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The impact parameter dependence of the K MO X-ray emission in208Pb +208Pb collisions

1sσ- and 2p 1/2σ-excitation probabilities in symmetric, superheavy collision molecules

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The emission probabilities for quasimolecular K-x-radiation (K-MOR) have been measured in208Pb +208Pb collisions at 4.3 MeV/u and 4.8 MeV/u as a function of the scattering angle using the particle-photon-coincidence technique. The probabilities exhibit a superposition of two exponential slopes with different fall-off constants. We identify the sharp fall off at very small impact parameters (<60 fm) with the K-MOR contribution from the decay of 1sσ-vacancies. The flatter slope for impact parameters larger than 60 fm is attributed to the radiative decay of holes in 2p 1/2 σ molecular states. In this way, experimental “1sσ-MOR-emission probabilities” could be extracted and compared with theory. For 4.3 MeV/u the1sσ- and 2p 1/2 σ-excitation probabilities could also be determined and have been compared to coupled-channel calculations and to a scaling law for 1sσ excitation.

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Authors and Affiliations

  1. Institut für Kernphysik der Johann Wolfgang Goethe-Universität, Frankfurt/Main, Federal Republic of Germany

    K. E. Stiebing, H. Schmidt-Böcking, W. Schadt & K. Bethge

  2. Physikalisches Institut der Universität Heidelberg, Heidelberg, Federal Republic of Germany

    R. Schuch

  3. Gesellschaft für Schwerionenforschung, Darmstadt, Federal Republic of Germany

    P. H. Mokler, F. Bosch & D. Liesen

  4. Kansas State University, Manhattan, Kansas, USA

    S. Hagmann

  5. Rutgers University, New Brunswick, New Jersey, USA

    P. Vincent

Authors
  1. K. E. Stiebing
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  2. H. Schmidt-Böcking
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  3. W. Schadt
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  4. K. Bethge
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  5. R. Schuch
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  6. P. H. Mokler
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  7. F. Bosch
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  8. D. Liesen
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  9. S. Hagmann
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  10. P. Vincent
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Additional information

Work supported by Bundesministerium für Forschung und Technologie (BMFT)

One of us K.E. St. was kindly supported by a grant from the Fazit-Stiftung, gemeinnützige Verlagsgesellschaft mbH, Frankfurt, FRG. The good208Pb beam produced by the UNILAC operator staff is gratefully acknowledged. In addition the work of H. Folger in organizing the208Pb target production process is appreciated. Discussions with R. Anholt, P. Armbruster, B. Müller, U. Müller, J. Reinhardt, G. Soff and Th. de Reus were of great help. Th. de Reus also performed the coupled channel calculations.

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Stiebing, K.E., Schmidt-Böcking, H., Schadt, W. et al. The impact parameter dependence of the K MO X-ray emission in208Pb +208Pb collisions. Z Physik A 319, 239–251 (1984). https://doi.org/10.1007/BF01412536

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  • DOI: https://doi.org/10.1007/BF01412536

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