Synthesis of superheavy element 120 via 50Ti+ACf hot fusion reactions

Synthesis of superheavy element 120 in terms of the 50Ti+249-252Cf fusion-evaporation reactions is evaluated and discussed. It is found that the reactions of 250,251Cf(50Ti,3n)297,298120 and 251,252Cf(50Ti,4n)297,298120 are relatively favorable with the maximum evaporation-residue cross sections of 0.12, 0.09, 0.11, and 0.25 pb, respectively. However, 252Cf may be difficult to be target because its spontaneous fission will bring about serious background in the experiment. Fusion probabilities for different target-projectile combinations leading to the formation of surperheavy nucleus 302120 are estimated with the ''fusion-by-diffusion'' model and presented as a function of the Coulomb parameter Z1Z2/(A11/3+A21/3). Among the reactions 50Ti+252Cf, 54Cr+248Cm, 58Fe+244Pu, and 64Ni+238U, the reaction 50Ti+252Cf has the largest fusion probability. Synthesis of superheavy element 120 is of essential importance for determining whether the magic proton shell should be at Z=114 or at higher proton numbers Z=120-126. Therefore, the experiment to produce isotopes with Z=120 in the fusion reactions 50Ti+250,251Cf is of great interest.