Abstract
Evaporation residue cross sections for $^{19}\mathrm{F}+^{184}\mathrm{W}$ have been measured at beam energies in the range of 90--130 MeV using the Heavy Ion Reaction Analyzer at the Inter University Accelerator Centre. A new approach, based on Monte Carlo calculations, has been adopted for estimating evaporation residue (ER) transmission efficiency. The challenges in the detection of ERs caused by the presence of isomeric states with longer half-lives have been thoroughly discussed. Measured cross sections have been fitted with statistical model calculations treating the fission barrier as an adjustable parameter. Comparison with other neighboring systems with nearly similar entrance-channel mass asymmetry indicates the onset of instability in the compound nucleus ${}_{83}^{203}{\mathrm{Bi}}_{120}$ after crossing of the $Z=82$ shell.
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