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 ${}^{48}$Ca+${}^{144,154}$Sm and ${}^{16}$O+${}^{186}$W 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 ${}^{48}$Ca+${}^{154}$Sm 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 ${}^{48}$Ca+${}^{154}$Sm at the large collision energies and the lack of quasifission fragments in the ${}^{48}$Ca+${}^{144}$Sm 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 ${}^{54}$Cr+${}^{248}$Cm reaction is preferable in comparison with the ${}^{58}$Fe+${}^{244}$Pu and ${}^{64}$Ni+${}^{238}$U 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.

arXiv comment27 pages, 12 figures, submitted to Phys. Rev. C

References in corpus (2)

• 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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