E0 Transition Strengths in 70Se and 70Kr Mirror Nuclei within a Beyond-Mean-Field Model

The shape coexistence and mixing and the strengths of the E0 transitions in the mirror nuclei 70Se and 70Kr are investigated in the frame of the beyond-mean-field complex Excited Vampir model with variation after symmetry projection. The effective interaction is obtained renormalizing a nuclear matter G-matrix derived from the charge dependent Bonn CD potential in a rather large model space. The effects of shape mixing on the E0 transition strengths for the lowest few 0+, 2+, and 4+ states as well as the M1 and E2 strengths for the 2i+→2j+ and 4i+→4j+ transitions are presented and discussed.