Effects of the entrance channel and fission barrier in the synthesis of superheavy element Z=120

The fusion and evaporation residue cross sections for the 50Ti+249Cf and 54Cr+248Cm reactions calculated by the combined dinuclear system and advanced statistical models are compared. These reactions are considered to be used to synthesize the heaviest superheavy element. The 50Ti+249Cf reaction is more mass asymmetric than 54Cr+248Cm, and the fusion excitation function for the former reaction is higher than the one for the latter reaction. The evaporation residue excitation functions for the mass asymmetric reaction is higher in comparison with the one for the 54Cr+248Cm reaction. The use of the mass values of superheavy nuclei calculated in the framework of the macroscopic-microscopic model by the Warsaw Group [Muntian, Z. Patyk, and A. Sobiczewski, Phys. At. Nuclei 66, 1015 (2003)] leads to a smaller evaporation residue cross section for both the reactions in comparison with the case of using the masses calculated by Moeller and Nix [J. Phys. G: Nucl. Part. Phys. 20, 1681 (1994)]. The 50Ti+249Cf reaction is more favorable in comparison with the 54Cr+248Cm reaction: the maximum values of the excitation function of the 3n channel of the evaporation residue formation for the 50Ti+249Cf and 54Cr+248Cm reactions are about 0.1 and 0.07 pb, respectively, but the yield of the 4n channel for the former reaction is lower (0.004 pb) in comparison with the one (0.01 pb) for the latter reaction.