Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn

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. Lesher; B. A. Marsh; I. Mukha; J. Oms; M. G. Porquet; M. Seliverstov; I. Stefanescu; K. Van de Vel; P. Van Duppen; YU. M. Volkov; A. Wojtasiewicz

doi:10.1140/epja/i2013-13109-5

2022 Impact factor 2.7

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2013) 49: 109
https://doi.org/10.1140/epja/i2013-13109-5

Regular Article - Experimental Physics

Decay of ¹⁸⁵Tl, ^185m+gHg, ^189m+gPb and energy location of the 13/2⁺ isomeric states in ¹⁸⁵Hg, ¹⁸⁹Pb, ¹⁹³Po and ¹⁹⁷Rn

J. Sauvage¹^*, B. Roussière¹, J. Genevey², S. Franchoo¹, A. N. Andreyev³, N. Barré¹, A. Ben Braham⁴, C. Bourgeois¹, J. -F. Clavelin¹, H. De Witte⁵, D. V. Fedorov⁶, V. N. Fedoseyev⁷, L. M. Fraile⁸, X. Grave¹, G. Huber⁹, M. Huyse⁵, P. Kilcher¹, U. Köster¹⁰, P. Kunz¹¹, S. R. Lesher¹², B. A. Marsh⁷, I. Mukha⁵, J. Oms¹, M. G. Porquet¹³, M. Seliverstov⁶^,9, I. Stefanescu¹⁴, K. Van de Vel⁵, P. Van Duppen⁵, YU. M. Volkov⁶ and A. Wojtasiewicz¹⁵

¹ Institut de Physique Nucléaire, IN2P3-CNRS/Université Paris-Sud, F-91406, Orsay Cedex, France
² Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS/Université Joseph Fourier, F-38026, Grenoble Cedex, France
³ Department of Physics, University of York, YO10 5DD, York, UK
⁴ Faculté des sciences de Tunis, 1060, Tunis, Tunisia
⁵ Instituut voor Kern- en Stralingsfysica, B-3001, Leuven, Belgium
⁶ Petersburg Nuclear Physics Institute, 188350, Gatchina, Russia
⁷ ISOLDE, CERN, CH-1211, Genève, Switzerland
⁸ Grupo de Fısica Nuclear, Universidad Complutense, 28040, Madrid, Spain
⁹ Institut für Physik, Johannes Gutenberg Universität, D-55099, Mainz, Germany
¹⁰ Institut Laue-Langevin, F-38042, Grenoble Cedex 9, France
¹¹ TRIUMF, V6T 2A3, Vancouver, Canada
¹² University of Wisconsin-La Crosse, WI 54601, La Crosse, USA
¹³ Centre de Sciences Nucléaires et de Sciences de la Matière, F-91405, Orsay, France
¹⁴ Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Technische Universität München, D-85748, Garching, Germany
¹⁵ Institute of Experimental Physics, University of Warsaw, Warsaw, Poland

^* e-mail: sauvage@ipno.in2p3.fr

Received: 17 December 2012
Accepted: 11 July 2013
Published online: 6 September 2013

Abstract

The /EC decay of ¹⁸⁵Tl was studied at the ISOLDE facility, the -rays belonging to ¹⁸⁵Hg have been identified and a partial low-spin level scheme of ¹⁸⁵Hg has been built. The decay of ^185m+gHg 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 ¹⁸⁵Au and two transitions in ¹⁸⁵Hg . From the analysis performed using an internal energy calibration procedure the energy location of the ^185mHg has been determined to be keV. This value is consistent with that determined independently, keV, using ^185m+gHg -decay data from literature. New particles emitted from ^189m+gPb have been detected and their origins determined by in-source laser spectroscopy at the ISOLDE facility. - coincidence results have served to locate the isomeric state of ¹⁸⁹Pb at keV. This latter value added to -decay data from literature have allowed the energy location of the isomeric states of ¹⁹³Po and ¹⁹⁷Rn at 95(7)keV and 194(12)keV, respectively. The nuclear structure of the isomeric and ground states in the nuclei of the three -emitter chains starting with ^{195m+g, 197m+g, 199m+g}Rn are discussed.