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Evaporation Residue (ER) cross-sections and ER-gated $\gamma$-ray folddistributions are measured for the $^{32}$S + $^{154}$Sm nuclear reaction abovethe Coulomb barrier at six different beam energies from 148 to 191 MeV.$\gamma$-ray multiplicities and spin distributions are extracted from theER-gated fold distributions. The ER cross-sections measured in the present workare found to be much higher than what was reported in a previous work using avery different target-projectile ($^{48}$Ti + $^{138}$Ba) combination, leadingto the same compound nucleus $^{186}$Pt, with much less mass asymmetry in theentrance channel than the present reaction. This clearly demonstrates theeffect of the entrance channel on ER production cross-section. The ERcross-sections measured in the present work are compared with the results ofboth the statistical model calculations and the dynamical model calculations.Statistical model calculations have been performed to generate a range ofparameter space for both the barrier height and Kramers' viscosity parameterover which the ER cross-section data can be reproduced. The calculationsperformed using the dinuclear system (DNS) model reproduce the data consideringboth complete and incomplete fusion processes. DNS calculations indicate theneed for the inclusion of incomplete fusion channel at higher energies toreproduce the ER cross-sections.

Measurements of evaporation residue cross-sections and evaporation residue-gated $\gamma$-ray fold distributions for $^{32}$S+$^{154}$Sm system