Self-consistent description of nuclear photoabsorption cross sections

TL;DR

This paper develops and applies advanced computational methods like QRPA, FAM, and the canonical-basis approach within density-functional theory to accurately describe nuclear photoabsorption cross sections, especially for deformed nuclei.

Contribution

It introduces a parallelized QRPA program, demonstrates the finite amplitude method for (Q)RPA calculations, and explores the canonical-basis approach for time-dependent Hartree-Fock-Bogoliubov theory.

Findings

QRPA and FAM effectively compute photoabsorption cross sections for deformed nuclei.

The canonical-basis approach is feasible and useful for time-dependent Hartree-Fock-Bogoliubov calculations.

Parallelized QRPA enhances computational efficiency for nuclear response studies.

Abstract

Several approaches to photonuclear reactions, based on the time-dependent density-functional theory, have been developed recently. The standard linearization leads to the random-phase approximation (RPA) or the quasiparticle-random-phase approximation (QRPA). We have developed a parallelized QRPA computer program for axially deformed nuclei. We also present a feasible approach to the (Q)RPA calculation, that is the finite amplitude method (FAM). We show results of photoabsorption cross sections for deformed nuclei using the QRPA and FAM calculations. Finally, the canonical-basis approach to the time-dependent Hartree-Fock-Bogoliubov method is presented, to demonstrate its feasibility and usefulness.