Abstract
Fission fragment mass distributions were measured in heavy-ion induced fission of 238U. The mass distributions changed drastically with incident energy. The results are explained by a change of the ratio between fusion and quasifission with nuclear orientation. A calculation based on a fluctuation dissipation model reproduced the mass distributions and their incident energy dependence. Fusion probability was determined in the analysis. Evaporation residue cross sections were calculated with a statistical model for the reactions of 30Si+238U and 34S+238U using the obtained fusion probability in the entrance channel. The results agree with the measured cross sections of 263,264Sg and 267,268Hs, produced by 30Si+238U and 34S+238U, respectively. It is also suggested that sub-barrier energies can be used for heavy element synthesis.
Highlights
Experiments to produce superheavy nuclei (SHN) have been carried out by using heavy-ion fusion and evaporation reactions [1,2,3]
Validity of the proposed method to determine the fusion probability was confirmed by measuring the evaporation residue cross sections for seaborgium and hassium isotopes produced in the 30Si + 238U and 34S + 238U reactions, respectively
Fission fragment mass distributions in the reactions of 30Si, 31P, 34,36S, 40Ar, 48Ca + 238U were measured using beams supplied by the tandem accelerator of the Japan Atomic Energy Agency (JAEA) at Tokai
Summary
Experiments to produce superheavy nuclei (SHN) have been carried out by using heavy-ion fusion and evaporation reactions [1,2,3]. The second process, forming a compound nucleus (fusion probability, Pfus), is not well understood, and to understand this process is the subject of this research program. Validity of the proposed method to determine the fusion probability was confirmed by measuring the evaporation residue cross sections for seaborgium and hassium isotopes produced in the 30Si + 238U and 34S + 238U reactions, respectively
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