Speaker
Description
Nuclear level densities (NLDs) and the giant dipole resonance (GDR) encode complementary aspects of nuclear many-body dynamics and provide the microscopic structural input for compound-nucleus reactions. A consistent microscopic description of both quantities within a unified relativistic framework remains essential for understanding their structural origin and predictive power.
In this contribution, we present a systematic study of GDR properties within covariant density functional theory (CDFT). The electric dipole response is calculated using the relativistic quasiparticle random phase approximation (RQRPA) built on self-consistent relativistic Hartree–Bogoliubov (RHB) ground states. From the resulting E1 strength distributions, global GDR parameters are extracted across isotopic chains. In order to facilitate a direct comparison with experimental photoabsorption data, a tiny smearing approximation （TSA) method is employed, preserving the microscopic structure of the response while accounting for the finite width of the resonance. The deformation dependence and shell evolution of the dipole strength are analyzed in a fully self-consistent manner.
Microscopic nuclear level densities are constructed within the RHB+combinatorial framework based on the underlying quasiparticle spectra. This approach allows us to investigate in detail the impact of pairing correlations and shell structure on the excitation spectrum, in particular the role of quasiparticle gaps and their evolution with neutron number and intrinsic deformation.
Finally, the microscopic GDR parameters and level densities derived from the same CDFT framework are implemented as structure-based inputs to statistical reaction calculations. This unified treatment establishes a coherent link between intrinsic quasiparticle dynamics, collective dipole response, and reaction observables, providing a microscopic foundation for nuclear reaction modeling in medium and heavy nuclei.