Abstract
Excitation functions are measured for the fusion reactions 27Al+ 175Lu and 31P+ 169Tm leading to the isotopes 192–198Po. A comparison to the data for the reactions 100Mo + 92–100Mo shows that characteristics of the compound nucleus evaporation do not depend on the bombarding ion mass in the whole range of the entrance channel asymmetry up to the fully symmetrical systems. It is also shown that a satisfactory description of the experimental data is possible in the frame of the statistical deexcitation model only at an assumption involving, in comparison to theory predictions, a considerable reduction of macroscopic fission barriers for neutron-deficient isotopes of Bi.
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