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References
The idea of intermediate superheavy molecules has first been mentioned by the authors in various GSI-seminars 1969-70, seee.g. GSI-Berichte 72-7, 72-10.
J. Rafelski, L. P. Fulcher andW. Greiner:Phys. Rev. Lett.,27, 958 (1971).
B. Müller, H. Peitz, J. Rafelski andW. Greiner:Phys. Rev. Lett.,28, 1235 (1972).
B. Müller, J. Rafelski andW. Greiner:Zeits. Phys.,257, 62 (1972).
B. Müller, J. Rafelski andW. Greiner:Zeits. Phys.,257, 183 (1972).
Experimental indications for superheavy molecules in heavy-ion collisions have been given byP. H. Mokler, P. Armbruster andH. J. Stein:Phys. Rev. Lett.,29, 827 (1972) and byF. H. Saris et al.: Proceedings of the Atlanta Conference on Atomic Spectroscopy (1972).
G. Soff, J. Rafelski andW. Greiner:Phys. Rev. A,7, 903 (1973).
The energyless creation of e+-e− pairs in over-critical fields has been first suggested byW. Pieper andW. Greiner:Zeits. Phys.,218, 327 (1969); and later byV. S. Popov:Žurn. Ėksp. Teor. Fiz.,32, 526 (1971). See also the review ofY. B. Zel’dovich andV. S. Popov:Sov. Phys. Usp.,14, 673 (1972).
B. Müller: Ph. D. Thesis, Institut für Theoretische Physik der Universität Frankfurt am Main (1972/73).
H. Peitz: Diploma Thesis, Institut für Theoretische Physik der Universität Frankfurt am Main (1972).
F. S. Stephens, R. Diamond, B. Povh andP. Kienle: Lawrence Berkeley Laboratory, Berkeley, Cal., private communication.
Such sharply peaked excitation functions can also be expected for the 2p-1s spontaneous γ-transitions (proportional to (ΔE)2) of the intermediate superheavy molecules in heavy-ion collisions. Because of the same reasons as given here, the width of this excitation function is much smaller than the crude collision time would suggest. In both cases of γ-transitions and positron autoionization, however, the spontaneous emission can be enhanced by induced emission due to the dynamics (deviations from adiabaticity). The dependence of the latter on transition energies will be more thoroughly investigated in a forthcoming article byK. Smith, P. Riesenfeld et al.
J. V. Noble:Nucl. Phys.,187 A, 568 (1972).
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This work has been supported by the Deutsche Forschungsgemeinschaft, by the Bundesministerium für Forschung und Technologie and by the Gesellschaft für Schwerionen-Forschung (GSI).
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Peitz, H., Müller, B., Rafelski, J. et al. Autoionization spectra of positrons in heavy-ion collisions. Lett. Nuovo Cimento 8, 37–42 (1973). https://doi.org/10.1007/BF02727627
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DOI: https://doi.org/10.1007/BF02727627