Abstract
The transition rates of ΔL=0 - transitions in the lightest Po isotopes are considerably slower than the transition rates of the heavier ones, even leading to a considerable deviation in the classical Geiger-Nuttall plot. Evidence will be given that due to particle-hole excitations through the Z=82 proton shell, the groundstate of the lighter Po isotopes becomes deformed and direct - decay to the spherical groundstate of the corresponding Pb isotopes is highly retarded.
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Huyse, M., Andreyev, A., Van de Vel, K. et al. Anomalies in the α-Decay Energies and Half-Lives of Neutron-Deficient Po Isotopes. Hyperfine Interactions 132, 141–146 (2001). https://doi.org/10.1023/A:1011997806824
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DOI: https://doi.org/10.1023/A:1011997806824