Speaker
Description
The giant dipole resonance (GDR) is one of the most well-known collective excitation modes since the dawn of research on nuclear physics. The origin of GDR is a collective motion of neutrons against protons inside the nucleus. Since its discovery in the photoabsorption cross section, extensive theoretical studies have been done to reveal the nature of such electric dipole excitation. The (quasiparticle) random-phase approximation [(Q)RPA] based on the nuclear density functional theory is commonly used to address the collective excitation. With the finite amplitude method (FAM), the linear equations of (Q)RPA are iteratively solved and the computational cost of (Q)RPA is significantly reduced. Here, we analytically derive the linear terms of residual interactions and calculate cross section of GDR based on FAM. In our FAM implementation, the residual interaction is explicitly linearized, so that we can avoid iterative procedure as done in usual FAM and speed-up the calculation. The calculated photonuclear reactions cross sections are compared with available experimental data to demonstrate how the fully microscopic density functional theory predicts GDR without any phenomenological parameters.