Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 14: Postersitzung / Theorie
HK 14.46: Poster
Donnerstag, 23. März 2000, 10:15–12:45, B 113
Melting or nucleon transfer in fusion of heavy nuclei? — •A. Diaz-Torres1, G. Adamian1,2, N. Antonenko1,2, and W. Scheid1 — 1Institut für Theoretische Physik Uni. Gießen — 2Joint Institute for Nuclear Research, Dubna
Investigating the time-dependent transition between diabatic and adiabatic potentials in the entrance channel within the two-center shell model, we demonstrate that a structural forbiddenness exists for the motion of the nuclei to smaller internuclear distances in near symmetric dinuclear systems. This transition is slower than the quasifission. The system has not enough time for destroying the "memory" on the structural forbiddenness. Energy thresholds for the complete fusion in relevant collective variables show that the nuclei prefer to proceed in mass asymmetry coordinate to the compound nucleus. The comparison of the calculated fusion probabilities with experimental data supports the basic assumption of the dinuclear system concept that the nuclei do not directly melt together, but form the compound nucleus by nucleon transfer from the light nucleus to the heavy one.
Supported by DAAD(Bonn) and AvH–Stiftung(Bonn)