Abstract
Self-consistent calculations of the potential-energy surfaces for triaxial quadrupole deformations have been performed for 15 proton-rich cadmium and samarium isotopes. The light Cd isotopes show the expected transition towards spherical nuclei near the doubly magic $^{100}\mathrm{Sn}$ nucleus. Proton-rich Sm isotopes are strongly deformed whereas a region of \ensuremath{\gamma} instability is found around $^{138}\mathrm{Sm}$ and explained by a shell structure at N=76.
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