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Internal electron-positron pair production from electric monopole transitions

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

NuclearE0-transitions above the pair production threshold of ω=2m c 2∼1 MeV are considered. The rationη of the electron-positron pair creation probability to theK-shell conversion probability is calculated. For92U and ω=1,450 keV a typical value ofη=2·10− is obtained. Good agreement with experimental data is found. Our numerical results for finite size nuclei are compared with analytical expressions utilizing relativistic electron wavefunctions for point nuclei. The energy distributions of emitted positrons are presented for various nuclear charge values and transition energies. The possibility of monoenergetic positron emission is discussed. Of particular interest is the relation of the theoretical results to the recently observed structure in the positron spectra, which have been measured in high energy collisions of very heavy ions.

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Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Federal Republic of Germany

    Gerhard Soff

  2. Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Federal Republic of Germany

    Paul Schlüter & Walter Greiner

Authors
  1. Gerhard Soff
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  2. Paul Schlüter
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  3. Walter Greiner
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Additional information

Work supported by the Bundesministerium für Forschung und Technologie and by the Deutsche Forschungsgemeinschaft

We acknowledge very fruitful discussions with B. Müller, J. Reinhardt and C.S. Warke. We are grateful to Ch. Kozhuharov, F. Bosch and H. Bokemeyer for making their experimental results available to us prior to publication. One of us (G.S.) acknowledges the support of the Heisenberg Programm of the Deutsche Forschungsgemeinschaft.

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Soff, G., Schlüter, P. & Greiner, W. Internal electron-positron pair production from electric monopole transitions. Z Physik A 303, 189–198 (1981). https://doi.org/10.1007/BF01424758

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