Quasifission and fusion-fission in massive nuclei reactions. Comparison of reactions leading to the Z=120 element
Abstract
The yields of evaporation residues, fusion-fission and quasifission fragments in the 48Ca+144,154Sm and 16O+186W reactions are analyzed in the framework of the combined theoretical method based on the dinuclear system concept and advanced statistical model. The measured yields of evaporation residues for the 48Ca+154Sm reaction can be well reproduced. The measured yields of fission fragments are decomposed into contributions coming from fusion-fission, quasifission, and fast-fission. The decrease in the measured yield of quasifission fragments in 48Ca+154Sm at the large collision energies and the lack of quasifission fragments in the 48Ca+144Sm reaction are explained by the overlap in mass-angle distributions of the quasifission and fusion-fission fragments. The investigation of the optimal conditions for the synthesis of the new element Z=120 (A=302) show that the 54Cr+248Cm reaction is preferable in comparison with the 58Fe+244Pu and 64Ni+238U reactions because the excitation function of the evaporation residues of the former reaction is some orders of magnitude larger than that for the last two reactions.
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