Nuclear structure of 189Tl states studied via ?+/EC decay and laser spectroscopy of 189m+gPb

Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
European Physical Journal A (Impact Factor: 2.74). 01/2009; 39(1). DOI: 10.1140/epja/i2008-10693-3


The \( \beta^{{+}}_{}\) /EC decay of 189m, gPb has been studied at the ISOLDE facility using nuclear spectroscopy and in-source laser spectroscopy. A level scheme of 189Tl has been built from \( \gamma\) -\( \gamma\) coincidence relationships and information on the feeding of some excited levels of 189Tl provided by the hyperfine spectra obtained from laser ionization. The half-lives of both the 13/2+ and 3/2-189Pb isomers have been estimated to be T
1/2 = 50±3 s and T
1/2 = 39±8 s, respectively. Calculations have been performed for different oblate and prolate nuclear deformations using an axial-rotor coupled to one-quasiparticle model, a structure has been suggested for the low-lying levels of the 189Tl nucleus.

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