Survival Probabilities of Compound Superheavy Nuclei Towards Element 119

TL;DR

This paper models the survival probabilities of superheavy nuclei, emphasizing the impact of triaxial deformation, and estimates optimal conditions for synthesizing element 119 and other new elements.

Contribution

It introduces a microscopic approach incorporating triaxial deformation effects to predict survival probabilities and optimal synthesis conditions for superheavy elements.

Findings

Triaxial deformation significantly lowers fission barriers in superheavy nuclei.

Predicted optimal energies and cross sections for synthesizing element 119.

Estimated reaction parameters for new element synthesis.

Abstract

To synthesize superheavy element 119 is becoming highly concerned as several experimental projects in major laboratories are being pursued. This work studied the survival probabilities of compound superheavy nuclei after multiple neutron emissions based on microscopic energy dependent fission barriers, demonstrating a significant role of triaxial deformation in decreasing the first fission barriers in the heaviest region. Together with the fusion cross sections by the dinuclear system model, the optimal energy and the residual cross section of $^{243}$Am($^{48}$Ca, 3$n$)$^{288}$Mc are reproduced. Finally the cross sections and optimal beam energies of $^{243}$Am+$^{54}$Cr and $^{249}$Bk+$^{50}$Ti reactions are estimated, providing clues for the synthesis of new elements.