - J. Niskanen
- Institute for Methods and Instrumentation in Synchrotron Radiation Research G-ISRR, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - M. Chung
- Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulsan, South Korea
| | - F. S. Porter
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771 USA
| | - T. Stöhlker
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - T. Pfeifer
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - G. V. Brown
- Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA 94550 USA
| | - S. Bernitt
- 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
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - P. Hansmann
- Institute of Theoretical Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7/B2, 91058 Erlangen, Germany
| | - J. Wilms
- Dr. Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | | | - M. A. Leutenegger
- NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771 USA
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4
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Leutenegger MA, Kühn S, Micke P, Steinbrügge R, Stierhof J, Shah C, Hell N, Bissinger M, Hirsch M, Ballhausen R, Lang M, Gräfe C, Wipf S, Cumbee R, Betancourt-Martinez GL, Park S, Yerokhin VA, Surzhykov A, Stolte WC, Niskanen J, Chung M, Porter FS, Stöhlker T, Pfeifer T, Wilms J, Brown GV, Crespo López-Urrutia JR, Bernitt S. High-Precision Determination of Oxygen K_{α} Transition Energy Excludes Incongruent Motion of Interstellar Oxygen. Phys Rev Lett 2020; 125:243001. [PMID: 33412031 DOI: 10.1103/physrevlett.125.243001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 10/19/2020] [Accepted: 10/30/2020] [Indexed: 06/12/2023]
Abstract
We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions of highly charged ions, allowing us to measure the K-shell Rydberg spectrum of molecular O_{2} with 8 meV uncertainty. We reveal a systematic ∼450 meV shift from previous literature values, and settle an extraordinary discrepancy between astrophysical and laboratory measurements of neutral atomic oxygen, the latter being calibrated against the aforementioned O_{2} literature values. Because of the widespread use of such, now deprecated, references, our method impacts on many branches of x-ray absorption spectroscopy. Moreover, it potentially reduces absolute uncertainties there to below the meV level.
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Affiliation(s)
- M A Leutenegger
- NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA
| | - S Kühn
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - P Micke
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
| | - R Steinbrügge
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - J Stierhof
- Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstrasse 7, 96049 Bamberg, Germany
| | - C Shah
- NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - N Hell
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - M Bissinger
- Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany
| | - M Hirsch
- Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstrasse 7, 96049 Bamberg, Germany
| | - R Ballhausen
- Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstrasse 7, 96049 Bamberg, Germany
| | - M Lang
- Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstrasse 7, 96049 Bamberg, Germany
| | - C Gräfe
- Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstrasse 7, 96049 Bamberg, Germany
| | - S Wipf
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - R Cumbee
- NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA
- Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA
| | - G L Betancourt-Martinez
- Institut de Recherche en Astrophysique et Planétologie, 9, avenue du Colonel Roche BP 44346, 31028 Toulouse Cedex 4, France
| | - S Park
- Ulsan National Institute of Science and Technology, 50 UNIST-gil, 44919 Ulsan, Republic of Korea
| | - V A Yerokhin
- Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
| | - A Surzhykov
- Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
- Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany
| | - W C Stolte
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J Niskanen
- Institute for Methods and Instrumentation in Synchrotron Radiation Research G-ISRR, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
- Department of Physics and Astronomy, University of Turku, FI-20014 Turun Yliopisto, Finland
| | - M Chung
- Ulsan National Institute of Science and Technology, 50 UNIST-gil, 44919 Ulsan, Republic of Korea
| | - F S Porter
- NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA
| | - T Stöhlker
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - T Pfeifer
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - J Wilms
- Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstrasse 7, 96049 Bamberg, Germany
| | - G V Brown
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | | | - S Bernitt
- 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
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
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5
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Sanjari MS, Dmytriiev D, Litvinov YA, Gumenyuk O, Hess R, Joseph R, Litvinov SA, Steck M, Stöhlker T. A 410 MHz resonant cavity pickup for heavy ion storage rings. Rev Sci Instrum 2020; 91:083303. [PMID: 32872954 DOI: 10.1063/5.0009094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 08/09/2020] [Indexed: 06/11/2023]
Abstract
An improved design of a longitudinally sensitive resonant Schottky cavity pickup for the heavy ion storage rings of the Facility for Antiproton and Ion Research in Europe (FAIR) project is reported. The new detector has a higher measured Q value of ∼3000 and a higher simulated shunt impedance of 473.3 kΩ. It is possible to vary the sensitivity of the cavity with a motorized mechanism by inserting a dissipative blade during the operation based on experimental needs. Apart from a lower price tag, the new design features a more robust and production-friendly mechanical structure suitable for a series production in the future FAIR project. The manufactured cavity was built temporarily into the experimental storage ring and had delivered its first results using stored heavy ion beams. The structure, simulation results, and performance of this cavity are presented in this work.
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Affiliation(s)
- M S Sanjari
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - D Dmytriiev
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - Yu A Litvinov
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - O Gumenyuk
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - R Hess
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - R Joseph
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - S A Litvinov
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - M Steck
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
| | - Th Stöhlker
- GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt, Germany
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6
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Maltsev IA, Shabaev VM, Popov RV, Kozhedub YS, Plunien G, Ma X, Stöhlker T, Tumakov DA. How to Observe the Vacuum Decay in Low-Energy Heavy-Ion Collisions. Phys Rev Lett 2019; 123:113401. [PMID: 31573256 DOI: 10.1103/physrevlett.123.113401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 07/05/2019] [Indexed: 06/10/2023]
Abstract
In slow collisions of two bare nuclei with the total charge larger than the critical value Z_{cr}≈173, the initially neutral vacuum can spontaneously decay into the charged vacuum and two positrons. The detection of the spontaneous emission of positrons would be direct evidence of this fundamental phenomenon. However, the spontaneously produced particles are indistinguishable from the dynamical background in the positron spectra. We show that the vacuum decay can nevertheless be observed via impact-sensitive measurements of pair-production probabilities. The possibility of such an observation is demonstrated using numerical calculations of pair production in low-energy collisions of heavy nuclei.
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Affiliation(s)
- I A Maltsev
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
| | - V M Shabaev
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
| | - R V Popov
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
| | - Y S Kozhedub
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
- NRC Kurchatov Institute, Academician Kurchatov 1, 123182 Moscow, Russia
| | - G Plunien
- Institut für Theoretische Physik, Technische Universität Dresden, Mommsenstraße 13, D-01062 Dresden, Germany
| | - X Ma
- Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China
| | - Th Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, D-64291 Darmstadt, Germany
- Helmholtz-Institute Jena, D-07743 Jena, Germany
- Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany
| | - D A Tumakov
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
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7
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Glorius J, Langer C, Slavkovská Z, Bott L, Brandau C, Brückner B, Blaum K, Chen X, Dababneh S, Davinson T, Erbacher P, Fiebiger S, Gaßner T, Göbel K, Groothuis M, Gumberidze A, Gyürky G, Heil M, Hess R, Hensch R, Hillmann P, Hillenbrand PM, Hinrichs O, Jurado B, Kausch T, Khodaparast A, Kisselbach T, Klapper N, Kozhuharov C, Kurtulgil D, Lane G, Lederer-Woods C, Lestinsky M, Litvinov S, Litvinov YA, Löher B, Nolden F, Petridis N, Popp U, Rauscher T, Reed M, Reifarth R, Sanjari MS, Savran D, Simon H, Spillmann U, Steck M, Stöhlker T, Stumm J, Surzhykov A, Szücs T, Nguyen TT, Taremi Zadeh A, Thomas B, Torilov SY, Törnqvist H, Träger M, Trageser C, Trotsenko S, Varga L, Volknandt M, Weick H, Weigand M, Wolf C, Woods PJ, Xing YM. Approaching the Gamow Window with Stored Ions: Direct Measurement of ^{124}Xe(p,γ) in the ESR Storage Ring. Phys Rev Lett 2019; 122:092701. [PMID: 30932526 DOI: 10.1103/physrevlett.122.092701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/31/2019] [Indexed: 06/09/2023]
Abstract
We report the first measurement of low-energy proton-capture cross sections of ^{124}Xe in a heavy-ion storage ring. ^{124}Xe^{54+} ions of five different beam energies between 5.5 and 8 AMeV were stored to collide with a windowless hydrogen target. The ^{125}Cs reaction products were directly detected. The interaction energies are located on the high energy tail of the Gamow window for hot, explosive scenarios such as supernovae and x-ray binaries. The results serve as an important test of predicted astrophysical reaction rates in this mass range. Good agreement in the prediction of the astrophysically important proton width at low energy is found, with only a 30% difference between measurement and theory. Larger deviations are found above the neutron emission threshold, where also neutron and γ widths significantly impact the cross sections. The newly established experimental method is a very powerful tool to investigate nuclear reactions on rare ion beams at low center-of-mass energies.
