  A simple analytical expression for the gamma-decay strength function is
derived with microcanonical ensemble for initial excited states. The approach
leads to both a non-zero limit of the strength function for vanishing gamma-ray
energy and a partial breakdown of Brink hypothesis. It is shown that the low
energy behaviour of the gamma-decay strength functions is governed by the
energy behavior of the damping width. It may provides a new tool for study of
the interplay between different relaxation mechanisms of the collective
excitations.
