2025

Kauppinen, Elina; Suhonen, Jouni

The isoscalar and isovector monopole (L = 0), dipole (L = 1), quadrupole (L = 2), and octupole (L = 3) strength functions and the associated giant resonances have been calculated in the recently measured 90,92,94Zr and 92,94,96,98,100Mo nuclei by using the spherical quasiparticle random-phase approximation (QRPA). In these calculations, Bonn-A G-matrix-based effective interactions and large no-core Woods-Saxon-based single-particle valence spaces have been used. We compare the obtained results with those of Bonasera et al. [G. Bonasera, S. Shlomo, D. Youngblood, Y.-W. Lui, Krishichayan, and J. Button, Nucl. Phys. A 992, 121612 (2019)] obtained by employing a spherical Hartree-Fock-based random-phase approximation (RPA) with Skyrme-type effective nucleon nucleon interactions (Skyrme-RPA). Such comparison is of great interest since the QRPA is closely related to its proton-neutron counterpart, used to compute double-beta-decay rates of nuclei relevant to present and future double beta-decay experiments. The comparison shows that the QRPA and Skyrme-RPA results for the locations of the isovector giant resonances are completely consistent with each other. For the isoscalar resonances, the QRPA results are fairly consistent with both the Skyrme-RPA and available data, except for the locations of the isoscalar giant dipole resonance, which for the QRPA are clearly lower than those for the Skyrme-RPA, and some 4–7 MeV lower than the experimental locations.