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Affiliation(s)
- J Glorius
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - C Langer
- Goethe Universität, Frankfurt am Main, Germany
| | | | - L Bott
- Goethe Universität, Frankfurt am Main, Germany
| | - C Brandau
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Justus-Liebig Universität, Gießen, Germany
| | - B Brückner
- Goethe Universität, Frankfurt am Main, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
| | - X Chen
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - S Dababneh
- Al-Balqa Applied University, Salt, Jordan
| | - T Davinson
- University of Edinburgh, Edinburgh, United Kingdom
| | - P Erbacher
- Goethe Universität, Frankfurt am Main, Germany
| | - S Fiebiger
- Goethe Universität, Frankfurt am Main, Germany
| | - T Gaßner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - K Göbel
- Goethe Universität, Frankfurt am Main, Germany
| | - M Groothuis
- Goethe Universität, Frankfurt am Main, Germany
| | - A Gumberidze
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - G Gyürky
- Institute for Nuclear Research (MTA Atomki), Debrecen, Hungary
| | - M Heil
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - R Hess
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - R Hensch
- Goethe Universität, Frankfurt am Main, Germany
| | - P Hillmann
- Goethe Universität, Frankfurt am Main, Germany
| | - P-M Hillenbrand
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - O Hinrichs
- Goethe Universität, Frankfurt am Main, Germany
| | - B Jurado
- CENBG, CNRS-IN2P3, Gradignan, France
| | - T Kausch
- Goethe Universität, Frankfurt am Main, Germany
| | - A Khodaparast
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Goethe Universität, Frankfurt am Main, Germany
| | | | - N Klapper
- Goethe Universität, Frankfurt am Main, Germany
| | - C Kozhuharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - D Kurtulgil
- Goethe Universität, Frankfurt am Main, Germany
| | - G Lane
- Australian National University, Canberra, Australia
| | | | - M Lestinsky
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - S Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - B Löher
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Technische Universität Darmstadt, Darmstadt, Germany
| | - F Nolden
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - N Petridis
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - U Popp
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - T Rauscher
- Department of Physics, University of Basel, Switzerland
- Centre for Astrophysics Research, University of Hertfordshire, Hatfield, United Kingdom
| | - M Reed
- Australian National University, Canberra, Australia
| | - R Reifarth
- Goethe Universität, Frankfurt am Main, Germany
| | - M S Sanjari
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - D Savran
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - H Simon
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - U Spillmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - M Steck
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - T Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Helmholtz-Insitut Jena, Jena, Germany
| | - J Stumm
- Goethe Universität, Frankfurt am Main, Germany
| | - A Surzhykov
- Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
- Technische Universität Braunschweig, Braunschweig, Germany
| | - T Szücs
- Institute for Nuclear Research (MTA Atomki), Debrecen, Hungary
| | - T T Nguyen
- Goethe Universität, Frankfurt am Main, Germany
| | | | - B Thomas
- Goethe Universität, Frankfurt am Main, Germany
| | - S Yu Torilov
- St. Petersburg State University, St. Petersburg, Russia
| | - H Törnqvist
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Technische Universität Darmstadt, Darmstadt, Germany
| | - M Träger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - C Trageser
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Justus-Liebig Universität, Gießen, Germany
| | - S Trotsenko
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - L Varga
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - M Volknandt
- Goethe Universität, Frankfurt am Main, Germany
| | - H Weick
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - M Weigand
- Goethe Universität, Frankfurt am Main, Germany
| | - C Wolf
- Goethe Universität, Frankfurt am Main, Germany
| | - P J Woods
- University of Edinburgh, Edinburgh, United Kingdom
| | - Y M Xing
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
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8
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Micke P, Kühn S, Buchauer L, Harries JR, Bücking TM, Blaum K, Cieluch A, Egl A, Hollain D, Kraemer S, Pfeifer T, Schmidt PO, Schüssler RX, Schweiger C, Stöhlker T, Sturm S, Wolf RN, Bernitt S, Crespo López-Urrutia JR. The Heidelberg compact electron beam ion traps. Rev Sci Instrum 2018; 89:063109. [PMID: 29960545 DOI: 10.1063/1.5026961] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electron beam ion traps (EBITs) are ideal tools for both production and study of highly charged ions (HCIs). In order to reduce their construction, maintenance, and operation costs, we have developed a novel, compact, room-temperature design, the Heidelberg Compact EBIT (HC-EBIT). Four already commissioned devices operate at the strongest fields (up to 0.86 T) reported for such EBITs using permanent magnets, run electron beam currents up to 80 mA, and energies up to 10 keV. They demonstrate HCI production, trapping, and extraction of pulsed Ar16+ bunches and continuous 100 pA ion beams of highly charged Xe up to charge state 29+, already with a 4 mA, 2 keV electron beam. Moreover, HC-EBITs offer large solid-angle ports and thus high photon count rates, e.g., in x-ray spectroscopy of dielectronic recombination in HCIs up to Fe24+, achieving an electron-energy resolving power of E/ΔE > 1500 at 5 keV. Besides traditional on-axis electron guns, we have also implemented a novel off-axis gun for laser, synchrotron, and free-electron laser applications, offering clear optical access along the trap axis. We report on its first operation at a synchrotron radiation facility demonstrating the resonant photoexcitation of highly charged oxygen.
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Affiliation(s)
- P Micke
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - S Kühn
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - L Buchauer
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - J R Harries
- National Institutes for Quantum and Radiological Science and Technology, SPring-8, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - T M Bücking
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - A Cieluch
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - A Egl
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - D Hollain
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - S Kraemer
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - T Pfeifer
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - P O Schmidt
- Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
| | - R X Schüssler
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Ch Schweiger
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - T Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - S Sturm
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - R N Wolf
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - S Bernitt
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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9
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Abstract
In this contribution we review the present status of experimental studies of electroweak decays of highly charged ions. A particular focus will be given on the bound state beta decay measurement of 205Tl.
