München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 24: Kernphysik/Spektroskopie

HK 24.5: Vortrag

Dienstag, 21. März 2006, 18:15–18:30, C

Role of the clusterization of heavy nuclei for fusion reactions — •genevieve mouze — University of Nice, France

There is no need of a repulsive potential in the amalgamation stage for explaining the small fusion cross sections. The repulsive potential proposed by A. Adamian et al.(1) can advantageously be replaced by the affinity of the reaction of re-dissociation of the compound nucleus into its entrance-channel configuration. This reaction, which occurs after the penetration of the Coulomb barrier, is an equilibrium between dual and compact form of the compound nucleus. The energy Q released in the dissociation is equal to the energy required for amalgamating and is a measure of the fusion barrier. The total energy of the confined system being equal to the height B of the Coulomb barrier, the intrinsic excitation energy of the compact nucleus is equal to (B - Q).This energy decides on the number of emitted neutrons and on the remaining excitation energy after evaporation. This new, mass-data-based model of fusion is completely parameter-free. In fusions leading to superheavy nuclei the redissociation energy (clusterization) becomes extremely great and can be equal to B or greater than B: Thus new phenomena can be observed, e.g. cluster-fission (2). B -C , a kind of cluster-fission barrier, plays a major role for the feasibility of superheavy syntheses. (1): G.G. Adamian et al., PRC 69 (2004) 044601. (2): G. Mouze, Europhys. Lett. 58 (2002)362.