Systematics on production of superheavy nuclei Z = 119-122 in fusion-evaporation reactions
Abstract
The fusion dynamics on the formation of superheavy nuclei is investigated thoroughly within the dinuclear system model. The Monte Carlo approach is implemented into the nucleon transfer process for including all possible orientations, at which the dinuclear system is assumed to be formed at the touching configuration of dinuclear fragments. The production cross sections of superheavy nuclei Cn, Fl, Lv, Ts and Og are calculated and compared with the available data from Dubna. The evaporation residue excitation functions in the channels of pure neutrons and charged particles are analyzed systematically. The combinations with 44Sc, 48,50Ti, 49,51V, 52,54Cr, 58,62Fe and 62,64Ni bombarding the actinide nuclides 238U, 244Pu, 248Cm, 247,249Bk, 249,251Cf, 252Es and 243Am are calculated for producing the superheavy elements with Z=119-122. It is found that the production cross sections sensitively depend on the neutron richness of reaction system. The structure of evaporation residue excitation function is related to the neutron separation energy and fission barrier of compound nucleus.