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10
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Wagner F, Hornung J, Schmidt C, Eckhardt M, Roth M, Stöhlker T, Bagnoud V. Backreflection diagnostics for ultra-intense laser plasma experiments based on frequency resolved optical gating. Rev Sci Instrum 2017; 88:023503. [PMID: 28249497 DOI: 10.1063/1.4975827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on the development and implementation of a time resolved backscatter diagnostics for high power laser plasma experiments at the petawatt-class laser facility PHELIX. Pulses that are backscattered or reflected from overcritical plasmas are characterized spectrally and temporally resolved using a specially designed second harmonic generation frequency resolved optical gating system. The diagnostics meets the requirements made by typical experiments, i.e., a spectral bandwidth of more than 30nm with sub-nanometer resolution and a temporal window of 10ps with 50fs temporal resolution. The diagnostics is permanently installed at the PHELIX target area and can be used to study effects such as laser-hole boring or relativistic self-phase-modulation which are important features of laser-driven particle acceleration experiments.
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Affiliation(s)
- F Wagner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - J Hornung
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - C Schmidt
- Hochschule Darmstadt, Haardtring 100, 64295 Darmstadt, Germany
| | - M Eckhardt
- Technische Hochschule Mittelhessen, Wilhelm-Leuschner-Straße 13, 61169 Friedberg, Germany
| | - M Roth
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - T Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - V Bagnoud
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
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11
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Volotka AV, Surzhykov A, Trotsenko S, Plunien G, Stöhlker T, Fritzsche S. Nuclear Excitation by Two-Photon Electron Transition. Phys Rev Lett 2016; 117:243001. [PMID: 28009197 DOI: 10.1103/physrevlett.117.243001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Indexed: 06/06/2023]
Abstract
A new mechanism of nuclear excitation via two-photon electron transitions (NETP) is proposed and studied theoretically. As a generic example, detailed calculations are performed for the E1E1 1s2s^{1}S_{0}→1s^{2}^{1}S_{0} two-photon decay of a He-like ^{225}Ac^{87+} ion with a resonant excitation of the 3/2+ nuclear state with an energy of 40.09(5) keV. The probability for such a two-photon decay via the nuclear excitation is found to be P_{NETP}=3.5×10^{-9} and, thus, is comparable with other mechanisms, such as nuclear excitation by electron transition and by electron capture. The possibility for the experimental observation of the proposed mechanism is thoroughly discussed.
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Affiliation(s)
- A V Volotka
- Helmholtz-Institut Jena, D-07743 Jena, Germany
- Department of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia
| | - A Surzhykov
- Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany
- Technische Universität Braunschweig, D-38106 Braunschweig, Germany
| | - S Trotsenko
- Helmholtz-Institut Jena, D-07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, D-07743 Jena, Germany
| | - G Plunien
- Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Th Stöhlker
- Helmholtz-Institut Jena, D-07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, D-07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - S Fritzsche
- Helmholtz-Institut Jena, D-07743 Jena, Germany
- Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität, D-07743 Jena, Germany
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12
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Höfer S, Kämpfer T, Förster E, Stöhlker T, Uschmann I. Communication: The formation of rarefaction waves in semiconductors after ultrashort excitation probed by grazing incidence ultrafast time-resolved x-ray diffraction. Struct Dyn 2016; 3:051101. [PMID: 27704034 PMCID: PMC5035306 DOI: 10.1063/1.4963011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 09/07/2016] [Indexed: 05/29/2023]
Abstract
We explore the InSb-semiconductor lattice dynamics after excitation of high density electron-hole plasma with an ultrashort and intense laser pulse. By using time resolved x-ray diffraction, a sub-mÅ and sub-ps resolution was achieved. Thus, a strain of 4% was measured in a 3 nm thin surface layer 2 ps after excitation. The lattice strain was observed for the first 5 ps as exponentially decaying, changing rapidly by time and by depth. The observed phenomena can only be understood assuming nonlinear time dependent laser absorption where the absorption depth decreases by a factor of twenty compared to linear absorption.
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13
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Wagner F, Deppert O, Brabetz C, Fiala P, Kleinschmidt A, Poth P, Schanz VA, Tebartz A, Zielbauer B, Roth M, Stöhlker T, Bagnoud V. Maximum Proton Energy above 85 MeV from the Relativistic Interaction of Laser Pulses with Micrometer Thick CH_{2} Targets. Phys Rev Lett 2016; 116:205002. [PMID: 27258872 DOI: 10.1103/physrevlett.116.205002] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Indexed: 06/05/2023]
Abstract
We present a study of laser-driven ion acceleration with micrometer and submicrometer thick plastic targets. Using laser pulses with high temporal contrast and an intensity of the order of 10^{20} W/cm^{2} we observe proton beams with cutoff energies in excess of 85 MeV and particle numbers of 10^{9} in an energy bin of 1 MeV around this maximum. We show that applying the target normal sheath acceleration mechanism with submicrometer thick targets is a very robust way to achieve such high ion energies and particle fluxes. Our results are backed with 2D particle in cell simulations furthermore predicting cutoff energies above 200 MeV for acceleration based on relativistic transparency. This predicted regime can be probed after a few technically feasible adjustments of the laser and target parameters.
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Affiliation(s)
- F Wagner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - O Deppert
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - C Brabetz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - P Fiala
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - A Kleinschmidt
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - P Poth
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - V A Schanz
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - A Tebartz
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - B Zielbauer
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - M Roth
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - T Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
| | - V Bagnoud
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
- Helmholtz Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
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14
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Hahn C, Weber G, Märtin R, Höfer S, Kämpfer T, Stöhlker T. CdTe Timepix detectors for single-photon spectroscopy and linear polarimetry of high-flux hard x-ray radiation. Rev Sci Instrum 2016; 87:043106. [PMID: 27131653 DOI: 10.1063/1.4945362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Single-photon spectroscopy of pulsed, high-intensity sources of hard X-rays - such as laser-generated plasmas - is often hampered by the pileup of several photons absorbed by the unsegmented, large-volume sensors routinely used for the detection of high-energy radiation. Detectors based on the Timepix chip, with a segmentation pitch of 55 μm and the possibility to be equipped with high-Z sensor chips, constitute an attractive alternative to commonly used passive solutions such as image plates. In this report, we present energy calibration and characterization measurements of such devices. The achievable energy resolution is comparable to that of scintillators for γ spectroscopy. Moreover, we also introduce a simple two-detector Compton polarimeter setup with a polarimeter quality of (98 ± 1)%. Finally, a proof-of-principle polarimetry experiment is discussed, where we studied the linear polarization of bremsstrahlung emitted by a laser-driven plasma and found an indication of the X-ray polarization direction depending on the polarization state of the incident laser pulse.
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Affiliation(s)
- C Hahn
- Helmholtz Institute Jena, 07743 Jena, Germany
| | - G Weber
- Helmholtz Institute Jena, 07743 Jena, Germany
| | - R Märtin
- Helmholtz Institute Jena, 07743 Jena, Germany
| | - S Höfer
- Helmholtz Institute Jena, 07743 Jena, Germany
| | - T Kämpfer
- Helmholtz Institute Jena, 07743 Jena, Germany
| | - Th Stöhlker
- Helmholtz Institute Jena, 07743 Jena, Germany
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15
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Tashenov S, Banaś D, Beyer H, Brandau C, Fritzsche S, Gumberidze A, Hagmann S, Hillenbrand PM, Jörg H, Kojouharov I, Kozhuharov C, Lestinsky M, Litvinov YA, Maiorova AV, Schaffner H, Shabaev VM, Spillmann U, Stöhlker T, Surzhykov A, Trotsenko S. Observation of coherence in the time-reversed relativistic photoelectric effect. Phys Rev Lett 2014; 113:113001. [PMID: 25259973 DOI: 10.1103/physrevlett.113.113001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Indexed: 06/03/2023]
Abstract
The photoelectric effect has been studied in the regime of hard x rays and strong Coulomb fields via its time-reversed process of radiative recombination (RR). In the experiment, the relativistic electrons recombined into the 2p_{3/2} excited state of hydrogenlike uranium ions, and both the RR x rays and the subsequently emitted characteristic x rays were detected in coincidence. This allowed us to observe the coherence between the magnetic substates in a highly charged ion and to identify the contribution of the spin-orbit interaction to the RR process.
