On the decay of the J π = 11/2 − , T 1/2 = 38.9 h isomer in 133 Ba: search for the E5 transition and verification of the EC branch

TitelOn the decay of the J π = 11/2 − , T 1/2 = 38.9 h isomer in 133 Ba: search for the E5 transition and verification of the EC branch
Publication TypeJournal Article
Year of Publication2011
AuthorsGranholm, P., Lönnroth T., Suhonen J., Bergman J., Källman K. - M., Lill J. - O., Norrby M., Ydrefors E., and Tikkanen P.
JournalJournal of Physics G: Nuclear and Particle Physics
Volume38
Pagination015101
Abstract

This paper presents a search for the competing 11/2 − → 1/2 + E5 branch to the main 11/2 − → 3/2 + M4 transition from the T 1/2 = 39 h, J π = 11/2 − isomeric state in 133 Ba. An upper limit of 1.8 × 10 −5 could be established for the E5/M4 intensity ratio. In addition, a longstanding controversy in the EC decay of the same isomer was resolved: only one EC branch to the 11/2 + state in 133 Cs was observed. The shell-model structures of the involved states in 133 Ba and 133 Cs were studied with the microscopic quasiparticle-phonon model. Good agreement with the decay rates B(λ) was obtained. In particular, the B(M4) value is well reproduced and further only one low-lying 11/2 state could be identified in the latter nuclide, supporting the experimental results.

URLhttp://stacks.iop.org/0954-3899/38/i=1/a=015101

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