TY  - JOUR
A1  - Soff, Gerhard
A1  - Müller, Berndt
A1  - Rafelski, Johann
T1  - Precise values for critical fields in quantum electrodynamics
T2  - Zeitschrift für Naturforschung, A
N2  - A careful investigation of different corrections to binding energies of electrons in almost critical fields is performed. We investigate quantitatively the influence of the nuclear charge parameters, nuclear mass, degree of ionization on the value of the critical charge of the nucleus. Rather qualitative arguments are given to establish the contribution of the quantumelectrodynamic corrections, which are found to be small. Some phenomenological modifications of QED are quantitatively investigated and found to be of negligible influence on the value of the critical field. For heavy ion collisions with Z1+Z2>Zcr the critical separations between ions are given as results of precise solutions of the relativistic two coulomb center problem. Corrections due to electron-electron interaction are considered. We find (with present theoretical accuracy) Zcr=173±2, in the heavy ion collisions Rcr(U-U) = 34.7±2 fm and Rcr (U-Cf)=47.7±2 fm. We shortly consider the possibility of spontaneous muon production in muonic supercritical fields.
Y1  - 2014
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/73991
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-739912
SN  - 1865-7109
VL  - 29
IS  - 9
SP  - 1267
EP  - 1275
PB  - Verlag der Zeitschrift für Naturforschung
CY  - Tübingen
ER  -