E5 decay from the Jπ=11/2- isomer in Ba 137

K. Moran, E. A. McCutchan, C. J. Lister, S. Zhu, M. P. Carpenter, P. Chowdhury, J. P. Greene, T. Lauritsen, E. Merchan, R. Shearman

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12 Scopus citations


A new γ-decay branch has been found from the well-known 661.659(3)-keV Jπ=11/2-, T1/2=2.552(1) min isomer in Ba137 which is populated in the β decay of Cs137. The new 377.9(3)-keV γ ray connects the isomer to the low-lying 283.5 keV, Jπ=1/2- state. It is of near-pure E5 character. The decay has a γ branching ratio (Brγ=Γγ/Γtot) of 1.12(9)×10-7. The new decay has a B(E5) of 0.71(6) W.u. [B(E5)↓=6.5(6)×105e2fm10], a value consistent with other "single-particle" E5 decays in the region. The new decay branch is of topical interest, as it competes with the much-sought "two-photon" second-order electromagnetic decay from this state.

Original languageEnglish (US)
Article number041303
JournalPhysical Review C - Nuclear Physics
Issue number4
StatePublished - Oct 28 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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