Absence of entrance-channel effects in the high-energy γ-ray emission from Gd146

The γ decay of the giant dipole resonance has been studied with mass-symmetric and mass-asymmetric fusion-evaporation reactions similar to those for which entrance-channel effects were previously reported in the population of superdeformed bands. No entrance-channel effects have been observed in the high-energy γ-ray spectra associated with the decay of the Gd146 compound nucleus populated at an excitation energy of 82 MeV via the reactions Si30+Sn116 and Ge76+Ge70. The absence of entrance-channel effects in the present data set is well explained by dissipative collision calculations.