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Affiliation(s)
- S Tashenov
- Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany
| | - D Banaś
- Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland
| | - H Beyer
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - C Brandau
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and FIAS Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany
| | - S Fritzsche
- Helmholtz-Institut Jena, 07743 Jena, Germany and Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - A Gumberidze
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and FIAS Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany
| | - S Hagmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - P-M Hillenbrand
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - H Jörg
- Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Ch Kozhuharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - M Lestinsky
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Yu A Litvinov
- Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany and GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - A V Maiorova
- St. Petersburg State University, 198504 St. Petersburg, Russia
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - V M Shabaev
- St. Petersburg State University, 198504 St. Petersburg, Russia
| | - U Spillmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Th Stöhlker
- Helmholtz-Institut Jena, 07743 Jena, Germany and Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - A Surzhykov
- Helmholtz-Institut Jena, 07743 Jena, Germany
| | - S Trotsenko
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany and Helmholtz-Institut Jena, 07743 Jena, Germany
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16
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Chen W, Vorobyev G, Guo D, Herfurth F, Hillenbrand PM, Spillmann U, Trotsenko S, Gumberidze A, Stöhlker T. Metal vapor target for precise studies of ion-atom collisions. Rev Sci Instrum 2014; 85:053513. [PMID: 24880375 DOI: 10.1063/1.4878626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Although different ion-atom collisions have been studied in various contexts, precise values of cross-sections for many atomic processes were seldom obtained. One of the main uncertainties originates from the value of target densities. In this paper, we describe a unique method to measure a target density precisely with a combination of physical vapor deposition and inductively coupled plasma optical emission spectrometry. This method is preliminarily applied to a charge transfer cross-section measurement in collisions between highly charged ions and magnesium vapor. The final relative uncertainty of the target density is less than 2.5%. This enables the precise studies of atomic processes in ion-atom collisions, even though in the trial test the deduction of precise capture cross-sections was limited by other systematic errors.
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Affiliation(s)
- W Chen
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - G Vorobyev
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 Gansu, China
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - P-M Hillenbrand
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - U Spillmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - S Trotsenko
- Helmholtz-Institut Jena Fröbelstieg 3, 07743 Jena, Germany
| | - A Gumberidze
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - Th Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
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17
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Jochmann A, Irman A, Bussmann M, Couperus JP, Cowan TE, Debus AD, Kuntzsch M, Ledingham KWD, Lehnert U, Sauerbrey R, Schlenvoigt HP, Seipt D, Stöhlker T, Thorn DB, Trotsenko S, Wagner A, Schramm U. High resolution energy-angle correlation measurement of hard x rays from laser-Thomson backscattering. Phys Rev Lett 2013; 111:114803. [PMID: 24074095 DOI: 10.1103/physrevlett.111.114803] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Indexed: 06/02/2023]
Abstract
Thomson backscattering of intense laser pulses from relativistic electrons not only allows for the generation of bright x-ray pulses but also for the investigation of the complex particle dynamics at the interaction point. For this purpose a complete spectral characterization of a Thomson source powered by a compact linear electron accelerator is performed with unprecedented angular and energy resolution. A rigorous statistical analysis comparing experimental data to 3D simulations enables, e.g., the extraction of the angular distribution of electrons with 1.5% accuracy and, in total, provides predictive capability for the future high brightness hard x-ray source PHOENIX (photon electron collider for narrow bandwidth intense x rays) and potential gamma-ray sources.
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Affiliation(s)
- A Jochmann
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden - Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany and Technische Universität Dresden, 01062 Dresden, Germany
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18
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Marx B, Schulze KS, Uschmann I, Kämpfer T, Lötzsch R, Wehrhan O, Wagner W, Detlefs C, Roth T, Härtwig J, Förster E, Stöhlker T, Paulus GG. High-precision x-ray polarimetry. Phys Rev Lett 2013; 110:254801. [PMID: 23829740 DOI: 10.1103/physrevlett.110.254801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Indexed: 06/02/2023]
Abstract
The polarization purity of 6.457- and 12.914-keV x rays has been improved to the level of 2.4×10(-10) and 5.7×10(-10). The polarizers are channel-cut silicon crystals using six 90° reflections. Their performance and possible applications are demonstrated in the measurement of the optical activity of a sucrose solution.
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Affiliation(s)
- B Marx
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany.
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19
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Gumberidze A, Thorn DB, Fontes CJ, Najjari B, Zhang HL, Surzhykov A, Voitkiv A, Fritzsche S, Banaś D, Beyer H, Chen W, DuBois RD, Geyer S, Grisenti RE, Hagmann S, Hegewald M, Hess S, Kozhuharov C, Märtin R, Orban I, Petridis N, Reuschl R, Simon A, Spillmann U, Trassinelli M, Trotsenko S, Weber G, Winters DFA, Winters N, Yu D, Stöhlker T. Electron- and proton-impact excitation of hydrogenlike uranium in relativistic collisions. Phys Rev Lett 2013; 110:213201. [PMID: 23745869 DOI: 10.1103/physrevlett.110.213201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Indexed: 06/02/2023]
Abstract
The K shell excitation of H-like uranium (U(91+)) in relativistic collisions with different gaseous targets has been studied at the experimental storage ring at GSI Darmstadt. By performing measurements with different targets as well as with different collision energies, we were able to observe for the first time the effect of electron-impact excitation (EIE) process in the heaviest hydrogenlike ion. The large fine-structure splitting in H-like uranium allowed us to unambiguously resolve excitation into different L shell levels. State-of-the-art calculations performed within the relativistic framework which include excitation mechanisms due to both protons (nucleus) and electrons are in good agreement with the experimental findings. Moreover, our experimental data clearly demonstrate the importance of including the generalized Breit interaction in the treatment of the EIE process.
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Affiliation(s)
- A Gumberidze
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
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20
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Plateau GR, Geddes CGR, Thorn DB, Chen M, Benedetti C, Esarey E, Gonsalves AJ, Matlis NH, Nakamura K, Schroeder CB, Shiraishi S, Sokollik T, van Tilborg J, Toth C, Trotsenko S, Kim TS, Battaglia M, Stöhlker T, Leemans WP. Low-emittance electron bunches from a laser-plasma accelerator measured using single-shot x-ray spectroscopy. Phys Rev Lett 2012; 109:064802. [PMID: 23006273 DOI: 10.1103/physrevlett.109.064802] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 02/15/2012] [Indexed: 05/11/2023]
Abstract
X-ray spectroscopy is used to obtain single-shot information on electron beam emittance in a low-energy-spread 0.5 GeV-class laser-plasma accelerator. Measurements of betatron radiation from 2 to 20 keV used a CCD and single-photon counting techniques. By matching x-ray spectra to betatron radiation models, the electron bunch radius inside the plasma is estimated to be ~0.1 μm. Combining this with simultaneous electron spectra, normalized transverse emittance is estimated to be as low as 0.1 mm mrad, consistent with three-dimensional particle-in-cell simulations. Correlations of the bunch radius with electron beam parameters are presented.
