Predictions of synthesizing elements with $Z=119$ and 120 in fusion reactions

Within the framework of the dinuclear system model, the experimentally accessible projectile-target combinations are predicted for the production of new superheavy elements with $Z=119$ and $Z=120$. The entrance channel effect and the isotopic dependence of targets and projectiles on the capture, fusion, and survival stages of the fusion reaction are discussed. The reactions ${}_{45}\mathrm{Sc}+{}_{249}\mathrm{Cf}$ and ${}_{50}V + {}_{246}\mathrm{Cm}$ are found to be promising candidates for the synthesis of the element with $Z=119$, achieving the maximal evaporation residue cross sections of 0.288 pb at an incident energy of 211.2 MeV and 0.237 pb at an incident energy of 226.2 MeV, respectively. Meanwhile, the element with $Z=120$ can be synthesized through the reaction ${}_{46}\mathrm{Ti} + {}_{249}\mathrm{Cf}$ with a maximal evaporation residue cross section of 0.040 pb at 221.8 MeV.