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The difference between observed cross sections of the evaporation residues(ER) of the $^{34}$S+$^{208}$Pb and $^{36}$S+$^{206}$Pb reactions formed in the2n and 3n channels has been explained by two reasons related with the entrancechannel characteristics of these reactions. The first reason is that thecapture cross section of the latter reaction is larger than the one of the$^{34}$S+$^{208}$Pb reaction since the nucleus-nucleus potential is moreattractive in the $^{36}$S+$^{206}$Pb reaction due to two more neutrons inisotope $^{36}$S. The second reason is the difference in the heights of theintrinsic fusion barrier $B^*_{\rm fus}$ appearing on the fusion trajectory bynucleon transfer between nuclei of the DNS formed after the capture. The valueof $B^*_{\rm fus}$ calculated for the $^{34}$S+$^{208}$Pb reaction is higherthan the one obtained for the $^{36}$S+$^{206}$Pb reaction. This fact has beencaused by the difference between the $N/Z$-ratios in the light fragments of theDNS formed during the capture in these reactions. The $N/Z$-ratio has beenfound by solution of the transport master equations for the proton and neutrondistributions between fragments of the DNS formed at capture with the differentinitial neutron numbers $N=18$ and $N=20$ for the reactions with the $^{34}$Sand $^{36}$S, respectively.

european physical journal. a, hadrons and nuclei

The effect of the neutron and proton numbers ratio in colliding nuclei  at formation of the evaporation residues in the $^{34}$S+$^{208}$Pb and  $^{36}$S+$^{206}$Pb reactions