Coherent Contributions to Isospin Mixing in the Mirror Pair As67 and Se67

R. Orlandi, G. De Angelis, P. G. Bizzeti, S. Lunardi, A. Gadea, A. M. Bizzeti-Sona, A. Bracco, F. Brandolini, M. P. Carpenter, C. J. Chiara, F. Della Vedova, E. Farnea, J. P. Greene, S. M. Lenzi, S. Leoni, C. J. Lister, N. Mǎrginean, D. Mengoni, D. R. Napoli, B. S.Nara SinghO. L. Pechenaya, F. Recchia, W. Reviol, E. Sahin, D. G. Sarantites, D. Seweryniak, D. Tonev, C. A. Ur, J. J. Valiente-Dobón, R. Wadsworth, K. T. Wiedemann, S. Zhu

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Isospin symmetry breaking has been investigated in mass A=67 mirror nuclei through the experimental determination of the E1 strengths of analog electromagnetic transitions. Lifetimes of excited states have been measured in Se67 and As67 with the centroid shift method. Through the comparison of the B(E1) strengths of the mirror 9/2+→7/2- 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.

Original languageEnglish
Article number052501
JournalPhysical Review Letters
Issue number5
StatePublished - Aug 6 2009


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