SCALING PROPERTIES OF THE GIANT-DIPOLE RESONANCE WIDTH IN HOT ROTATING NUCLEI

We study the systematics of the giant dipole resonance width Gamma in hot rotating nuclei as a function of temperature T, spin J, and mass A . We compare available experimental results with theoretical calculati ons that include thermal shape fluctuations in nuclei ranging from A = 45 to A = 208. Using the appropriate scaled variables, we find a simp le phenomenological function Gamma(A,T,J) which approximates the globa l behavior of the giant dipole resonance width in the liquid drop mode l. We reanalyze recent experimental and theoretical results for the re sonance width in Sn isotopes and Pb-208.