On the nature of gamma-hadron family alignment

Analysis of experimental and simulated gamma -families calculated in QGS mo del revealed that two different mechanisms of strong interactions are respo nsible for the observed alignment of high energy gamma -rays in superfamili es. One of them relates to conventional QCD-jet production. Another one has a clear energy threshold behavior (E-0(th) greater than or similar to 8 Pe V) and manifests itself via alignment of 4-core cluster structures observed in superfamilies with SigmaE(gamma) greater than or equal to 700 TeV. Both mechanisms are characterized by large transverse momenta. A phenomenologic al model with energy threshold production of coplanar hadrons makes it poss ible to reproduce experimental fraction of aligned events.