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Nuclear structure of 189Tl states studied via beta^{{+}}_{} /EC decay and laser spectroscopy of 189m+gPb |
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| Authors: | 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. K?ster 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 |
| Affiliation: | 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 Universit?t, 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 |
| Abstract: | The  /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  - 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. |
| Keywords: | KeywordHeading" >PACS 21.10.Hw Spin, parity, and isobaric spin 23.20.Lv IEq5" > |
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