https://doi.org/10.1140/epja/i2004-10112-y
The βdecay of 147Cs to 147Ba
1
Department of Detectors and Nuclear Electronics, Sołtan Institute for Nuclear Studies, 05-400, Świerk, Poland
2
Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681, Warsaw, Poland
3
Department of Radiation Sciences, Uppsala University, 611 82, Nyköping, Sweden
4
Oliver Lodge Laboratory, University of Liverpool, L69 3BX, Liverpool, UK
5
Department of Nuclear Spectroscopy, Sołtan Institute for Nuclear Studies, 05-400, Świerk, Poland
* e-mail: syntfeld@ipj.gov.pl
Received:
23
August
2004
Accepted:
30
November
2004
Published online:
18
January
2005
The β--decay of 147Cs to 147Ba has been studied by means of γ- and X-ray spectroscopy. A new level scheme of 147Ba is significantly modified and extended in comparison to the one previously reported. The Advanced Time-Delayed βγγ(t) method has been applied to measure half-lives of the 46.2 and 85.4 keV levels in 147Ba yielding T 1/2 of 510(80) ps and 370(100) ps, respectively. The lifetime results combined with the deduced internal conversion coefficients allowed to assign M1 multipolarity to three γ transitions. The B(M1) values obtained for the 39.2, 46.2 and 85.4 keV transitions range from 0.017 to 0.043 W.u. and represent typical B(M1) strength in the Ba-Er region. Model calculations using a shell correction approach with the axially deformed Woods-Saxon potential predict for 147Ba an octupole deformed ground state with β3 = 0.11.
PACS: 27.60.+j 90 ⩽ A ⩽ 149 – / 29.30.Kv X- and γ-ray spectroscopy – / 21.10.Tg Lifetimes – / 21.10.Ky Electromagnetic moments –
© Società Italiana di Fisica and Springer-Verlag, 2005