Speaker
Description
The radiative strength function (RSF), defined as the average electromagnetic transition probability per unit of $\gamma$-ray energy $E_\gamma$, is an important quantity to study the nuclear reaction properties such as emission rate, cross section, and nuclear astrophysical processes. We proposed a new method to describe the RSF within a microscopic approach, which is based on the damping of phonon in the framework of the giant resonances. The pairing correlation is also taken into account via the exact thermal pairing solution. The obtained results show that not only the contribution of the giant dipole resonance (GDR) but also the Pygmy dipole resonance (PDR) in the RSF are well described in the new model. Moreover, the temperature of hot nuclei has a significant contribution to the RSF below neutron separation energy, questioning again the validity of the Brink-Axel hypothesis in this energy region.
