Abstract
Isospin symmetry breaking has been investigated in mass mirror nuclei through the experimental determination of the strengths of analog electromagnetic transitions. Lifetimes of excited states have been measured in and with the centroid shift method. Through the comparison of the strengths of the mirror transitions, the isovector and the isoscalar components of the electromagnetic transition amplitude were extracted. The presence of a large isoscalar component provides evidence for coherent contributions to isospin mixing, probably involving the isovector giant monopole resonance.
- Received 2 March 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.052501
©2009 American Physical Society