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Investigation of the Giant Monopole Resonance in the Cd and Pb Isotopes : The Asymmetry Term in Nuclear Incompressibility and the MEM Effect

The giant monopole resonance (GMR) has been investigated in the even-A Cd and Pb isotopes 112−124Cd, and 204−208Pb, with the aim of obtaining a confirmatory “experimental” value for the asymmetry term in nuclear incompressibility, Kτ , and to test the Mutual Enhancement Magicity (MEM) effect in nuclear incompressibilities. The latter was advanced as a possible explanation of the puzzling “softness” of the Sn and Cd nuclei, as evidenced by their low GMR energies as compared to theoretical predictions. The GMR results in the Cd isotopes give a value Kτ = −490± 100 MeV, in close agreement with the value obtained previously from the Sn isotopes. Our results rule out the MEM effect as an explanation of the aforementioned “softness” observed for the Sn and Cd nuclei.