Abstract
The neutron-rich nuclei, and were produced using a laser-ionization isotope-separation on-line method. The resulting -delayed decay was studied. The half-life of is measured to be 0.18(1) s. Two -decaying states are identified in with half-lives of 0.23(3) and 1.6(3) s. In addition, two -decaying states are observed in with half-lives of 0.12(3) and 0.50(18) s. From the decay of these states in many new excited levels are established in and These results are compared to the valence mirror nuclei in the region as well as with shell-model calculations. It can be concluded that collective excitations appear to play an increasingly important role with increasing occupation of the orbital.
- Received 29 November 1999
DOI:https://doi.org/10.1103/PhysRevC.61.054308
©2000 American Physical Society