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

Abstract

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 the 2n and 3n channels has been explained by two reasons related with the entrance channel characteristics of these reactions. The first reason is that the capture cross section of the latter reaction is larger than the one of the ${}^{34}$S+${}^{208}$Pb reaction since the nucleus-nucleus potential is more attractive in the ${}^{36}$S+${}^{206}$Pb reaction due to two more neutrons in isotope ${}^{36}$S. The second reason is the difference in the heights of the intrinsic fusion barrier $B_{\mathrm{fus}}^{\ast }$ appearing on the fusion trajectory by nucleon transfer between nuclei of the DNS formed after the capture. The value of $B_{\mathrm{fus}}^{\ast }$ calculated for the ${}^{34}$S+${}^{208}$Pb reaction is higher than the one obtained for the ${}^{36}$S+${}^{206}$Pb reaction. This fact has been caused by the difference between the $N/Z$-ratios in the light fragments of the DNS formed during the capture in these reactions. The $N/Z$-ratio has been found by solution of the transport master equations for the proton and neutron distributions between fragments of the DNS formed at capture with the different initial neutron numbers $N=18$ and $N=20$ for the reactions with the ${}^{34}$S and ${}^{36}$S, respectively.

arXiv comment22 pages, 13 figures

References in corpus (7)

• A program for coupled-channels calculations with all order couplings for heavy-ion fusion reactions
• Influence of entrance-channel magicity and isospin on quasi-fission
• Quasifission and fusion-fission in massive nuclei reactions. Comparison of reactions leading to the Z=120 element
• Investigation on the 48Ca+249-252Cf reactions synthesizing isotopes of the superheavy element 118
• Angular anisotropy of the fusion-fission and quasifission fragments
• Friction Coefficient for Deep-Inelastic Heavy-Ion Collisions
• Peculiarities of quasifission reactions in heavy ion collisions

Cited by in corpus (6)

• Analysis of the fusion mechanism in synthesis superheavy element 119 via ${}^{54}$Cr+${}^{243}$Am reaction
• Optimal colliding energy for the synthesis of superheavy element $Z$=119
• Potential roots of the deep sub-barrier heavy-ion fusion hindrance phenomenon
• Small cross section of the synthesis of darmstadtium in the ${}^{48}$Ca+${}^{232}$Th reaction
• Measurements of evaporation residue cross-sections and evaporation residue-gated $\gamma$-ray fold distributions for ${}^{32}$S+${}^{154}$Sm system
• Investigation of the formation of superheavy elements with atomic numbers 116 and 120 through ${}^{50}$Ti-induced reaction