Abstract
Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with beams from REX-ISOLDE. Magnitudes and relative signs of the reduced matrix elements that couple the ground state and low-lying excited states in were extracted. Information on the deformation of the ground and the first excited states was deduced using the quadrupole sum rules approach. Results show that the ground state is slightly deformed and of oblate nature, while a larger deformation for the excited state was noted in . The results are compared to beyond mean field and interacting-boson based models and interpreted within a two-state mixing model. Partial agreement with the model calculations was obtained. The presence of two different structures in the light even-mass mercury isotopes that coexist at low excitation energy is firmly established.
- Received 8 November 2013
DOI:https://doi.org/10.1103/PhysRevLett.112.162701
© 2014 American Physical Society