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Affiliation(s)
- G R Plateau
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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21
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Märtin R, Weber G, Barday R, Fritzsche Y, Spillmann U, Chen W, DuBois RD, Enders J, Hegewald M, Hess S, Surzhykov A, Thorn DB, Trotsenko S, Wagner M, Winters DFA, Yerokhin VA, Stöhlker T. Polarization transfer of bremsstrahlung arising from spin-polarized electrons. Phys Rev Lett 2012; 108:264801. [PMID: 23004992 DOI: 10.1103/physrevlett.108.264801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Indexed: 06/01/2023]
Abstract
We report on a study of the polarization transfer between transversely polarized incident electrons and the emitted x rays for electron-atom bremsstrahlung. By means of Compton polarimetry we performed for the first time an energy-differential measurement of the complete properties of bremsstrahlung emission related to linear polarization, i.e., the degree of linear polarization as well as the orientation of the polarization axis. For the high-energy end of the bremsstrahlung continuum the experimental results for both observables show a high sensitivity on the initial electron spin polarization and prove that the polarization orientation is virtually independent of the photon energy.
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Affiliation(s)
- R Märtin
- Helmholtz-Institut Jena, 07743 Jena, Germany
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22
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Vorobjev G, Sokolov A, Thorn A, Herfurth F, Kester O, Quint W, Stöhlker T, Zschornack G. Demonstration of charge breeding in a compact room temperature electron beam ion trap. Rev Sci Instrum 2012; 83:053302. [PMID: 22667612 DOI: 10.1063/1.4719668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
For the first time, a small room-temperature electron beam ion trap (EBIT), operated with permanent magnets, was successfully used for charge breeding experiments. The relatively low magnetic field of this EBIT does not contribute to the capture of the ions; single-charged ions are only caught by the space charge potential of the electron beam. An over-barrier injection method was used to fill the EBIT's electrostatic trap with externally produced, single-charged potassium ions. Charge states as high as K(19+) were reached after about a 3 s breeding time. The capture and breeding efficiencies up to 0.016(4)% for K(17+) have been measured.
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Affiliation(s)
- G Vorobjev
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany.
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23
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Maiorova AV, Tel’nov DA, Shabaev VM, Zaitsev VA, Tupitsyn II, Plunien G, Stöhlker T. The coulomb glory effect in collisions of antiprotons with heavy ions. Russ J Phys Chem B 2012. [DOI: 10.1134/s1990793112020200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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Hessling T, Blažević A, Frank A, Kraus D, Roth M, Schaumann G, Schumacher D, Stöhlker T, Hoffmann DHH. Time- and spectrally resolved measurements of laser-driven hohlraum radiation. Phys Rev E Stat Nonlin Soft Matter Phys 2011; 84:016412. [PMID: 21867327 DOI: 10.1103/physreve.84.016412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Indexed: 05/31/2023]
Abstract
At the GSI Helmholtz center for heavy-ion research combined experiments with heavy ions and laser-produced plasmas are investigated. As a preparation to utilize indirectly heated targets, where a converter hohlraum provides thermal radiation to create a more homogeneous plasma, this converter target has to be characterized. In this paper the latest results of these measurements are presented. Small spherical cavities with diameters between 600 and 750 μm were heated with laser energies up to 30 J at 532-nm wavelength. Radiation temperatures could be determined by time-resolved as well as time-integrated diagnostics, and maximum values of up to 35 eV were achieved.
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Affiliation(s)
- T Hessling
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
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25
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Weber G, Bräuning H, Surzhykov A, Brandau C, Fritzsche S, Geyer S, Hagmann S, Hess S, Kozhuharov C, Märtin R, Petridis N, Reuschl R, Spillmann U, Trotsenko S, Winters DFA, Stöhlker T. Direct determination of the magnetic quadrupole contribution to the Lyman-α₁ transition in a hydrogenlike ion. Phys Rev Lett 2010; 105:243002. [PMID: 21231522 DOI: 10.1103/physrevlett.105.243002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Indexed: 05/30/2023]
Abstract
We report the observation of an interference between the electric dipole (E1) and the magnetic quadrupole (M2) amplitudes for the linear polarization of the Ly-α1 (2p3/2→1s1/2) radiation of hydrogenlike uranium. This multipole mixing arises from the coupling of the ion to different multipole components of the radiation field. Our observation indicates a significant depolarization of the Ly-α1 radiation due to the E1-M2 amplitude mixing. It proves that a combined measurement of the linear polarization and of the angular distribution enables a very precise determination of the ratio of the E1 and the M2 transition amplitudes and the corresponding transition rates without any assumptions concerning the population mechanism for the 2p3/2 state.
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Affiliation(s)
- G Weber
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
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26
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Reed MW, Cullen IJ, Walker PM, Litvinov YA, Blaum K, Bosch F, Brandau C, Carroll JJ, Cullen DM, Deo AY, Detwiller B, Dimopoulou C, Dracoulis GD, Farinon F, Geissel H, Haettner E, Heil M, Kempley RS, Knöbel R, Kozhuharov C, Kurcewicz J, Kuzminchuk N, Litvinov S, Liu Z, Mao R, Nociforo C, Nolden F, Plass WR, Prochazka A, Scheidenberger C, Steck M, Stöhlker T, Sun B, Swan TPD, Trees G, Weick H, Winckler N, Winkler M, Woods PJ, Yamaguchi T. Discovery of highly excited long-lived isomers in neutron-rich hafnium and tantalum isotopes through direct mass measurements. Phys Rev Lett 2010; 105:172501. [PMID: 21231037 DOI: 10.1103/physrevlett.105.172501] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Indexed: 05/30/2023]
Abstract
A study of cooled ¹⁹⁷Au projectile-fragmentation products has been performed with a storage ring. This has enabled metastable nuclear excitations with energies up to 3 MeV, and half-lives extending to minutes or longer, to be identified in the neutron-rich nuclides ¹⁸³(,)¹⁸⁴(,)¹⁸⁶Hf and ¹⁸⁶(,)¹⁸⁷Ta. The results support the prediction of a strongly favored isomer region near neutron number 116.
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Affiliation(s)
- M W Reed
- Department of Physics, University of Surrey, Guildford, United Kingdom.
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27
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Thorn DB, Geddes CGR, Matlis NH, Plateau GR, Esarey EH, Battaglia M, Schroeder CB, Shiraishi S, Stöhlker T, Tóth C, Leemans WP. Spectroscopy of betatron radiation emitted from laser-produced wakefield accelerated electrons. Rev Sci Instrum 2010; 81:10E325. [PMID: 21034023 DOI: 10.1063/1.3479118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
X-ray betatron radiation is produced by oscillations of electrons in the intense focusing field of a laser-plasma accelerator. These hard x-rays show promise for use in femtosecond-scale time-resolved radiography of ultrafast processes. However, the spectral characteristics of betatron radiation have only been inferred from filter pack measurements. In order to achieve higher resolution spectral information about the betatron emission, we used an x-ray charge-coupled device to record the spectrum of betatron radiation, with a full width at half maximum resolution of 225 eV. In addition, we have recorded simultaneous electron and x-ray spectra along with x-ray images that allow for a determination of the betatron emission source size, as well as differences in the x-ray spectra as a function of the energy spectrum of accelerated electrons.
