Shape coexistence from lifetime and branching-ratio measurements in 68,70Ni
Shape coexistence near closed-shell nuclei, whereby states associated with deformed shapes appear at relatively low excitation energy alongside spherical ones, is indicative of the rapid change in structure that Luncheon Napkins can occur with the addition or removal of a few protons or neutrons.Near 68Ni (Z=28, N=40), the identification of shape c