Abstract
The octupole deformations and other ground state properties of even-even Rn, Th and U isotopes are investigated systematically within the framework of the reflection asymmetric relativistic mean field (RAS-RMF) model. The calculation results reproduce the binding energies and the quadrupole deformations well. The calculation results indicate these nuclei at ground states evolve from nearly-spherical (N = 130) shape to quadrupole deformation shape with the increase of the neutron number. It is also found that among the Rn isotopes, only 222,224Rn are octupole deformed and the octupole deformations for them are small. However, more nuclei (N ≄ 134–148) in Th and U isotopes are octupole deformed and the octupole deformations for some of them are significant (|β3| ∼ 0.1 or even larger).
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