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

J. Sauvage; J. Genevey; B. Roussière; S. Franchoo; A. N. Andreyev; N. Barré; J. -F. Clavelin; H. De Witte; D. V. Fedorov; V. N. Fedoseyev; L. M. Fraile; X. Grave; G. Huber; M. Huyse; H. B. Jeppesen; U. Köster; P. Kunz; S. R. Lesher; B. A. Marsh; I. Mukha; J. Oms; M. Seliverstov; I. Stefanescu; K. Van de Vel; J. Van de Walle; P. Van Duppen; Yu. M. Volkov

doi:10.1140/epja/i2008-10693-3

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2009) 39: 33-48
https://doi.org/10.1140/epja/i2008-10693-3

Regular Article - Experimental Physics

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

J. Sauvage¹^*, J. Genevey², B. Roussière¹, S. Franchoo¹^,3^,4, A. N. Andreyev⁵^,6^,7, N. Barré¹, J. -F. Clavelin¹, H. De Witte⁵, D. V. Fedorov⁸, V. N. Fedoseyev⁴, L. M. Fraile⁴, X. Grave¹, G. Huber³, M. Huyse⁵, H. B. Jeppesen⁴, U. Köster⁴^,9, P. Kunz³, S. R. Lesher⁵, B. A. Marsh⁴, I. Mukha⁵, J. Oms¹, M. Seliverstov³^,8, I. Stefanescu⁵, K. Van de Vel⁵, J. Van de Walle⁴, P. Van Duppen⁵ and Yu. M. Volkov⁸

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 Institut für Physik, Johannes Gutenberg Universität, D-55099, Mainz, Germany
⁴ ISOLDE, CERN, CH-1211, Genève, Switzerland
⁵ Instituut voor Kern- en Stralingsfysica, K.U. Leuven, B-3001, Leuven, Belgium
⁶ Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
⁷ TRIUMF, V6T 2A3, Vancouver, BC, Canada
⁸ Petersburg Nuclear Physics Institute, 188350, Gatchina, Russia
⁹ Institut Laue-Langevin, 38042, Grenoble cedex 9, France

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

Received: 28 August 2008
Revised: 13 November 2008
Published online: 14 January 2009

Abstract

The /EC decay of ^{189m, g}Pb has been studied at the ISOLDE facility using nuclear spectroscopy and in-source laser spectroscopy. A level scheme of ¹⁸⁹Tl has been built from - 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.

PACS: 21.10.Hw Spin, parity, and isobaric spin – / 23.20.Lv transitions and level energies – / 42.62.Fi Laser spectroscopy – / 21.60.Ev Collective models –

© SIF, Springer-Verlag Berlin Heidelberg, 2009