Decay of the 9/2 isomer in Tl181 and mass determination of low-lying states in Tl181, Au177, and Ir173

A. N. Andreyev, S. Antalic, D. Ackermann, T. E. Cocolios, V. F. Comas, J. Elseviers, S. Franchoo, S. Heinz, J. A. Heredia, F. P. Heßberger, S. Hofmann, M. Huyse, J. Khuyagbaatar, I. Kojouharov, B. Kindler, B. Lommel, R. Mann, R. D. Page, S. Rinta-Antila, P. J. Sapple, Š. Šáro, P. Van Duppen, M. Venhart, and H. V. Watkins
Phys. Rev. C 80, 024302 – Published 4 August 2009

Abstract

A detailed spectroscopic study of the neutron-deficient isotope Tl181 and the daughter of its α decay, Au177, has been performed in the complete fusion reaction Ca40+Sm144Pb184* at the velocity filter SHIP (GSI). The mass excess, excitation energy, and decay scheme of the isomeric 1.40(3) ms, 9/2 intruder state in Tl181 have been established for the first time. These results solve a long-standing puzzle of the unrealistically large reduced α-decay width of this isomer. Based on this, the previously unknown masses of the long-lived isomeric states in Au177 and Ir173 have been derived. In turn, it now allows the excitation energies of previously identified bands in Au177 and Ir173 to be deduced and compared with theoretical predictions. First measurements of α-decay branching ratios for Tl181m and Au177m,g are also reported.

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  • Received 1 June 2009

DOI:https://doi.org/10.1103/PhysRevC.80.024302

©2009 American Physical Society

Authors & Affiliations

A. N. Andreyev1,7, S. Antalic2, D. Ackermann3, T. E. Cocolios1, V. F. Comas3, J. Elseviers1, S. Franchoo5, S. Heinz3, J. A. Heredia3, F. P. Heßberger3, S. Hofmann3,6, M. Huyse1, J. Khuyagbaatar3, I. Kojouharov3, B. Kindler3, B. Lommel3, R. Mann3, R. D. Page4, S. Rinta-Antila4, P. J. Sapple4, Š. Šáro2, P. Van Duppen1, M. Venhart1, and H. V. Watkins4

  • 1Instituut voor Kern-en Stralingsfysica, K. U. Leuven, University of Leuven, B-3001 Leuven, Belgium
  • 2Department of Nuclear Physics and Biophysics, Comenius University, Bratislava, SK-84248, Slovakia
  • 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
  • 4Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KIngdom
  • 5IPN Orsay, F-91406 Orsay Cedex, France
  • 6Physikalisches Institut, J. W. Goethe-Universität, D-60054 Frankfurt, Germany
  • 7School of Engineering and Science, University of the West of Scotland, Paisley, PA1 2BE, United KIngdom

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Vol. 80, Iss. 2 — August 2009

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