Charge form factors and ALPHA-cluster internal structure of 12C

The transition densities and form factors of 0+,2+ and 3- states in 12C are calculated in alpha cluster model using the triangle frame with clusters in the vertices. The wave functions of nucleons in the alpha clusters are taken as they were obtained in the framework of the models used for the description of the 4He form factor and momentum distribution which are based on the one-body density matrix construction. They contain effects of the short-range NN-correlations, as well as the d-shell admixtures in 4He. Calculations and the comparison with the experimental data show that visible effects on the form and magnitude of the 12C form factors take place, especially at relatively large momentum transfers