Temperature dependence of the giant dipole resonance in ${}^{120}\mathrm{Sn}$

Complete statistical model calculations including temperature- and spin-dependent theoretical strength functions of the giant dipole resonance (GDR) have been performed for the decay of excited ${}^{120}\mathrm{Sn}$ for the first time. Previous analyses of GDR data with theoretical models compared the centroid and full width at half maximum of the theoretical strength functions with the extracted GDR parameters. In the new approach presented, the entire shape of the strength functions is considered and the theoretical spectra obtained can be directly compared with the experiment. This analysis does not rely on the accuracy of extracting the GDR parameters and/or the nuclear temperature of one data point. The nature of the temperature dependence of the GDR in the hot ${}^{120}\mathrm{Sn}$ nucleus within the thermal fluctuation and collisional damping model is discussed in this new perspective.