Abstract

The fragmentation of the system /sup 40/Ar+/sup 58/Ni into three heavy nuclei is studied at 15 MeV/nucleon bombarding energy. The kinematic quantities Z,E,p of the fragments are completely measured by three large ionization chambers. Employing a correlation analysis on the fragment momenta p, the fragmentation mechanism is shown to be a fast process. The data are in agreement with the assumption of a prompt breakup process competing with sequential fission, the latter being strongly influenced by the Coulomb residual interaction.

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