Microscopic Description of $2\alpha$ Decay in $^{212}$Po and $^{224}$Ra Isotopes
Résumé
A microscopic calculation of half-lives for both the and decays of and is performed, using a self-consistent framework based on energy density functionals. A relativistic density functional and a separable pairing interaction of finite range are used to compute axially symmetric deformation energy surfaces as functions of quadrupole, octupole, and hexadecapole collective coordinates. Dynamical least-action paths are determined, that trace the and emission from the equilibrium deformation to the point of scission. The calculated half-lives for the decay of and are in good agreement with data. A new decay mode, the symmetric emission, is predicted with half-lives of the order of those observed for cluster emission.