Coherent contributions to isospin mixing in the mirror pair 67As and 67Se

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. Marginean, 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-Dobon, R. Wadsworth, K.T. Wiedemann, S. Zhu

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Abstract

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 67Se and 67As 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
Number of pages4
JournalPhysical Review Letters
Volume103
Issue number5
DOIs
Publication statusPublished - 28 Jul 2009
Externally publishedYes

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Orlandi, R., de Angelis, G., Bizzeti, P. G., Lunardi, S., Gadea, A., Bizzeti-Sona, A. M., ... Zhu, S. (2009). Coherent contributions to isospin mixing in the mirror pair 67As and 67Se. Physical Review Letters, 103(5), [052501]. https://doi.org/10.1103/PhysRevLett.103.052501