Low-Energy Dipole Strength Distribution in : Coexistence of Scissors and Octupole Resonances
Phys. Rev. Lett. 136, 252501 – Published 23 June, 2026
DOI: https://doi.org/10.1103/rcb1-gntj
Abstract
The dipole response of has been investigated for the first time using nuclear resonance fluorescence, providing comprehensive and detailed information about the nucleus. The strength, concentrated in the 3–4 MeV region, is consistent with a scissors resonance. As a surprising new feature, a pronounced resonancelike structure at 4.5–5.5 MeV has been found. It is interpreted as an octupole resonance and provides evidence for low-spin octupole correlations in this excitation energy regime. The experimental results are compared with quasiparticle random phase approximation calculations, which reproduce the gross features of the cumulative strength. These observations support the coexistence of scissors and octupole-induced resonances as a general feature of deformed nuclei with octupole softness.