Predictions for decay modes for superheavy nuclei $Z=118–124$

To study whether long-lived superheavy nuclei could really exist around $Z=120$ and $N=184$, the competition between $\alpha$ decay and spontaneous fission in the region $104\le Z\le 124$ are systemically studied. The $\alpha$-decay half-lives are investigated by employing a generalized liquid drop model and the analytical universal decay law formula. The calculation of spontaneous fission half-lives are carried out based on generalized Swiatecki's formula. The competition between $\alpha$ decay and spontaneous fission is analyzed in detail and the decay modes are predicted for the unknown nuclei.

Figure 1

$Z=124$, $A=301–312$ decay chain calculated by the UDL formula and GLDM to $\alpha$-decay half-lives and two formulas to spontaneous fission half-lives.

Figure 2

$Z=123$, $A=300–311$ decay chain calculated by the UDL formula and GLDM to $\alpha$-decay half-lives and two formulas to spontaneous fission half-lives..

Figure 3

${}^{295,296,309,310}122$, ${}^{294,295,308,309}121$, and ${}^{289,290,307,308}120$ decay chains calculated by the UDL formula and GLDM to $\alpha$-decay half-lives and two formulas to spontaneous fission half-lives.

Figure 4

${}^{288,289,306,307}119$ and ${}^{283,284,305,306}118$ decay chains calculated by the UDL formula and GLDM to $\alpha$-decay half-lives and two formulas to spontaneous fission half-lives.