α-decay studies of the exotic $N=125$, 126, and 127 isotones

The α-decay half-lives of the exotic $N=125$, 126, and 127 isotones (Po, Rn, Ra, Th, and U) are systematically studied by the density-dependent cluster model (DDCM). The influence of the neutron shell closure $N=126$ on the α-cluster formation and penetration probabilities is analyzed and discussed in detail. By combining the DDCM and a two-level microscopic model together, the experimental half-lives of α transitions to both the ground state and the excited state in the daughter nuclei are reproduced very well.

Figure 1

Schematic shell model description of the α decay of $N=125$ isotones.

Figure 2

Schematic shell model description of the α decay of $N=127$ isotones.