An investigation of interplay between dissipation mechanisms in heated Fermi systems by means of radiative strength functions

A simple analytical expression for the gamma-decay strength function is der ived with microcanonical ensemble for initial excited states. The approach leads to both a non-aero limit of the strength function for vanishing gamma -ray energy and a partial breakdown of Brink hypothesis. It is shown that t he 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 fo r study of the interplay between different relaxation mechanisms of the col lective excitations.