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.
This work was supported by the Bundesministerium für Forschung und Technologie (BMFT) and the Deutsche Forschungsgemeinschaft (DFG). One of us (G.S.) acknowledges the support of the DFG-Heisenberg Program.
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© 1983 Plenum Press, New York
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Soff, G. et al. (1983). Electron Excitation and Positron Emission in Quasi-Molecular Collisions of very Heavy Ions. In: Lutz, H.O., Briggs, J.S., Kleinpoppen, H. (eds) Fundamental Processes in Energetic Atomic Collisions. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3781-2_27
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