Quasifission and fusion-fission lifetimes for successful and unsuccessful reactions to synthesise superheavy elements

We have systematically studied quasifission (QF) and fusion-fission (FF) lifetimes for heavy ion fusion reactions which were used in the synthesis of superheavy elements (SHEs) 104 to 118 as well as attempted to synthesise SHEs 119 and 120 using the DNS model. The dependence of QF on energy, angular momentum, entrance channel parameters, deformation parameters and orientation angles are studied. The study reveals that QF lifetimes are larger for the successful reactions than for the unsuccessful reactions. It is also observed that the study of FF lifetimes of both successful and unsuccessful reactions will not give any clue for the reason of failure of experiments to synthesise superheavy elements. It is also observed that the QF process can be controlled by the projectile of lightly deformed or spherical nuclei. The present study finds the importance in selecting the projectile-target combination for the synthesis of SHEs with Z = 119 and 120.

Automated summary

This study systematically investigates the lifetimes of quasifission and fusion-fission reactions in heavy ion fusion reactions used in the synthesis of superheavy elements. The DNS model is also used to attempt the synthesis of new superheavy elements. The study shows that the quasifission lifetimes are longer for successful reactions and shorter for unsuccessful reactions. Additionally, the study finds that the fusion-fission lifetimes do not provide any explanation for the failure of experiments to synthesize superheavy elements. It is also observed that the quasifission process can be controlled by selecting projectiles with lightly deformed or spherical nuclei. Furthermore, the study emphasizes the importance of selecting the appropriate projectile-target combination for the synthesis of SHEs with Z = 119 and 120.