Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Kernphysik / Spektroskopie

HK 41.9: Vortrag

Donnerstag, 13. März 2008, 18:45–19:00, 2G

New points of view on the various aspects of nuclear fission — Genevieve Mouze and •Christian Ythier — Faculte des Sciences, Universite de Nice,France

It can be shown that the symmetric,or bimodal, fission of 258Fm results from a kind of leak through the barrier created by the Coulomb energy of the fission products.Indeed,the total fission energy of the fragment pairs 128Sn-130Sn and 126Sn-132Sn is greater than the Coulomb barrier of these pairs; this explains the considerable fission yield at A about 129.This observation suggests a new description of binary fission and to define new types of fission barrier.In heavy nuclei, symmetric fission can be in competition with cluster-fission, also called quasi-fission. In superheavy nuclei, cluster-fission takes the place of symmetric fission.It can be shown that there exist two different modes of ternary fission.