Abstract
Excited states in have been studied via the Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the -ray yields observed with Gammasphere. The and strength distributions between the lowest six states up to 2.7 MeV enables us to identify the state in as the dominant fragment of the one-phonon mixed-symmetry state. Mixing between this level and a nearby isoscalar state is observed and is more than 4 times larger than in the neighboring isotone . This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.
- Received 27 November 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.122501
©2006 American Physical Society