Change in structure between the I=1/2 states in 181Tl and 177,179Au

Cubiss James G., A. E. Barzakh, Maxim Seliverstov, Andrei N. Andreyev, B. Andel, Stanislav Antalic, Philippe Ascher, Dimitar Atanasov, D. Beck, Jacek Bieron, Klaus Blaum, Christopher Borgmann, Martin Breitenfeldt, L. Capponi, Thomas Elias Cocolios, Thomas Day Goodacre, Xavier Derkx, Hilde De Witte, Jytte Elseviers, D.V. FedorovValentin N. Fedosseev, Stephan Fritzsche, Liam Paul Gaffney, Lars Ghys, Fritz Peter Hessberger, Mark Huyse, Nobuaki Imai, Z. Kalaninova, D. Kisler, Ulli Koester, Magdalena Kowalska, S. Kreim, Joseph F.W. Lane, Valentina Liberati, David Lunney, Kara M Lynch, Vladimir Manea, Bruce A Marsh, S. Mitsuoka, P.L. Molkanov, Y. Nagame, Dennis Neidherr, K. Nishio, S. Ota, Dieter Pauwels, Lucia Popescu, Deyan Radulov, Elisa Rapisarda, J. P. Revill, M. Rosenbusch, Ralf Erik Rossel, Sebastian Rothe, Karanjeet Sandhu, Lutz Schweikhard, Simon Sels, V.L. Truesdale, Celine Van Beveren, Paul Van den Bergh, Y. Wakabayashi, Piet Van Duppen, K.D.A. Wendt, Frank Wienholtz, B. W. Whitmore, G.L. Wilson, R.N. Wolf, Kai Zuber

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    The first accurate measurements of the alpha-decay branching ratio and half-life of the Ipi = 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 alpha-decay widths and nuclear g factors of low-lying, Ipi = 1/2+ states in the neutron-deficient lead region. The finding shed light on the unexpected hindrance of the 1/2+->1/2+, 181Tl(g) -> 177Au(g) alpha decay, which is explained by a mixing of pi3s1/2 and pi2d3/2 configurations in 177Au(g), whilst 181Tl(g) remains a near-pure pi3s1/2. This conclusion is inferred from the g factor of 177Au(g) which has an intermediate value between those of pi3s1/2 and pi2d3/2 states. A similar mixed configuration is proposed for the Ipi=1/2+ ground state of 179Au. This mixing may provide evidence for triaxial shapes in the ground states in the these nuclei.
    Original languageEnglish
    Pages (from-to)355-363
    JournalPhysical Review C
    StatePublished - 5 Oct 2018

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