Isoscalar giant resonances in the even- Pd isotopes
Phys. Rev. C 114, 044306 – Published 5 October, 2026
DOI: https://doi.org/10.1103/r21q-4789
Abstract
Studies of the isoscalar giant monopole resonance (ISGMR) across the chart of nuclides provide insight into the incompressibility of nuclear matter near saturation density, . Such studies had revealed a discrepancy between theoretical approaches: quasiparticle random-phase approximation (QRPA) derived from Skyrme interactions reproduce the strength distributions of the ISGMR in the “doubly-closed-shell” nuclei and , but their descriptions of strength distributions in open-shell medium-heavy nuclei suggest higher centroid energies should be experimentally observed. The latter nuclei required a smaller and were thus deemed “softer.” The present work serves to add to this “softness” discourse by extracting ISGMR strength distributions for via 386-MeV inelastic scattering. The extracted giant resonance strength distributions are consistent with expectations in this isotopic range. Additional quasiparticle vibration coupling (QPVC) effects are included with the QRPA approach and compared to aforementioned ISGMR strength distributions.
