Systematic study of isoscalar giant resonances in Sm 148,150,152,154 using the extended interacting boson model

Document Type

Article

Publication Date

4-1-2025

Abstract

An extended interacting boson model incorporating one-particle-one-hole (1p-1h) excitations to the next nearest shell and configuration mixing due to two-particle-two-hole (2p-2h) excitations from the nearest lower shell is applied to systematically describe the low-lying spectra and isoscalar giant monopole and quadrupole resonances (ISGMR and ISGQR) of the well-deformed nuclei Sm148,150,152,154. The model results are compared with experimental data and with those of the consistent-Q formalism that includes 1p-1h excitations but lacks 2p-2h configuration mixing. The extended model shows improved agreement with both low-lying spectral properties and high-lying excitations associated with ISGMR and ISGQR compared to the original consistent-Q formalism. Furthermore, the X(5) critical point features are not only evident in the low-lying level energies and corresponding B(E2) ratios, but also reflected in the effective charge parameters and excitation energies associated with 1p-1h excitations.

Publication Source (Journal or Book title)

Physical Review C

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