Giant dipole resonance built on hot rotating nuclei produced during evaporation of light particles from the Mo 88 compound nucleus

High-energy giant dipole resonance (GDR) γ rays were measured following the decay of the hot, rotating
compound nucleus of 88Mo, produced at excitation energies of 124 and 261 MeV. The reaction 48Ti+ 40Ca at 300
and 600 MeV bombarding energies has been used. The data were analyzed using the statistical modelMonte Carlo
code GEMINI++. It allowed extracting the giant dipole resonance parameters by fitting the high-energy γ -ray
spectra. The extracted GDR widths were compared with the available data at lower excitation energy and with
theoretical predictions based on (i) The Lublin-Strasbourg drop macroscopic model, supplemented with thermal
shape fluctuations analysis, and (ii) The phonon damping model. The theoretical predictions were convolutedwith
the population matrices of evaporated nuclei from the statistical model GEMINI++. Also a comparison with the
results of a phenomenological expression based on the existing systematics, mainly for lower temperature data,
is presented and discussed. A possible onset of a saturation of the GDR width was observed around T = 3 MeV.