Dissipative effects in the formation of the [Formula Presented]Er compound nucleus

Light-charged particles were measured in coincidence with evaporation residues for [Formula Presented]C+[Formula Presented]Sm, [Formula Presented]Cl+[Formula Presented]Sb, and [Formula Presented]Ni+[Formula Presented]Zr reactions which populate the compound nucleus [Formula Presented]Er at the same excitation energy. The particle spectral shape for [Formula Presented]C+[Formula Presented]Sm is harder than the other two reactions. A one-body dissipation model predicts that the fusion times for the [Formula Presented]Cl- and [Formula Presented]Ni-induced reactions are similar and are about twice as long as that of the [Formula Presented]C-induced reaction. Statistical model calculations considering particle evaporation during compound nucleus formation successfully reproduce the particle spectra for all the reactions.