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Affiliation(s)
- D B Thorn
- ExtreMe Matter Institute, 64291 Darmstadt, Germany
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28
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Trotsenko S, Kumar A, Volotka AV, Banaś D, Beyer HF, Bräuning H, Fritzsche S, Gumberidze A, Hagmann S, Hess S, Jagodziński P, Kozhuharov C, Reuschl R, Salem S, Simon A, Spillmann U, Trassinelli M, Tribedi LC, Weber G, Winters D, Stöhlker T. Spectral shape of the two-photon decay of the 2 1S0 state in he-like tin. Phys Rev Lett 2010; 104:033001. [PMID: 20366639 DOI: 10.1103/physrevlett.104.033001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2008] [Revised: 08/04/2009] [Indexed: 05/29/2023]
Abstract
The spectral distribution of the 1s2s {1}S{0}-->1s{2} 1S0 two-photon decay of He-like tin was measured using a novel approach at the gas-jet target of the ESR storage ring. Relativistic collisions of Li-like projectiles with low-density gaseous matter have been exploited to selectively populate the desired 1s2s state. Compared to conventional techniques, this approach results in a substantial gain in statistical and systematic accuracy, which allowed us to achieve for the first time a sensitivity to relativistic effects on the two-photon decay spectral shape as well as to discriminate the measured spectrum for Sn from theoretical shapes for different elements along the He-isoelectronic sequence.
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Affiliation(s)
- S Trotsenko
- Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany
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29
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Spillmann U, Bräuning H, Hess S, Beyer H, Stöhlker T, Dousse JC, Protic D, Krings T. Performance of a Ge-microstrip imaging detector and polarimeter. Rev Sci Instrum 2008; 79:083101. [PMID: 19044330 DOI: 10.1063/1.2963046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Using 98% linearly polarized radiation at the European Synchrotron Radiation Facility in Grenoble, the performance of a prototype two-dimensional microstrip Ge(i) detector for x-ray imaging and as a Compton polarimeter has been evaluated. Using the energy and position sensitivity of the detector, the ability to obtain a complete reconstruction of the Compton event has been demonstrated. The modulation coefficient of the polarimeter is in good agreement with the theoretical limit of a perfect detector.
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Affiliation(s)
- U Spillmann
- 1Gesellschaft für Schwerionenforschung mbH, Planckstr. 1, 64291 Darmstadt, Germany
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30
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Brandau C, Kozhuharov C, Harman Z, Müller A, Schippers S, Kozhedub YS, Bernhardt D, Böhm S, Jacobi J, Schmidt EW, Mokler PH, Bosch F, Kluge HJ, Stöhlker T, Beckert K, Beller P, Nolden F, Steck M, Gumberidze A, Reuschl R, Spillmann U, Currell FJ, Tupitsyn II, Shabaev VM, Jentschura UD, Keitel CH, Wolf A, Stachura Z. Isotope shift in the dielectronic recombination of three-electron ANd57+. Phys Rev Lett 2008; 100:073201. [PMID: 18352547 DOI: 10.1103/physrevlett.100.073201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Indexed: 05/26/2023]
Abstract
Isotope shifts in dielectronic recombination spectra were studied for Li-like (A)Nd(57+) ions with A=142 and A=150. From the displacement of resonance positions energy shifts deltaE(142 150)(2s-2p(1/2))=40.2(3)(6) meV [(stat)(sys)] and deltaE(142 150)(2s-2p(3/2))=42.3(12)(20) meV of 2s-2p(j) transitions were deduced. An evaluation of these values within a full QED treatment yields a change in the mean-square charge radius of (142 150)deltar(2)=-1.36(1)(3) fm(2). The approach is conceptually new and combines the advantage of a simple atomic structure with high sensitivity to nuclear size.
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Affiliation(s)
- C Brandau
- Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany.
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31
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Litvinov YA, Bosch F, Geissel H, Kurcewicz J, Patyk Z, Winckler N, Batist L, Beckert K, Boutin D, Brandau C, Chen L, Dimopoulou C, Fabian B, Faestermann T, Fragner A, Grigorenko L, Haettner E, Hess S, Kienle P, Knöbel R, Kozhuharov C, Litvinov SA, Maier L, Mazzocco M, Montes F, Münzenberg G, Musumarra A, Nociforo C, Nolden F, Pfützner M, Plass WR, Prochazka A, Reda R, Reuschl R, Scheidenberger C, Steck M, Stöhlker T, Torilov S, Trassinelli M, Sun B, Weick H, Winkler M. Measurement of the beta+ and orbital electron-capture decay rates in fully ionized, hydrogenlike, and heliumlike 140Pr ions. Phys Rev Lett 2007; 99:262501. [PMID: 18233571 DOI: 10.1103/physrevlett.99.262501] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2007] [Indexed: 05/25/2023]
Abstract
We report on the first measurement of the beta+ and orbital electron-capture decay rates of 140Pr nuclei with the simplest electron configurations: bare nuclei, hydrogenlike, and heliumlike ions. The measured electron-capture decay constant of hydrogenlike 140Pr58+ ions is about 50% larger than that of heliumlike 140Pr57+ ions. Moreover, 140Pr ions with one bound electron decay faster than neutral 140Pr0+ atoms with 59 electrons. To explain this peculiar observation one has to take into account the conservation of the total angular momentum, since only particular spin orientations of the nucleus and of the captured electron can contribute to the allowed decay.
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Affiliation(s)
- Yu A Litvinov
- Gesellschaft für Schwerionenforschung GSI, Planckstrasse 1, 64291 Darmstadt, Germany
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32
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Nofal M, Hagmann S, Stöhlker T, Jakubassa-Amundsen DH, Kozhuharov C, Wang X, Gumberidze A, Spillmann U, Reuschl R, Hess S, Trotsenko S, Banas D, Bosch F, Liesen D, Moshammer R, Ullrich J, Dörner R, Steck M, Nolden F, Beller P, Rothard H, Beckert K, Franczak B. Radiative electron capture to the continuum and the short-wavelength limit of electron-nucleus bremsstrahlung in 90A MeV U88 + ((1s2)(2s2))+N2 Collisions. Phys Rev Lett 2007; 99:163201. [PMID: 17995248 DOI: 10.1103/physrevlett.99.163201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2007] [Indexed: 05/25/2023]
Abstract
We have measured the continuum momentum distribution for radiative electron capture to the continuum (RECC) cusp electrons in 90A MeV U88+ + N2-->U88+ + N2 +* + ecusp(0 degrees ) + hnu (RECC) collisions. We demonstrate that x rays coincident with RECC cusp electrons originate from the short-wavelength limit of the electron-nucleus bremsstrahlung and explain the asymmetric cusp shape by comparison with theory within the relativistic impulse approximation.
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Affiliation(s)
- M Nofal
- Max Planck Institut für Kernphysik, D-69117 Heidelberg, Germany
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33
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Tashenov S, Stöhlker T, Banaś D, Beckert K, Beller P, Beyer HF, Bosch F, Fritzsche S, Gumberidze A, Hagmann S, Kozhuharov C, Krings T, Liesen D, Nolden F, Protic D, Sierpowski D, Spillmann U, Steck M, Surzhykov A. First measurement of the linear polarization of radiative electron capture transitions. Phys Rev Lett 2006; 97:223202. [PMID: 17155800 DOI: 10.1103/physrevlett.97.223202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2005] [Indexed: 05/12/2023]
Abstract
For radiative electron capture into the K shell of bare uranium ions, a study of the polarization properties has been performed. For this purpose a position sensitive germanium detector has been used as an efficient Compton polarimeter. This enabled us to measure the degree of linear polarization by analyzing Compton scattering inside the detector and to determine the orientation of the polarization plane. Depending on the observation angle and the beam energy used, the radiation is found to be linearly polarized by up to 80%. In all cases studied, the plane of polarization coincides with the collision plane. The results will be discussed in the context of rigorous relativistic calculations, showing that relativistic effects tend to lead to a depolarization of the radiation emitted.
