Efficient calculation for the quasiparticle random-phase approximation matrix

Abstract

We present an efficient numerical technique to evaluate the matrix of the (quasiparticle)-random-phase approximation, using the finite amplitude method (FAM). The method is tested in calculation of monopole excitations in 120Sn, compared with result obtained with the former iterative FAM. The neutron-pair-transfer modes are calculated with the present method and their character change in neutron-rich Pb isotopes is discussed. Computational aspects of different FAM approaches are also discussed for future applications to a large-scale computation.

18 pages, 2 figures

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• Non-iterative finite amplitude methods for E1 and M1 giant resonances
• Finite-amplitude method: An extension to the covariant density functionals
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• Multipole Modes for Triaxially Deformed Superfluid Nuclei
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