[en] The systematic study of the transverse momentum distributions of the multicharged fragments shows that the presence of high p_t tail distorts the distributions of fragments and the fragmentation model describes the features of these distributions only for p_t ≤ 500 MeV/c. Values of nuclear Fermi momentum obtained in the present experiment are in agreement with that of electron scattering experiment and the excitation energy observed in the order of binding energy per nucleon. Analysis of diffraction dissociation (¹²C → 3⁴He) events shows that the percentage of such type of events is 2.0 of the total inelastic collisions and such type of reaction goes through an intermediate ⁸Be state. 4 figs., 14 refs. (author)