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Affiliation(s)
- S Tashenov
- Gesellschaft für Schwerionenforschung 64291 Darmstadt, Germany and Institut für Kernphysik University of Frankfurt 60486 Frankfurt, Germany
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34
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Verma P, Mokler P, Bräuning-Demian A, Kozhuharov C, Bräuning H, Bosch F, Liesen D, Stöhlker T, Hagmann S, Chatterjee S, Gumberidze A, Reuschl R, Schöffler M, Spillmann U, Orsic Muthig A, Tachenov S, Stachura Z, Wahab M. Spectroscopy of superheavy quasimolecules. Radiat Phys Chem Oxf Engl 1993 2006. [DOI: 10.1016/j.radphyschem.2005.10.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Ohtsubo T, Bosch F, Geissel H, Maier L, Scheidenberger C, Attallah F, Beckert K, Beller P, Boutin D, Faestermann T, Franczak B, Franzke B, Hausmann M, Hellström M, Kaza E, Kienle P, Klepper O, Kluge HJ, Kozhuharov C, Litvinov YA, Matos M, Münzenberg G, Nolden F, Novikov YN, Portillo M, Radon T, Stadlmann J, Steck M, Stöhlker T, Sümmerer K, Takahashi K, Weick H, Winkler M, Yamaguchi T. Simultaneous measurement of beta- decay to bound and continuum electron states. Phys Rev Lett 2005; 95:052501. [PMID: 16090870 DOI: 10.1103/physrevlett.95.052501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2004] [Indexed: 05/03/2023]
Abstract
We report the first measurement of a ratio lambda(beta(b))/lambda(beta(c)) of bound-state ((lambda(beta(b))) and continuum-state (lambda(beta(c))) beta(-)-decay rates for the case of bare 207Tl81+ ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a 208Pb beam. After in-flight separation with the Brho-deltaE-Brho method, they were injected into the experimental storage-ring ESR at an energy of 400.5A MeV, stored, and electron cooled. The number of both the 207Tl81+ ions and their bound-state beta(-)-decay daughters, hydrogen-like 207Pb81+ ions, were measured as a function of storage time by recording their Schottky-noise intensities. The experimental result, lambda(beta(b))/lambda(beta(c)) = 0.188(18), is in very good agreement with the value of 0.171(1) obtained from theory employing spectra of allowed transitions.
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Affiliation(s)
- T Ohtsubo
- Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany
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36
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Gumberidze A, Stöhlker T, Banaś D, Beckert K, Beller P, Beyer HF, Bosch F, Hagmann S, Kozhuharov C, Liesen D, Nolden F, Ma X, Mokler PH, Steck M, Sierpowski D, Tashenov S. Quantum electrodynamics in strong electric fields: the ground-state Lamb shift in hydrogenlike uranium. Phys Rev Lett 2005; 94:223001. [PMID: 16090386 DOI: 10.1103/physrevlett.94.223001] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2004] [Indexed: 05/03/2023]
Abstract
X-ray spectra following radiative recombination of free electrons with bare uranium ions (U92+) were measured at the electron cooler of the ESR storage ring. The most intense lines observed in the spectra can be attributed to the characteristic Lyman ground-state transitions and to the recombination of free electrons into the K shell of the ions. Our experiment was carried out by utilizing the deceleration technique which leads to a considerable reduction of the uncertainties associated with Doppler corrections. This, in combination with the 0 degree observation geometry, allowed us to determine the ground-state Lamb shift in hydrogenlike uranium (U91+) from the observed x-ray lines with an accuracy of 1%. The present result is about 3 times more precise than the most accurate value available up to now and provides the most stringent test of bound-state quantum electrodynamics for one-electron systems in the strong-field regime.
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Affiliation(s)
- A Gumberidze
- Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
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37
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Gumberidze A, Stöhlker T, Banaś D, Beckert K, Beller P, Beyer HF, Bosch F, Cai X, Hagmann S, Kozhuharov C, Liesen D, Nolden F, Ma X, Mokler PH, Orsić-Muthig A, Steck M, Sierpowski D, Tashenov S, Warczak A, Zou Y. Electron-electron interaction in strong electromagnetic fields: the two-electron contribution to the ground-state energy in He-like uranium. Phys Rev Lett 2004; 92:203004. [PMID: 15169349 DOI: 10.1103/physrevlett.92.203004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2004] [Indexed: 05/24/2023]
Abstract
Radiative recombination transitions into the ground state of cooled bare and hydrogenlike uranium ions were measured at the storage ring ESR. By comparing the corresponding x-ray centroid energies, this technique allows for a direct measurement of the electron-electron contribution to the ionization potential in the heaviest He-like ions. For the two-electron contribution to the ionization potential of He-like uranium we obtain a value of 2248+/-9 eV. This represents the most accurate determination of two-electron effects in the domain of high-Z He-like ions, and the accuracy reaches already the size of the specific two-electron radiative QED corrections.
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Affiliation(s)
- A Gumberidze
- Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany and Institut für Kernphysik, University of Frankfurt, 60486 Frankfurt, Germany
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38
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Brandau C, Kozhuharov C, Müller A, Shi W, Schippers S, Bartsch T, Böhm S, Böhme C, Hoffknecht A, Knopp H, Grün N, Scheid W, Steih T, Bosch F, Franzke B, Mokler PH, Nolden F, Steck M, Stöhlker T, Stachura Z. Precise determination of the 2s(1/2)-2p(1/2) splitting in very heavy lithiumlike ions utilizing dielectronic recombination. Phys Rev Lett 2003; 91:073202. [PMID: 12935014 DOI: 10.1103/physrevlett.91.073202] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2002] [Indexed: 05/24/2023]
Abstract
The 2s(1/2)-2p(1/2) energy splittings DeltaE(L) of the lithiumlike ions 19779Au76+, 20882Pb79+, and 23892U89+ have been measured at the Experimental Storage Ring, utilizing low energy dielectronic recombination. The resonance energies in total 41 different 1s(2) 2p(1/2)nl(j(')) (n > or =20) autoionizing Rydberg states populated in the dielectronic capture process have been determined. The 2s(1/2)-->2p(1/2) excitation energies have been obtained by extrapolation of these resonance energies to the associated series limits n--> infinity. The combined analysis of the experimental data for all three ions yields DeltaE(L)=216.134(96) eV for Au76+, 230.650(81) eV for Pb79+, and 280.516(99) eV for U89+.
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Affiliation(s)
- C Brandau
- Institut für Kernphysik, Justus-Liebig-Universität, D-35392 Giessen, Germany
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39
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Brandau C, Bartsch T, Hoffknecht A, Knopp H, Schippers S, Shi W, Müller A, Grün N, Scheid W, Steih T, Bosch F, Franzke B, Kozhuharov C, Mokler PH, Nolden F, Steck M, Stöhlker T, Stachura Z. High Rydberg resonances in dielectronic recombination of pb(79+). Phys Rev Lett 2002; 89:053201. [PMID: 12144440 DOI: 10.1103/physrevlett.89.053201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2001] [Indexed: 05/23/2023]
Abstract
Dielectronic recombination resonances of Pb (79+) associated with 2s(1/2)-->2p(1/2) excitations were measured at the heavy-ion storage ring ESR at GSI. The fine structure of the energetically lowest resonance manifold Pb (78+)(1s(2)2p(1/2)20l(j)) at around 18 eV could partially be resolved, and rate coefficients on an absolute scale were obtained. A comparison of the experimental data with results of a fully relativistic theoretical approach shows that high-angular-momentum components up to j=31/2 significantly contribute to the total resonance strength demonstrating the necessity to revise the widespread notion of negligible high-angular-momentum contributions at least for very highly charged ions.
