Comparative analysis of formalisms and performances of three different beyond-mean-field approaches

0569143 - ÚJF 2024 RIV US eng J - Článek v odborném periodiku
Knapp, F. - Papakonstantinou, P. - Veselý, Petr - De Gregorio, G. - Herko, J. - Lo Iudice, N.
Comparative analysis of formalisms and performances of three different beyond-mean-field approaches.
Physical Review C. Roč. 107, č. 1 (2023), č. článku 014305. ISSN 2469-9985. E-ISSN 2469-9993
Grant CEP: GA ČR GA19-14048S
Institucionální podpora: RVO:61389005
Klíčová slova: equation of motion phonon method (EMPM) * second Tamm-Dancoff approximations (STDA) * second random-phase approximations (SRPA)
Obor OECD: Nuclear physics
Impakt faktor: 3.1, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevC.107.014305

We investigate the differences and analogies between the equation of motion phonon method (EMPM) and second Tamm-Dancoff and random-phase approximations (STDA and SRPA) paying special attention to the problem of spurious center-of-mass (c.m.) admixtures. In order to compare them on an equal footing, we perform self-consistent calculations of the multipole strength distributions in selected doubly magic nuclei within a space including up to two-particle-two-hole (2p-2h) basis states using the unitary correlation operator method two-body intrinsic Hamiltonian and we explore the tools each approach supplies for removing the spurious c.m. admixtures. We find that the EMPM and STDA yield exactly the same results when the same intrinsic Hamiltonian is used and the coupling of the Hartree-Fock state with the 2p-2h space is neglected, but, unlike STDA and SRPA, the EMPM offers the possibility to completely remove c.m. admixtures.
Trvalý link: https://hdl.handle.net/11104/0340461