Partitions in nuclear fragmentation
Résumé
Fragment partitions of fragmenting hot nuclei produced in central and semiperipheral collisions have been compared in the excitation energy region where radial collective expansion takes place. It is shown that, for a given total excitation energy per nucleon, the intensity of the radial collective energy fixes the degree of fragmentation (mean fragment multiplicity). It is also shown that the partitions, at a given total excitation energy per nucleon, are completely determined by the reduced fragment multiplicities (fragment multiplicities normalized to source size). Such observations emphasize the subtle role played by the radial collective expansion. They also represent a benchmark against which models describing the fragmentation process of finite systems should be tested.
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