Physics Letters B (Nov 2018)
Change in structure between the I = 1/2 states in 181Tl and 177,179Au
- J.G. Cubiss,
- A.E. Barzakh,
- A.N. Andreyev,
- M. Al Monthery,
- N. Althubiti,
- B. Andel,
- S. Antalic,
- D. Atanasov,
- K. Blaum,
- T.E. Cocolios,
- T. Day Goodacre,
- R.P. de Groote,
- A. de Roubin,
- G.J. Farooq-Smith,
- D.V. Fedorov,
- V.N. Fedosseev,
- R. Ferrer,
- D.A. Fink,
- L.P. Gaffney,
- L. Ghys,
- A. Gredley,
- R.D. Harding,
- F. Herfurth,
- M. Huyse,
- N. Imai,
- D.T. Joss,
- U. Köster,
- S. Kreim,
- V. Liberati,
- D. Lunney,
- K.M. Lynch,
- V. Manea,
- B.A. Marsh,
- Y. Martinez Palenzuela,
- P.L. Molkanov,
- P. Mosat,
- D. Neidherr,
- G.G. O'Neill,
- R.D. Page,
- T.J. Procter,
- E. Rapisarda,
- M. Rosenbusch,
- S. Rothe,
- K. Sandhu,
- L. Schweikhard,
- M.D. Seliverstov,
- S. Sels,
- P. Spagnoletti,
- V.L. Truesdale,
- C. Van Beveren,
- P. Van Duppen,
- M. Veinhard,
- M. Venhart,
- M. Veselský,
- F. Wearing,
- A. Welker,
- F. Wienholtz,
- R.N. Wolf,
- S.G. Zemlyanoy,
- K. Zuber
Affiliations
- J.G. Cubiss
- Department of Physics, University of York, York, YO10 5DD, United Kingdom; CERN, CH-1211 Geneva 23, Switzerland; Corresponding author.
- A.E. Barzakh
- Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, Russia
- A.N. Andreyev
- Department of Physics, University of York, York, YO10 5DD, United Kingdom; Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai-mura, Ibaraki 319-1195, Japan; CERN, CH-1211 Geneva 23, Switzerland
- M. Al Monthery
- Department of Physics, University of York, York, YO10 5DD, United Kingdom
- N. Althubiti
- School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- B. Andel
- Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia
- S. Antalic
- Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia
- D. Atanasov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- K. Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- T.E. Cocolios
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom; CERN, CH-1211 Geneva 23, Switzerland
- T. Day Goodacre
- CERN, CH-1211 Geneva 23, Switzerland; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- R.P. de Groote
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- A. de Roubin
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- G.J. Farooq-Smith
- School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom; KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- D.V. Fedorov
- Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, Russia
- V.N. Fedosseev
- CERN, CH-1211 Geneva 23, Switzerland
- R. Ferrer
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- D.A. Fink
- CERN, CH-1211 Geneva 23, Switzerland; Ruprecht-Karls Universität, D-69117 Heidelberg, Germany
- L.P. Gaffney
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- L. Ghys
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium; Belgian Nuclear Research Centre SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
- A. Gredley
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- R.D. Harding
- Department of Physics, University of York, York, YO10 5DD, United Kingdom; CERN, CH-1211 Geneva 23, Switzerland
- F. Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- M. Huyse
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- N. Imai
- High Energy Accelerator Research Organisation (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan
- D.T. Joss
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- U. Köster
- Institut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex 9, France
- S. Kreim
- CERN, CH-1211 Geneva 23, Switzerland; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- V. Liberati
- School of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
- D. Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, France
- K.M. Lynch
- CERN, CH-1211 Geneva 23, Switzerland; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- V. Manea
- CERN, CH-1211 Geneva 23, Switzerland; CSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, France
- B.A. Marsh
- CERN, CH-1211 Geneva 23, Switzerland
- Y. Martinez Palenzuela
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- P.L. Molkanov
- Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, Russia
- P. Mosat
- Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, Slovakia
- D. Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- G.G. O'Neill
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- R.D. Page
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- T.J. Procter
- CERN, CH-1211 Geneva 23, Switzerland; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom
- E. Rapisarda
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium; CERN, CH-1211 Geneva 23, Switzerland
- M. Rosenbusch
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
- S. Rothe
- CERN, CH-1211 Geneva 23, Switzerland; Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
- K. Sandhu
- School of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
- L. Schweikhard
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
- M.D. Seliverstov
- Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, Russia
- S. Sels
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- P. Spagnoletti
- School of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
- V.L. Truesdale
- Department of Physics, University of York, York, YO10 5DD, United Kingdom
- C. Van Beveren
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- P. Van Duppen
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- M. Veinhard
- CERN, CH-1211 Geneva 23, Switzerland
- M. Venhart
- Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
- M. Veselský
- Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
- F. Wearing
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
- A. Welker
- CERN, CH-1211 Geneva 23, Switzerland; Technische Universität Dresden, 01069 Dresden, Germany
- F. Wienholtz
- CERN, CH-1211 Geneva 23, Switzerland; Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
- R.N. Wolf
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- S.G. Zemlyanoy
- Joint Institute of Nuclear Research, 141980 Dubna, Moscow Region, Russia
- K. Zuber
- Technische Universität Dresden, 01069 Dresden, Germany
- Journal volume & issue
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Vol. 786
pp. 355 – 363
Abstract
The first accurate measurements of the α-decay branching ratio and half-life of the Iπ=1/2+ ground state in 181Tl have been made, along with the first determination of the magnetic moments and I=1/2 spin assignments of the ground states in 177,179Au. The results are discussed within the complementary systematics of the reduced α-decay widths and nuclear g factors of low-lying, Iπ=1/2+ states in the neutron-deficient lead region. The findings shed light on the unexpected hindrance of the 1/2+→1/2+, 181Tl→g177Aug α decay, which is explained by a mixing of π3s1/2 and π2d3/2 configurations in 177Aug, whilst 181Tlg remains a near-pure π3s1/2. This conclusion is inferred from the g factor of 177Aug which has an intermediate value between those of π3s1/2 and π2d3/2 states. A similar mixed configuration is proposed for the Iπ=1/2+ ground state of 179Au. This mixing may provide evidence for triaxial shapes in the ground states in these nuclei. Keywords: Nuclear physics, Decay spectroscopy, Laser spectroscopy, Nuclear deformation, Gold nuclei, Thallium nuclei
