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Using a covariant diagram technique and the concept of a nucleus as anelementary particle we calculated differential cross-sections for two-particlephotodisintegration reactions of the He-4. The only functional parameter wasthe vertex structure function, which described the "collapse" of a He-4 nucleusand the nucleon remnants. The interaction of a real photon was determined bythe value of particles charge, since the electromagnetic form factors werecalculated in the photon point. The inseparability property of the electriccharge from the particle mass allowed us to match the energy-momentum andcharge conservation laws in the interaction. Therefore, the requirement ofgauge symmetry was immediately satisfied. The covariant amplitude of theprocess equaled to the sum of pole diagrams and regular part.

Two-particle photodisintegration of He-4: He-4(gamma,d)d, He-4(gamma,p)T, He-4(gamma,n)He-3