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The properties of deexcitation of the same $^{220}$Th compound nucleus (CN)formed by different mass (charge) asymmetric reactions are investigated. It isdemonstrated that the effective fission barrier $<B_{\rm fis}>$ value being afunction of the excitation energy $E^*_{\rm CN}$ is strongly sensitive to thevarious orbital angular momentum $L=\ell\hbar$ distributions of CN formed withthe same excitation energy $E^*_{CN}$ by the very different entrance channels$^{16}$O+$^{204}$Pb, $^{40}$Ar+$^{180}$Hf, $^{82}$Se+$^{138}$Ba and$^{96}$Zr+$^{124}$Sn. Consequently, the competition between the fission andevaporation of light particles (neutron, proton, and $\alpha$-particle)processes along the deexcitation cascade of CN depends on the orbital angularmomentum distribution of CN. Therefore, the ratio between the evaporationresidue cross sections obtained after emission of neutral and charged particlesand neutrons only for the same CN with a given excitation energy $E^*_{CN}$ issensitive to the mass (charge) asymmetry of reactants in the entrance channel.

Effects of entrance channels on the deexcitation properties of the same compound nucleus formed by different pairs of collision partners