Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 13: Poster-Sitzung: Theorie
HK 13.5: Poster
Dienstag, 18. März 2003, 13:30–15:30, Foyer
Breakup of 9Be by a molecular single-particle effect in reactions around the Coulomb barrier: its effect on complete fusion — •Alexis Diaz-Torres1, Ian Thompson2, and Werner Scheid1 — 1Institut fuer Theoretische Physik der Justus-Liebig-Universitaet Giessen, 35392 Giessen, Germany — 2Physics Department, University of Surrey, Guildford Surrey GU2 7XH, UK
The dissociation of 9Be on 209Bi and 64Zn at energies just above the Coulomb barrier along with its effect on the complete fusion are studied within the two-center shell model approach. The dissociation of 9Be on 209Bi is caused by a molecular single-particle effect (Landau-Zener mechanism) before the nuclei reach the Coulomb barrier. Molecular single-particle effects do not occur at that stage of the collision for 9Be+64Zn, and this explains the absence of fusion suppression observed for this system. The polarisation of the energy level of the last neutron of 9Be and, therefore the existence of avoided crossings with that level, depends on the structure of the target.