On the decay of the J = 11/2-, T1/2 = 38.9 h isomer in 133Ba: search for the E5 transition and verification of the EC branch
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 long-standing controversy in...
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Published in | Journal of physics. G, Nuclear and particle physics Vol. 38; no. 1 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bristol
Institute of Physics
2011
IOP Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | 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 long-standing 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 (MQPM). 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. |
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ISSN: | 0954-3899 1361-6471 |
DOI: | 10.1088/0954-3899/38/1/015101 |