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Nuclear structure of 189Tl states studied via \( \beta^{{+}}_{}\) /EC decay and laser spectroscopy of 189m+gPb

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Abstract

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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Sauvage, J., Genevey, J., Roussière, B. et al. Nuclear structure of 189Tl states studied via \( \beta^{{+}}_{}\) /EC decay and laser spectroscopy of 189m+gPb. Eur. Phys. J. A 39, 33–48 (2009). https://doi.org/10.1140/epja/i2008-10693-3

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