Calculations of the α-decay properties of Z =120, 122, 124, 126 isotopes

The \\begin{document}$\\alpha$\\end{document} -decay properties of even-Z nuclei with Z = 120, 122, 124, 126 are predicted. We employ the generalized liquid drop model (GLDM), Royer\u0027s formula, and universal decay law (UDL) to calculate the \\begin{document}$\\alpha$\\end{document} -decay half-lives. By comparing the theoretical calculations with the experimental data of known nuclei from Fl to Og, we confirm that all the employed methods can reproduce the \\begin{document}$\\alpha$\\end{document} -decay half-lives well. The preformation factor \\begin{document}$P_{\\alpha}$\\end{document} and \\begin{document}$\\alpha$\\end{document} -decay energy \\begin{document}$Q_{\\alpha}$\\end{document} show that \\begin{document}$^{298,304,314,316,324,326,338,348}$\\end{document} 120, \\begin{document}$^{304,306,318,324,328,338}$\\end{document} 122, and \\begin{document}$^{328,332,340,344}$\\end{document} 124 might be stable. The \\begin{document}$\\alpha$\\end{document} -decay half-lives show a peak at Z = 120, N = 184, and the peak vanishes when Z = 122, 124, 126. Based on detailed analysis of the competition between \\begin{document}$\\alpha$\\end{document} -decay and spontaneous fission, we predict that nuclei nearby N = 184 undergo \\begin{document}$\\alpha$\\end{document} -decay. The decay modes of \\begin{document}$^{287-339}$\\end{document} 120, \\begin{document}$^{294-339}$\\end{document} 122, \\begin{document}$^{300-339}$\\end{document} 124, and \\begin{document}$^{306-339}$\\end{document} 126 are also presented.