Survival Probabilities of Compound Superheavy Nuclei Towards Element 119

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.