Abstract
Abstract Fission fragment mass distributions were measured in the heavy-ion induced fission using 238 U target nucleus. The mass distribu- tions changed drastically with incident energy. The results are explained by a change of the ratio between fusion and qasifission with nuclear orientation. A calculation based on a fluctuation dissipation model reproduced the mass distributions and their inci- dent energy dependence. Fusion probability was determined in the analysis. Evaporation residue cross sections were calculated with a statistical model in the reactions of 30 Si+ 238 U and 34 S+ 238 U using the obtained fusion probability in the entrance channel. The results agree with the measured cross sections of 263,264 Sg and 267,268 Hs, produced by 30 Si+ 238 U and 34 S+ 238 U, respectively. It is also suggested that the sub-barrier energies can be used for heavy element synthesis.
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