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

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Summary

Introduction

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.

Results
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