Generator coordinate method calculation of the E2 decay lifetime of shape isomers in the actinide region

We apply the generator coordinate method in a fully microscopic calculation of the E2 decay lifetime of the shape isomeric states of U-236, U-238, and Pu-240. The basis states have been generated by constrained Hartree-Fock Bardeen-Cooper-Schrieffer calculations with the SkM* force. Triaxial quadrupole deformations have been included. Implications upon the decay lifetime of the quasidegeneracy of the isomeric state and the one-phonon excitation in the first well are examined.