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Affiliation(s)
- C Brandau
- Institut für Kernphysik, Justus-Liebig-Universität, D-35392 Giessen, Germany
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40
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Surzhykov A, Fritzsche S, Gumberidze A, Stöhlker T. Lyman- alpha(1) decay in hydrogenlike ions: interference between the E1 and M2 transition amplitudes. Phys Rev Lett 2002; 88:153001. [PMID: 11955194 DOI: 10.1103/physrevlett.88.153001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2001] [Indexed: 05/23/2023]
Abstract
For the Lyman- alpha(1) transition (2p(3/2)-->1s(1/2)) in hydrogenlike ions an interference between the leading E1 decay channel and the much weaker M2 multipole transition gives rise to a remarkable modified angular distribution of the emitted photons from aligned ions. This effect is most pronounced for the heaviest elements but results in a still sizable correction for medium- Z ions. For the particular case of hydrogenlike uranium where the angular distribution of the Lyman- alpha(1) x rays following radiative electron capture has been measured, the former variance with theoretical findings is removed when this E1-M2 interference is taken into account.
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Affiliation(s)
- A Surzhykov
- Universität Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany
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41
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Bräuning H, Mokler PH, Liesen D, Bosch F, Franzke B, Krämer A, Kozhuharov C, Ludziejewski T, Ma X, Nolden F, Steck M, Stöhlker T, Dunford RW, Kanter EP, Bednarz G, Warczak A, Stachura Z, Tribedi L, Kambara T, Dauvergne D, Kirsch R, Cohen C. Strong evidence for enhanced multiple electron capture from surfaces in 46 MeV/u Pb81+ collisions with thin carbon foils. Phys Rev Lett 2001; 86:991-994. [PMID: 11177992 DOI: 10.1103/physrevlett.86.991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2000] [Indexed: 05/23/2023]
Abstract
Strong evidence has been found for enhanced multiple electron capture into 46 MeV/u Pb81+ with a significant contribution from the entrance surface of thin carbon foils. Capture of up to five electrons has been observed. The multiple electron capture yield is found to increase with decreasing target thickness for thin targets. A simple model describing the data and showing the importance of capture from surfaces is discussed. Further evidence is found for a pronounced asymmetry between electron capture at the entrance and the exit surfaces. Absolute yields for multiple electron capture and projectile ionization are presented. The experimental total cross sections for single capture and ionization agree well with theory.
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Affiliation(s)
- H Bräuning
- Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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42
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Stöhlker T, Ma X, Ludziejewski T, Beyer HF, Bosch F, Brinzanescu O, Dunford RW, Eichler J, Hagmann S, Ichihara A, Kozhuharov C, Krämer A, Liesen D, Mokler PH, Stachura Z, Swiat P, Warczak A. Near-threshold photoionization of hydrogenlike uranium studied in ion-atom collisions via the time-reversed process. Phys Rev Lett 2001; 86:983-986. [PMID: 11177990 DOI: 10.1103/physrevlett.86.983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2000] [Indexed: 05/23/2023]
Abstract
Radiative electron capture, the time-reversed photoionization process occurring in ion-atom collisions, provides presently the only access to photoionization studies for very highly charged ions. By applying the deceleration mode of the ESR storage ring, we studied this process in low-energy collisions of bare uranium ions with low- Z target atoms. This technique allows us to extend the current information about photoionization to much lower energies than those accessible for neutral heavy elements in the direct reaction channel. The results prove that for high- Z systems, higher-order multipole contributions and magnetic corrections persist even at energies close to the threshold.
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Affiliation(s)
- T Stöhlker
- Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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43
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Bosch F, Faestermann T, Friese J, Heine F, Kienle P, Wefers E, Zeitelhack K, Beckert K, Franzke B, Klepper O, Kozhuharov C, Menzel G, Moshammer R, Nolden F, Reich H, Schlitt B, Steck M, Stöhlker T, Winkler T, Takahashi K. Observation of Bound-State beta - Decay of Fully Ionized 187Re: 187Re-187Os Cosmochronometry. Phys Rev Lett 1996; 77:5190-5193. [PMID: 10062738 DOI: 10.1103/physrevlett.77.5190] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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44
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Scheidenberger C, Geissel H, Mikkelsen HH, Nickel F, Czajkowski S, Folger H, Irnich H, Münzenberg G, Schwab W, Stöhlker T, Suzuki T, Voss B. Energy-Loss-Straggling Experiments with Relativistic Heavy Ions in Solids. Phys Rev Lett 1996; 77:3987-3990. [PMID: 10062359 DOI: 10.1103/physrevlett.77.3987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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45
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Beiersdorfer P, Elliott SR, Osterheld A, Stöhlker T, Autrey J, Brown GV, Smith AJ, Widmann K. Search for 1s2s 3S1-1s2p 3P2 decay in U90+. Phys Rev A 1996; 53:4000-4006. [PMID: 9913364 DOI: 10.1103/physreva.53.4000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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46
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Marrs RE, Elliott SR, Stöhlker T. Measurement of two-electron contributions to the ground-state energy of heliumlike ions. Phys Rev A 1995; 52:3577-3585. [PMID: 9912659 DOI: 10.1103/physreva.52.3577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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47
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Stöhlker T, Kozhuharov C, Mokler PH, Warczak A, Bosch F, Geissel H, Moshammer R, Scheidenberger C, Eichler J, Ichihara A, Shirai T, Stachura Z, Rymuza P. Radiative electron capture studied in relativistic heavy-ion-atom collisions. Phys Rev A 1995; 51:2098-2111. [PMID: 9911824 DOI: 10.1103/physreva.51.2098] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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48
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Stöhlker T, Geissel H, Irnich H, Kandler T, Kozhuharov C, Mokler PH, Münzenberg G, Nickel F, Scheidenberger C, Suzuki T, Kucharski M, Warczak A, Rymuza P, Stachura Z, Kriessbach A, Dauvergne D, Dunford B, Eichler J, Ichihara A, Shirai T. L-Subshell Resolved Photon Angular Distribution of Radiative Electron Capture into He-like Uranium. Phys Rev Lett 1994; 73:3520-3523. [PMID: 10057404 DOI: 10.1103/physrevlett.73.3520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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49
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Scheidenberger C, Geissel H, Mikkelsen HH, Nickel F, Brohm T, Folger H, Irnich H, Magel A, Mohar MF, Münzenberg G, Pfützner M, Roeckl E, Schall I, Schardt D, Schmidt K, Schwab W, Steiner M, Stöhlker T, Sümmerer K, Vieira DJ, Voss B, Weber M. Direct observation of systematic deviations from the Bethe stopping theory for relativistic heavy ions. Phys Rev Lett 1994; 73:50-53. [PMID: 10056717 DOI: 10.1103/physrevlett.73.50] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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50
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Stöhlker T, Mokler PH, Beckert K, Bosch F, Eickhoff H, Franzke B, Jung M, Kandler Y, Klepper O, Kozhuharov C, Moshammer R, Nolden F, Reich H, Rymuza P, Spädtke P, Steck M. Ground-state Lamb shift for hydrogenlike uranium measured at the ESR storage ring. Phys Rev Lett 1993; 71:2184-2187. [PMID: 10054609 DOI: 10.1103/physrevlett.71.2184] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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