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 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.Comment: LaTeX file with text: 7 pages; 2 gzipped *.ps files with figure