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The neutron-rich nuclei 130Cd and 206Hg, so important in the astrophysicalprocesses, may also be useful in tracking the evolution of nuclear shell gapsas one traverses the neutron-rich region. The high spin 8+ isomer in 130Cd andthe 10+ isomer in 206Hg turn out to be the lampposts, which may shed light onthe shell gaps and validity of the seniority scheme in the neutron-richsystems. We explore the robustness of the N=82 and N=126 magic numbers in theneutron-rich 130Cd and 206Hg nuclides, respectively. A parallel between the twonuclides in terms of the high-spin isomers allows us to investigate thesewaiting-point nuclei, which have limited experimental data, by using theconcept of seniority as the stepping stone. In this paper, we report largescale shell model calculations by using the available realistic effectiveinteractions derived from the Charge Dependent Bonn potential through therenormalized G matrix. We also explore if any change in the interaction is alsorequired to consistently explain both the level structures as well the B(E2)values. A structural similarity between the 8+ isomer in 130Cd and the 10+isomer in 206Hg is noticed due to goodness of seniority. They are found topossess a maximally aligned, seniority v = 2 configuration from theirrespective intruder orbits. No shell quenching seems to be needed for theseniority isomers in these nuclei. Therefore, N=82 and 126 appear to be veryrobust magic numbers even in the neutron-rich region.

Parallel tale of seniority isomers in 130Cd and 206Hg: Testing the robustness of magic numbers