Systematic study of probable projectile-target combinations for the synthesis of the superheavy nucleus (302)120

摘要

Probable projectile-target combinations for the synthesis of the superheavy element (302)120 have been studied taking the Coulomb and proximity potential as the interaction barrier. The probabilities of the compound nucleus formation P-CN for the projectile-target combinations found in the cold reaction valley of (302)120 are estimated. At energies near and above the Coulomb barrier, we have calculated the capture, fusion, and evaporation residue cross sections for the reactions of all probable projectile-target combinations so as to predict the most promising projectile-target combinations for the synthesis of the superheavy element (302)120 in heavy-ion fusion reactions. The calculated fusion and evaporation cross sections for the more asymmetric ("hotter") projectile-target combination is found to be higher than the less asymmetric ("colder") combination. It can be seen from the nature of the quasifission barrier height, mass asymmetry, the probability of compound nucleus formation, survival probability, and excitation energy, the systems Ar-44 + No-258, Ar-46 + No-256, Ca-48 + Fm-254, Ca-50 + Fm-252, Ti-54 + Cf-248, and Cr-58 + Cm-244 in deep region I of the cold reaction valley and the systems Fe-62 + Pu-240, Fe-64 + Pu-238, Ni-68 + U-234, Ni-70 + U-232, Ni-72 + U-230, and Zn-74 + Th-228 in the other cold valleys are identified as the better projectile-target combinations for the synthesis of (302)120. Our predictions on the synthesis of (302)120 superheavy nuclei using the combinations Cr-54 + Cm-248, Fe-58 + Pu-244, Ni-64 + U-238, and Ti-50 + Cf-249 are compared with available experimental data and other theoretical predictions.