On the Double -Decay Width of the Quadrupole State: The Case of Sn.

We discuss the mixing of the simple and complex configurations of the giant dipole resonance for describing the double -decay width of the state of an even–even spherical nucleus. Using the model based on the Skyrme energy density functional, the large configuration space is taken into account. We make a prediction for the branching ratio of the competitive -decay relative to its single -decay for the case of the Sn region of the nuclear chart. [ABSTRACT FROM AUTHOR]