TRANSVERSE FORM-FACTORS IN THE COLLECTIVE AND SYMPLECTIC MODELS

Transverse electron scattering form factors are calculated for O+ --> 2(+) excitations in O-16, Mg-24 and Ca-40, The objective is to learn a bout the current flows associated with nuclear collective motions. The 2(+) states considered in O-6 and Ca-40 are giant quadrupole vibratio nal excitations. In Mg-24, the 2(+) state is the first excited rotatio nal state. The form factors have been computed microscopically within the framework of the symplectic model and, in order to interpret the d ynamical content of collective flows of the model, the results are com pared with form factors calculated with collective models, for differe nt collective flows. For the giant resonance state, we calculate the f orm factor for irrotational-flow vibrational motion and, for the rotat ional state, we use the rotor model with both rigid and irrotational c urrent Rows. (C) 1997 Elsevier Science B.V.