Abstract

The widths of the residue-mass distributions are used as a measure of the excitation energy of hot nuclei. They increase with the recoil velocity but saturate much below the calculated velocity ${v}_{\mathrm{CN}}$ for complete fusion. Above these critical excitations energies (4.5--6.4 MeV/nucleon) derived from the recoil velocity, the normal evaporation of nucleons and small clusters disappears, if a hot and equilibrated compoundlike nucleus is formed at all.

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