Multifragmentation and Flow: Peripheral vs. central collisions

Document Type

Article

Publication Date

2-6-1995

Publication Source

Nuclear Physics A

Volume Number

583

Issue Number

1

First Page

553

Last Page

560

Publisher

Elsevier

Abstract

Multifragment decays of heavy nuclei have been studied at the ALADIN spectrometer system at beam energies between 100 and 1000 MeV per nucleon. The observed fragment distributions signal a universality of spectator decays at bombarding energies . The role of the radial flow for the fragmentation process is explored by comparing fragment distributions measured for Au+Au collisions at in central collisions and at in more peripheral reactions. At both energies the maximum multiplicity of intermediate mass fragments (IMFs) normalized to the size of the decaying system is about one IMF per 30 nucleons but the element distributions show significant differences. Within a coalescence picture the suppression of heavy fragments in central collisions at may be related to a reduction of the density in momentum space which is caused by a large collective expansion velocity component.

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