ENTRANCE CHANNEL DEPENDENT LIGHT CHARGED-PARTICLE EMISSION FROM THE ER-156 COMPOUND NUCLEUS

Light charged particle decay from the Er-156 compound nucleus, populat ed by C-12+Sm-144 and Ni-60+Zr-96 at the same excitation energy, were measured in coincidence with the evaporation residues. The high energy slope of charged particle spectra for the Ni-60-induced reaction is s teeper than for the C-12-induced reaction. Model calculations includin g particle evaporation during fusion result in good agreement with the data. This suggests that the difference in the charged particle spect ra between the two entrance channels is due to a longer formation rime in the Ni-60-induced reaction.