Research on α-decay for the superheavy nuclei with Z=118-120

The generalized liquid-drop model (GLDM) with the microscopic shell correction from relativistic Hartree-Fock (RHF) calculations is used to explore the alpha-decay of superheavy nuclei. The known nuclei with Z = 106 -118 are chosen as examples for testing. The calculated half-lives of alpha-decay agree with the experimental data better than those from the GLDM with the shell correction in the Weizsacker-Skyrme model. Moreover, the influence of the decay energy Q(alpha) on alpha-decay is investigated. It is determined that the Q(alpha) values obtained from the WS4 model with radial basis function (RBF) correction match the experimental data optimally. Owing to these advantages, the GLDM with the RHF shell correction and WS4+RBF Q(alpha) values is adopted to predict the alpha-decay life-time for the unknown superheavy nuclei with Z = 118 -120. The trend of the available alpha-decay half-lives according to the neutron number is similar to the trends of the values from the GLDM calculation without shell correction as well as the universal decay law (UDL) formula. Comparably, the RHF shell correction depresses (raises) the alpha-decay lifetime for most nuclei with N < 186 (N > 186). In comparison with the half-lives of spontaneous fission, it can be concluded that the alpha-decay is dominant in the superheavy nuclei (281-304)118, (284-306)119, and (287-308)120. These results are beneficial to the exploration of superheavy nuclei in experiments.

Automated summary

This study explores the alpha-decay of superheavy nuclei using the generalized liquid-drop model (GLDM) with microscopic shell correction from relativistic Hartree-Fock (RHF) calculations. The results show that the calculated alpha-decay half-lives agree better with experimental data than those from the GLDM with the shell correction in the Weizsacker-Skyrme model. The influence of the decay energy Q(alpha) on alpha-decay is also investigated, and it is found that the Q(alpha) values obtained from the WS4 model with radial basis function (RBF) correction match the experimental data optimally. The GLDM with RHF shell correction and WS4+RBF Q(alpha) values is adopted to predict the alpha-decay life-time for unknown superheavy nuclei with Z = 118-120. The trend of the available alpha-decay half-lives according to the neutron number is similar to the trends of the values from the GLDM calculation without shell correction as well as the universal decay law (UDL) formula.