Systematics on production of superheavy nuclei Z=119-122 in fusion-evaporation reactions

Authors：Niu, Fei; Chen, Peng-Hui; Feng, Zhao-Qing^*

Source：Nuclear Science and Techniques, 2021, 32(10): 103.

DOI：10.1007/s41365-021-00946-3

• Dinuclear system model
• Fusion-evaporation reactions
• Superheavy nuclei
• Cross sections

The fusion dynamics of the formation of superheavy nuclei were investigated thoroughly within the dinuclear system model. The Monte Carlo approach was implemented in the nucleon transfer process to include 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 were calculated and compared with the available data from Dubna. The evaporation residue excitation functions in the channels of pure neutrons and charged particles were systematically analyzed. The combinations of Sc-44, Ti-48;50, V-49;51, Cr-52;54, Fe-58;62, and N-62;64(i) bombarding the actinide nuclides U-238, Pu-244, Cm-248, Bk-247;249, Cf-249;251, Es-252, and Am-243 were calculated to produce the superheavy elements with Z = 119 - 122. We obtained that the production cross sections sensitively depend on the neutron richness of the reaction system. The structure of the evaporation residue excitation function is related to the neutron separation energy and fission barrier of the compound nucleus.