$\alpha$-decay chains of superheavy ${}^{265-279}\mathrm{Mt}$ isotopes

The $\alpha$-decay chains of the isotopes ${}^{265-279}\mathrm{Mt}$ are predicted by comparing the $\alpha$ half-lives calculated within the Coulomb and proximity potential model for deformed nuclei of Santhosh et al. [Nucl. Phys. A 850, 34 (2011)] with the spontaneous fission half-lives using the shell-effect-dependent formula of Santhosh and Nithya [Phys. Rev. C 94, 054621 (2016)]. $\alpha$ half-lives also are calculated using different theoretical formalisms for comparison. The predicted half-lives and decay modes match well with the experimental results. The use of four different mass tables for calculating the $\alpha$- decay energies indicates that the mass table of Wang et al. [Chin. Phys. C 41, 030003 (2017)], which is based on the AME2016 atomic mass evaluation, is in better agreement with experimental results. The paper predicts long $\alpha$ chains from ${}^{265,267-269,271-273}\mathrm{Mt}$ with half-lives within experimental limits. The isotopes ${}^{274-276,278}\mathrm{Mt}$ exhibit 2α chains followed by spontaneous fission. The 2α chain of ${}^{266}\mathrm{Mt}$ and the 4α chain of ${}^{270}\mathrm{Mt}$ end with electron capture. The isotopes ${}^{277,279}\mathrm{Mt}$ decay via spontaneous fission. We hope that the paper will open up new areas in this field.

Figure 1

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{265,266}\mathrm{Mt}$ and their decay products.

Figure 2

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{267,268}\mathrm{Mt}$ and their decay products.

Figure 3

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{269,270}\mathrm{Mt}$ and their decay products.

Figure 4

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{271,272}\mathrm{Mt}$ and their decay products.

Figure 5

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{273,274}\mathrm{Mt}$ and their decay products.

Figure 6

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{275,276}\mathrm{Mt}$ and their decay products.

Figure 7

The comparison of the calculated $\alpha$-decay half-lives with the spontaneous fission half-lives for the isotopes ${}^{277,278}\mathrm{Mt}$ and their decay products.