Phonon damping model using random-phase-approximation operators - art. no.024302

A fully microscopic interpretation of the phonon damping model (PDM) is pro posed. The phonon operator, which generates the collective excitation such as giant dipole resonance (GDR), is constructed from coherent particle-hole pairs. The phonon energy is determined as the solution of dispersion equat ion within the random-phase approximation (RPA). The phonon structure is fo und in term of RPA X and Y amplitudes. The formalism is illustrated by nume rical calculations within a schematic model. The results of calculations de monstrate the same feature of GDR as a function of temperature obtained pre viously within PDM-1, which employs structureless phonons.