Similarity of nuclear structure in the 132Sn and 208Pb regions: Proton-neutron multiplets

Starting from the striking similarity of proton-neutron multiplets in 134 Sb and 210 Bi, we perform a shell-model study of nuclei with two additional protons or neutrons to find out to what extent this analogy persists. We employ effective interactions derived from the CD-Bonn nucleon-nucleon potential renormalized by use of the V low-k approach. The calculated results for 136 Sb , 212 Bi, 136 I, and 212 At are in very good agreement with the available experimental data. The similarity between 112 Sn and 208 Pb regions is discussed in connection with the effective interaction, emphasizing the role of core polarization effects.

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