Low energy 0+ excitations in 158Gd
  High precision (p,t) studies of the deformed nucleus 158Gd allowed the observation of 13 excited 0+ states below an excitation energy of 3.1 MeV. This high density of low energy states, and particularly their measured B(E2) transition strengths to the first excited 2+ state challenge nuclear models. The pseudo SU(3) model, which successfully describes many excited bands in Dy isotopes, is used to analyze this nuclei. We have fairly good reproduction of most of the states but the absence of actively including nucleons occupying intruders orbits may be the reason for the observed limitations of the model. 
Jorge G. Hirsch, Gabriela Popa, Shelly R. Lesher, Ani Aprahamian,   Carlos E. Vargas, and Jerry P. Draayer