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The role of intruder configurations in the description of energy spectra andB(E2) values in the Pt region is analyzed. In particular, we study thedifferences between Interacting Boson Model calculations with or without theinclusion of intruder states in the even Pt nuclei $^{172-194}$Pt. As a result,it shows that for the description of a subset of the existing experimentaldata, i.e., energy spectra and absolute B(E2) values up to an excitation energyof about 1.5 MeV, both approaches seem to be equally valid. We explain thesesimilarities between both model spaces through an appropriate mapping. We pointout the need for a more extensive comparison, encompassing a data set as broad(and complete) as possible to confront with both theoretical approaches inorder to test the detailed structure of the nuclear wave functions.

The Pt isotopes: comparing the Interacting Boson Model with Configuration Mixing and the Extended Consistent-Q formalism