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We support the proposed ground state rotational bands in  12  C,  16  O,  28  Si and  40  Ca by calculating the form factors for the electro-excitation within a simple model. The model introduces two parameters for the size and the surface thickness of these nuclei and allows for the prediction of the transition probabilities and form factors within the rotator model. The model unambiguously predicts the sequence of rotational levels 0 + , 3 +  , 4 +  ... for  16  O and  40  Ca, and 0  +  , 2  +  , 4  +  ... for  12  C and  28  Si in agreement with the experiment. The comparison of the calculated form factors with the experimental data shows excellent agreement in the cases  28  Si and  40  Ca and is less satisfactory in the cases  12  C and  16  O.

Form Factors for Rotational Levels in 12 C, 16 O, 28 Si and 40 Ca