Abstract
Fission fragment mass distributions were measured in heavy-ion induced fissions using 238 U target nucleus. The measured 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 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 for seaborgium and hassium isotopes.
Highlights
Experiments to produce superheavy nuclei (SHN) have been carried out by using heavy-ion fusion and evaporation reactions [1,2,3]
We studied the orientation effects on fusion and/or quasifission by measuring the fission fragment mass distributions
Validity of the proposed method to determine ae-mail: nishio.katsuhisa@jaea.go.jp 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
Summary
Experiments to produce superheavy nuclei (SHN) have been carried out by using heavy-ion fusion and evaporation reactions [1,2,3]. We studied the orientation effects on fusion and/or quasifission by measuring the fission fragment mass distributions. Validity of the proposed method to determine ae-mail: nishio.katsuhisa@jaea.go.jp 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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