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 calcul ation 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 for ce. Triaxial quadrupole deformations have been included. Implications upon the decay lifetime of the quasidegeneracy of the isomeric state a nd the one-phonon excitation in the first well are examined.