Change in structure between the I = 1/2 states in 181Tl and 177,179Au
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 complementar...
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| Format: | Article |
| Language: | English |
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Elsevier
2018-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269318307627 |
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English |
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Article |
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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 |
| spellingShingle |
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 Change in structure between the I = 1/2 states in 181Tl and 177,179Au Physics Letters B |
| author_facet |
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 |
| author_sort |
J.G. Cubiss |
| title |
Change in structure between the I = 1/2 states in 181Tl and 177,179Au |
| title_short |
Change in structure between the I = 1/2 states in 181Tl and 177,179Au |
| title_full |
Change in structure between the I = 1/2 states in 181Tl and 177,179Au |
| title_fullStr |
Change in structure between the I = 1/2 states in 181Tl and 177,179Au |
| title_full_unstemmed |
Change in structure between the I = 1/2 states in 181Tl and 177,179Au |
| title_sort |
change in structure between the i = 1/2 states in 181tl and 177,179au |
| publisher |
Elsevier |
| series |
Physics Letters B |
| issn |
0370-2693 |
| publishDate |
2018-11-01 |
| description |
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 |
| url |
http://www.sciencedirect.com/science/article/pii/S0370269318307627 |
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doaj-be8165a94a9e40e983a7ac7bbdc0b2682020-11-25T01:08:40ZengElsevierPhysics Letters B0370-26932018-11-01786355363Change in structure between the I = 1/2 states in 181Tl and 177,179AuJ.G. Cubiss0A.E. Barzakh1A.N. Andreyev2M. Al Monthery3N. Althubiti4B. Andel5S. Antalic6D. Atanasov7K. Blaum8T.E. Cocolios9T. Day Goodacre10R.P. de Groote11A. de Roubin12G.J. Farooq-Smith13D.V. Fedorov14V.N. Fedosseev15R. Ferrer16D.A. Fink17L.P. Gaffney18L. Ghys19A. Gredley20R.D. Harding21F. Herfurth22M. Huyse23N. Imai24D.T. Joss25U. Köster26S. Kreim27V. Liberati28D. Lunney29K.M. Lynch30V. Manea31B.A. Marsh32Y. Martinez Palenzuela33P.L. Molkanov34P. Mosat35D. Neidherr36G.G. O'Neill37R.D. Page38T.J. Procter39E. Rapisarda40M. Rosenbusch41S. Rothe42K. Sandhu43L. Schweikhard44M.D. Seliverstov45S. Sels46P. Spagnoletti47V.L. Truesdale48C. Van Beveren49P. Van Duppen50M. Veinhard51M. Venhart52M. Veselský53F. Wearing54A. Welker55F. Wienholtz56R.N. Wolf57S.G. Zemlyanoy58K. Zuber59Department of Physics, University of York, York, YO10 5DD, United Kingdom; CERN, CH-1211 Geneva 23, Switzerland; Corresponding author.Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, RussiaDepartment 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, SwitzerlandDepartment of Physics, University of York, York, YO10 5DD, United KingdomSchool of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomDepartment of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, SlovakiaDepartment of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, SlovakiaMax-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, GermanyMax-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, GermanyKU 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, SwitzerlandCERN, CH-1211 Geneva 23, Switzerland; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumMax-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, GermanySchool of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United Kingdom; KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumPetersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, RussiaCERN, CH-1211 Geneva 23, SwitzerlandKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumCERN, CH-1211 Geneva 23, Switzerland; Ruprecht-Karls Universität, D-69117 Heidelberg, GermanyKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium; Belgian Nuclear Research Centre SCK•CEN, Boeretang 200, B-2400 Mol, BelgiumOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomDepartment of Physics, University of York, York, YO10 5DD, United Kingdom; CERN, CH-1211 Geneva 23, SwitzerlandGSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, GermanyKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumHigh Energy Accelerator Research Organisation (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, JapanOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomInstitut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex 9, FranceCERN, CH-1211 Geneva 23, Switzerland; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, GermanySchool of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE, United KingdomCSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, FranceCERN, CH-1211 Geneva 23, Switzerland; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomCERN, CH-1211 Geneva 23, Switzerland; CSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, FranceCERN, CH-1211 Geneva 23, SwitzerlandKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumPetersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, RussiaDepartment of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248 Bratislava, SlovakiaGSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, GermanyOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomCERN, CH-1211 Geneva 23, Switzerland; School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, United KingdomKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium; CERN, CH-1211 Geneva 23, SwitzerlandErnst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, GermanyCERN, CH-1211 Geneva 23, Switzerland; Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, GermanySchool of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE, United KingdomErnst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, GermanyPetersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, RussiaKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumSchool of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE, United KingdomDepartment of Physics, University of York, York, YO10 5DD, United KingdomKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumKU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, BelgiumCERN, CH-1211 Geneva 23, SwitzerlandInstitute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, SlovakiaInstitute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, SlovakiaOliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United KingdomCERN, CH-1211 Geneva 23, Switzerland; Technische Universität Dresden, 01069 Dresden, GermanyCERN, CH-1211 Geneva 23, Switzerland; Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, GermanyErnst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany; Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, GermanyJoint Institute of Nuclear Research, 141980 Dubna, Moscow Region, RussiaTechnische Universität Dresden, 01069 Dresden, GermanyThe 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 nucleihttp://www.sciencedirect.com/science/article/pii/S0370269318307627 |