Electron Excitation and Positron Emission in Quasi-Molecular Collisions of very Heavy Ions

  • Gerhard Soff
  • Udo Müller
  • Theo de Reus
  • Paul Schlüter
  • J. Reinhardt
  • Berndt Müller
  • Walter Greiner

Abstract

In collisions of very heavy ions superheavy quasiatomic systems are created, where the electrons experience for a period T ~ 10−20S the combined nuclear charge Z = Zp + Zt of the projectile and the target. This offers us the possibility to extend our knowledge on atomic physics by about a factor of two concerning the nuclear charge number and by an order of magnitude concerning the binding energy of the strongest bound electron1–4). For Z > 173 the binding energy of the 1s-electron exceeds the pair production threshold of 2 mc2 ~ 1 MeV, which allows for a spontaneous emission of positrons. In heavy-ion collisions close to or slightly above the nuclear Coulomb barrier superheavy nuclear compound systems may be formed. The spectroscopy of the emitted 6-electrons and positrons in such scattering experiments is a sensitive tool for the investigation of the nuclear reaction mechanism and for the determination of the reaction time.

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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Gerhard Soff
    • 1
  • Udo Müller
    • 1
  • Theo de Reus
    • 2
  • Paul Schlüter
    • 2
  • J. Reinhardt
    • 2
  • Berndt Müller
    • 2
  • Walter Greiner
    • 2
  1. 1.Gesellschaft für Schwerionenforschung mbHDarmstadt 11West-Germany
  2. 2.Institut für Theoretische PhysikJohann Wolfgang Goethe-UniversitätFrankfurt am MainWest-Germany

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