Investigation of the quasifission process by theoretical analysis of experimental data of fissionlike reaction products

Abstract

The fusion excitation function is the important quantity in planning experiments for the synthesis of superheavy elements. Its values seem to be determined by the experimental study of the hindrance to complete fusion by the observation of mass, angular and energy distributions of the fissionlike fragments. There is ambiguity in establishment of the reaction mechanism leading to the observed binary fissionlike fragments. The fissionlike fragments can be produced in the quasifission, fast fission, and fusion-fission processes which have overlapping in the mass (angular, kinetic energy) distributions of fragments. The branching ratio between quasifission and complete fusion strongly depends on the characteristics of the entrance channel. In this paper we consider a wide set of reactions (with different mass asymmetry and mass symmetry parameters) with the aim to explain the role played by many quantities on the reaction mechanisms. We also present the results of study of the ${}^{48}$Ca+${}^{249}$Bk reaction used to synthesize superheavy nuclei with Z = 117 by the determination of the evaporation residue cross sections and the effective fission barriers $<B_{\mathrm{f}}>$ of excited nuclei formed along the de-excitation cascade of the compound nucleus.

21 pages, 15 figures, 2 tables

References in corpus (6)

• Synthesis of superheavies: State of affairs and outlooks
• Quasifission and fusion-fission in massive nuclei reactions. Comparison of reactions leading to the Z=120 element
• Competition between fusion-fission and quasifission processes in the ${}^{32}$S+${}^{182,184}$W reactions
• Angular anisotropy of the fusion-fission and quasifission fragments
• Role of the target orientation angle and orbital angular momentum in the evaporation residue production
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Cited by in corpus (5)

• Investigation on the 48Ca+249-252Cf reactions synthesizing isotopes of the superheavy element 118
• An experimentalist's view of the uncertainties in understanding heavy element synthesis
• Uncertainties and understanding of experimental and theoretical results regarding reactions forming heavy and superheavy nuclei
• Synthetic Paths to the Heaviest Elements
• What perspectives for the synthesis of heavier superheavy nuclei? Results and comparison with models