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The evaporation residue yields from compound nuclei $^{220}$Th formed in the$^{16}$O+$^{204}$Pb, $^{40}$Ar+$^{180}$Hf, $^{82}$Se+$^{138}$Ba,$^{124}$Sn+$^{96}$Zr reactions are analyzed to study the entrance channeleffects by comparison of the capture, fusion and evaporation residue crosssections calculated by the combined dinuclear system (DNS) and advancedstatistical models. The difference between evaporation residue (ER) crosssections can be related to the stages of compound nucleus formation or/and atits surviving against fission. The sensitivity of the both stages in theevolution of DNS up to the evaporation residue formation to the angularmomentum of DNS is studied. The difference between fusion excitation functionsare explained by the hindrance to complete fusion due to the larger intrinsicfusion barrier $B^*_{\rm fus}$ for the transformation of the DNS into acompound nucleus and the increase of the quasifission contribution due to thedecreasing of quasifission barrier $B_{\rm qf}$ as a function of the angularmomentum. The largest value of the ER residue yields in the very massasymmetric $^{16}$O+$^{204}$Pb reaction is related to the large fusionprobability and to the relatively low threshold of the excitation energy of thecompound nucleus. Due to the large threshold of the excitation energy (35 MeV)of the $^{40}$Ar+$^{180}$Hf reaction, it produces less the ER yields than thealmost mass symmetric $^{82}$Se+$^{138}$Ba reaction having the lowest thresholdvalue (12 MeV).

Entrance channel effects on the evaporation residue yields in reactions leading to the $^{220}$Th compound nucleus