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Results are presented on shape coexistence effects in the nucleus 78 Kr obtained within the complex version of the EXCITED VAMPIR variational approach. Oblate-prolate coexistence and mixing is found to be responsible for the characteristic features identified at low excitation energy for low and intermediate as well as high spins. At the highest investigated spins, the high density of configurations having different deformations results in the fragmentation of B(E2) strengths explaining the experimentally identified forking of the spectrum. The present investigation indicates the essential role played by particular neutron-proton matrix elements of the effective interaction on the oblate-prolate coexistence and mixing in the 78 Kr nucleus.

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