Comparison of Cd and Hg level structures with regard to shape coexistence and shell quenching

The lack of a drop in the excitation energy ratios and the anomaly of E( 2(+)) energies in the even A Cd isotopes near the r- process waiting point nuclei of Cd-130 also are observed in the even A Hg isotopes near Hg-206 with N = 126. Because shape coexistence exists in Hg isotopes, Cd isotopes near N = 82 are proposed to have a similar shape coexistence. In the present work, it is shown that the state mixing of ground and excited bands can reproduce level energies observed in Hg and Cd isotopes. Experimental Q beta values of Cd-130 and Sn-132 are on the extrapolated lines without unusual raising or lowering. Therefore, it is concluded that shape coexistence can explain band structures of neutron- rich Cd and Hg isotopes without any need for shell quenching.