Main restrictions in the synthesis of new superheavy elements: quasifission or/and fusion-fission

Abstract

The synthesis of superheavy elements stimulates the effort to study the peculiarities of the complete fusion with massive nuclei and to improve theoretical models in order to extract knowledge about reaction mechanism in heavy ion collisions at low energies. We compare the theoretical results of the compound nucleus (CN) formation and evaporation residue (ER) cross sections obtained for the ${}^{48}$Ca+${}^{248}$Cm and ${}^{58}$Fe+${}^{232}$Th reactions leading to the formation of the isotopes A=296 and A=290, respectively, of the new superheavy element Lv (Z=116). The ER cross sections, which can be measured directly, are determined by the complete fusion and survival probabilities of the heated and rotating compound nucleus. That probabilities can not be measured unambiguously but the knowledge about them is important to study the formation mechanism of the observed products. For this aim, the ${}^{48}$Ca+${}^{249}$Cf and ${}^{64}$Ni+${}^{232}$Th reactions have been considered too. The use of the mass values of superheavy nuclei calculated in the framework of the macroscopic-microscopic model by Warsaw group leads to smaller ER cross section for all of the reactions (excluding the ${}^{64}$Ni+${}^{232}$Th reaction) in comparison with the case of using the masses calculated by Peter Möller {\it et al}.

26 pages and 15 figures. arXiv admin note: text overlap with arXiv:1109.2013

References in corpus (7)

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• Theoretical study of the synthesis of superheavy nuclei with Z= 119 and 120 in heavy-ion reactions with trans-uranium targets
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Cited by in corpus (6)

• Analysis of the fusion mechanism in synthesis superheavy element 119 via ${}^{54}$Cr+${}^{243}$Am reaction
• Systematic study on probable projectile-target combinations for the synthesis of the ${}^{302}$120 superheavy nucleus
• Uncertainties and understanding of experimental and theoretical results regarding reactions forming heavy and superheavy nuclei
• Energy-Dependence of Nucleus-Nucleus Potential and Friction Parameter in Fusion Reactions
• A new dynamical mechanism of incomplete fusion in heavy-ion collision
• Role of charged particle emission on the evaporation residue formation in the ${}^{82}$Se+${}^{138}$Ba reaction leading to the ${}^{220}$Th compound nucleus