Change in structure between the I=1/2 states in 181 Tl 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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Main Authors: Cubiss, James (Author) , Barzakh, A. E. (Author) , Andreyev, A. N. (Author) , Al Monthery, M. (Author) , Althubiti, N. (Author) , Andel, B. (Author) , Antalic, S. (Author) , Atanasov, Dinko (Author) , Blaum, Klaus (Author) , Cocolios, T. E. (Author) , Day Goodacre, T. (Author) , de Groote, R. P. (Author) , de Roubin, A. (Author) , Farooq-Smith, G. J. (Author) , Fedorov, D. V. (Author) , Fedosseev, V. N. (Author) , Ferrer, R. (Author) , Fink, Daniel (Author) , Gaffney, L. P. (Author) , Ghys, L. (Author) , Gredley, A. (Author) , Harding, R. D. (Author) , Herfurth, F. (Author) , Huyse, M. (Author) , Imai, N. (Author) , Joss, D. T. (Author) , Köster, U. (Author) , Kreim, Susanne (Author) , Wolf, Robert (Author) , Zemlyanoy, S. G. (Author) , Zuber, K. (Author)
Format: Article (Journal)
Language:English
Published: 5 October 2018
In: Physics letters
Year: 2018, Volume: 786, Pages: 355-363
ISSN:1873-2445
DOI:10.1016/j.physletb.2018.10.005
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2018.10.005
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269318307627
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Author Notes: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

MARC

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246 3 3 |a Change in structure between the I = 1/2 states in 181 Tl and 177, 179 Au 
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520 |a 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. 
650 4 |a Decay spectroscopy 
650 4 |a Gold nuclei 
650 4 |a Laser spectroscopy 
650 4 |a Nuclear deformation 
650 4 |a Nuclear physics 
650 4 |a Thallium nuclei 
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