  The method used to investigate the cluster structures of excited states for
the light nuclei He, Li and Be in three-body photodisintegration processes is
described. As an application we present the experimental program on the Yerevan
synchrotron for the photodisintegration of 7Li target, the production and decay
of the 6He isotope and the study of the two-cluster (tritons) structures of
excited states. In particular, the properties of the detectors used in the
setup, as well as the precision and simulation of the measured values are
presented.
