Abstract
To investigate whether highly excited nuclei fragment instantaneously (multifragmentation) or undergo consecutive binary decays, we analyzed the velocity correlations of intermediate mass fragments (IMFs) by calculating the evaporating of the primordial hot fragments during the Coulomb expansion after a prompt multifragment breakup. Such a scenario can only explain the experimental data for the 18O + natAg at E/ A = 84 MeV if a very low breakup density ϱ breakup ⋍ 1 10 ϱ 0 is adopted. This leaves the question on the actual decay mechanism open and calls for more specific correlations studies involving several IMFs.
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