Speaker
Description
Using the configuration interaction shell model (CISM), we systematically computed the electric dipole (E1) response of all long-lived sd-shell nuclei [1]. Our results were compared with predictions from the quasiparticle random-phase approximation (QRPA) and available experimental photoabsorption data. Additionally, we investigated the nature of the pygmy dipole resonance (PDR) along the Neon and Oxygen isotopic chains, examining its structural properties and evolution with neutron number. Recently, we also explored the isoscalar E1 response of PDR and GDR states. In this talk, I will report those results and try to reply the question of the isovector/isoscalar nature of PDR from the CI-SM perspective.
[1] O. Le Noan and K. Sieja, “Electric dipole response of sd-shell nuclei within the Configuration-Interaction Shell Model approach,” arXiv:2501.17646 [nucl-th], Jan. 2025. To appear in PRC.
