Abstract
We have studied via in-beam γ-ray spectroscopy and , which are the first neutron-deficient Po isotopes to exhibit a collective low-lying structure. The ratios of yrast state energies and the E2 branching ratios of transitions from non-yrast to yrast states are indicative of a low-lying vibrational structure. The onset of collective motion in these isotopes can be attributed to the opening of the neutron orbital at N≊112 and the resulting large overlap between the two valence protons in the orbital and the valence neutrons in the orbital.
- Received 28 February 1995
DOI:https://doi.org/10.1103/PhysRevC.52.621
©1995 American Physical Society