The levels in 74,76Kr were studied with in-beam γ-spectroscopy techniques and the β⁺ decay of ⁷⁶Rb. The energies of the 2₁⁺ states in 74,76Kr deviate from smooth behavior compared with the higher spin levels. The yrast cascade $B(E2)$'s are highly collective. The 74,76Kr ground states have unusually large deformation. The origin of this deformation and of shape coexistence in this region is described in terms of the protons driving the deformation.
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Piercey et al. (1981) studied this question.
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