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 qasifission 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 Ua nd 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]
Fission fragment mass distributions were measured in heavy-ion induced fissions using 238U target nucleus
A calculation based on a fluctuation dissipation model reproduced the mass distributions and their incident energy dependence
Summary
Experiments to produce superheavy nuclei (SHN) have been carried out by using heavy-ion fusion and evaporation reactions [1,2,3]. Evaporation residue cross sections were calculated with a statistical model in the reactions of 30Si +238 U and 34S +238 U using the obtained fusion probability in the entrance channel. We studied the orientation effects on fusion and/or quasifission by measuring the fission fragment mass distributions.
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