  The thermodynamics of the electromagnetic radiation from heated nuclei is
developed on basis of the Landau theory of a Fermi liquid [1]. The case of
non-spherical nuclei is considered, in which the quasiparticle energy spectrum
is not distorted by the residual interactions that affect the thermodynamic
behavior of the system. The number of quanta per cascade and mean-square
fluctuation are calculated; the $\gamma$-quantum spectrum of the whole cascade
is also obtained. The formulae can be used to determine the entropy and
temperature of the initial nucleus by various methods. The effective nucleon
(quasiparticle) mass in nuclear matter is determined by comparison with the
experimental data. The region of validity of the theory and some possibilities
of its extension on the basis of new experiments are discussed.
