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We study the spherical to prolate-deformed shape transition in $^{144-158}$Smand $^{146-160}$Gd isotopes with modern calculations beyond the mean field withthe Gogny D1S force. We compare the results with the shape-phase transitionpredicted by the collective hamiltonian model and with the experimental data.Our calculations do not support the existence of a first order phase transitionin these isotopic chains in the viewpoint of the Bohr hamiltonian neither theinterpretation of the nuclei N=90 as critical points.

Study of shape transitions in $N\sim90$ isotopes with beyond mean field calculations