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

Abstract : The β+/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 T1/2 = 50±3 s and T1/2 = 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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http://hal.in2p3.fr/in2p3-00366165
Contributor : Emmanuelle Vernay <>
Submitted on : Friday, March 6, 2009 - 8:57:12 AM
Last modification on : Thursday, November 19, 2020 - 12:58:50 PM

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J. Sauvage, J. Genevey, B. Roussière, S. Franchoo, A.N. Andreyev, et al.. Nuclear structure of 189Tl states studied via ?+/EC decay and laser spectroscopy of 189m+gPb. European Physical Journal A, EDP Sciences, 2009, 39, pp.33-48. ⟨10.1140/epja/i2008-10693-3⟩. ⟨in2p3-00366165⟩

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