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[en] We investigate the behaviour of the vacuum charge around a supercritical neucleus with Z > 137 in dependence in the nuclear radius. The screening effects are considered in a quasiclassical approximation. We show that in the point nucleus limit the nuclear charge is screened by the vacuum charge up to Z = 137. This means that the coupling strength of a point charge in QED cannot be larger than 1. The influence if the heavier leptons is also discussed. (orig.)
Journal
Zeitschrift fuer Physik. A, Atoms and Nuclei; ISSN 0340-2193; 
; v. 300(2/3); p. 143-155
; v. 300(2/3); p. 143-155