Finite amplitude method for the quasiparticle random-phase approximation

Abstract

We present the finite amplitude method (FAM), originally proposed in Ref. [17], for superfluid systems. A Hartree-Fock-Bogoliubov code may be transformed into a code of the quasiparticle-random-phase approximation (QRPA) with simple modifications. This technique has advantages over the conventional QRPA calculations, such as coding feasibility and computational cost. We perform the fully self-consistent linear-response calculation for the spherical neutron-rich nucleus ${}^{174}$Sn, modifying the hfbrad code, to demonstrate the accuracy, feasibility, and usefulness of the FAM.