Abstract
The transition rates for the states in were studied using the recoil distance Doppler-shift technique applied to projectile Coulomb excitation reactions. The deduced strengths illustrate the enhanced collectivity of the neutron-rich Fe isotopes up to . The results are interpreted using the generalized concept of valence proton symmetry which describes the evolution of nuclear structure around as governed by the number of valence protons with respect to . The trend of collectivity suggested by the experimental data is described by state-of-the-art shell-model calculations with a new effective interaction developed for the valence space.
- Received 28 June 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.022502
© 2011 American Physical Society