Pairing, temperature, and deformed-shell effects on the properties of superdeformedDy152nucleus

The existence of superdeformed shell closures together with pairing and the nuclear temperature effects are shown to explain the originally unexpected properties of the superdeformed band observed up to I∼60ħ in the ${}_{}{}^{152}{}_{}{}^{}\mathrm{Dy}$ nucleus. No parameters were adjusted to the superdeformed band properties. Population, and depopulation of the superdeformed bands, the moments of inertia, and side feeding properties are discussed and qualitatively understood. The use of the free-energy calculation results and the microcanonical ensemble formulation of the level-density problem at high-spin are proposed and discussed.