E5 decay from the Jπ=11/2- isomer in Ba137

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

doi:10.1103/PhysRevC.90.041303

Title: $E 5$ decay from the $J^{π} = 11 / 2^{-}$ isomer in ${}^{137}{Ba}$

Journal Article · Wed Oct 01 00:00:00 EDT 2014 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.90.041303· OSTI ID:1392508

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

A new gamma-decay branch has been found from the well-known 661.659(3)-keV J(pi) = 11/2(-), T-1/2 = 2.552(1) min isomer in Ba-137 which is populated in the beta decay of Cs-137. The new 377.9(3)-keV gamma ray connects the isomer to the low-lying 283.5 keV, J(pi) = 1/2(-) state. It is of near-pure E5 character. The decay has a gamma branching ratio (Br-gamma = Gamma(gamma)/Gamma(tot)) of 1.12(9) x 10(-7). The new decay has a B(E5) of 0.71(6) W.u. [ B(E5) down arrow= 6.5(6) x 10(5) e(2) fm(10)], 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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Nuclear Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1392508

Journal Information:: Physical Review. C, Nuclear Physics, Vol. 90, Issue 4; ISSN 0556-2813

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

References (12)

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Title: $E 5$ decay from the $J^{π} = 11 / 2^{-}$ isomer in ${}^{137}{Ba}$