Decay of Tl, Hg, Pb and energy location of the 13/2 isomeric states in Hg, Pb, Po and Rn

J. Sauvage, B. Roussière, J. Genevey, S. Franchoo, A.N. Andreyev, N. Barré, A. Ben Braham, C. Bourgeois, J.-F. Clavelin, H. de Witte, D.V. Fedorov, V.N. Fedoseyev, L.M. Fraile, X. Grave, G. Huber, M. Huyse, P. Kilcher, U. Köster, P. Kunz, S.R. LesherB.A. Marsh, I. Mukha, J. Oms, M.G. Porquet, M. Seliverstov, I. Stefanescu, K. van de Vel, P. van Duppen, Y.M. Volkov, A. Wojtasiewicz

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The β/EC decay of Tl was studied at the ISOLDE facility, the γ-rays belonging to Hg have been identified and a partial low-spin level scheme of Hg has been built. The decay of Hg was studied at the ISOCELE facility. Conversion electron lines of very low-energy transitions were observed for the first time. Electron data have been obtained for four transitions in Au and two transitions in Hg. From the analysis performed using an internal energy calibration procedure the energy location of the Hg has been determined to be E = 103.7(4) keV. This E value is consistent with that determined independently, E = 94(13) keV, using Hg α-decay data from literature. New α particles emitted from Pb have been detected and their origins determined by in-source laser spectroscopy at the ISOLDE facility. α-γ coincidence results have served to locate the 13/2 isomeric state of Pb at E = 40(4) keV. This latter E value added to α-decay data from literature have allowed the energy location of the 13/2 isomeric states of Po and Rn at 95(7) keV and 194(12) keV, respectively. The nuclear structure of the isomeric and ground states in the nuclei of the three α-emitter chains starting with Rn are discussed.
Original languageEnglish
Pages (from-to)1-17
JournalEuropean Physical Journal A : Hadrons and Nuclei
Issue number9
Publication statusPublished - 1 Jan 2013

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