Investigation of fusion probabilities in the reactions with Cr52,54, Ni64 , and

Abstract

Background:The formation of superheavy nuclei in fusion reactions is suppressed by a competing quasifission process. The competition between the formation of the compound nucleus and the quasifission depends strongly on the reaction entrance channel. Purpose: The investigation of fission and quasifission processes in the formation of Z = 120 superheavy composite systems in the 52,54 Cr + 248 Cm and 68 Zn + 232 Th reactions, and their comparison with the 64 Ni + 238 U reaction at energies in the vicinity of the Coulomb barrier. Methods: Mass-energy distributions of fissionlike fragments formed in the reactions 52,54 Cr + 248 Cm and 68 Zn + 232 Th at energies near the Coulomb barrier were measured using the double-arm time-of-flight spectrometer CORSET. Results: Capture cross sections for the reactions under investigation were measured. The most probable fragment masses and total kinetic energies as well as their variances in dependence on the interaction energy were studied for asymmetric and symmetric fragments. The fusion probabilities were estimated from the analysis of massenergy distributions. Conclusions: The estimated fusion probability drops down by a factor of 10 3 in the 54 Cr + 248 Cm reaction compared to the reactions of 48 Ca ions with actinides. Among the studied reactions, the 54 Cr + 248 Cm is the most favorable one for the production of the superheavy element with Z = 120.

Supremacy of optimal beam energy for synthesis of superheavy elements

“…Here, the capture stage was handled by the dynamical model and the fusion stage was tackled by the advanced statistical approach. This result was confirmed recently by an experiment [29] too. Further, another application of the said DNS model [30] inferred that the reaction 50 T i + 249 Cf is more favorable than the reaction 54 Cr + 248 Cm.…”

Trends in particle and nuclei identification techniques in nuclear physics experiments

“…Typical studies explore fission-dynamics [56,57] or the separation of the binary products of fast reactions (e.g. deep-inelastic and quasi-fission) from those of fission [58,59], to get insight on the scission point configuration, e.g., deformation, mass asymmetry and dissipated energy. The compact size, light weight and easy-to-handle design of the TOF spectrometer makes it a portable solution and has recently been an important component of the experimental campaign performed at JYFL laboratory (Finland) focusing on the study of the ternary fission in heavy-ion-induced reactions and the fission modes in mercury isotopes.…”