Abstract
Systematic nuclear resonance fluorescence experiments, including model independent parity determinations, provided evidence for enhanced E1 excitations near 2.5 MeV excitation energy in the deformed nuclei , , and . The corresponding = states are interpreted as two-phonon excitations due to the coupling of octupole (J=,K=1) and quadrupole γ vibrations (J=,K=2). The results can be explained in the framework of the sdf interacting-boson-approximation model and the dynamic collective model describing octupole vibrations and their coupling to quadrupole vibrations in deformed nuclei.
- Received 19 July 1993
DOI:https://doi.org/10.1103/PhysRevLett.71.2180
©1993 American Physical Society