Decay of the 9/2{sup -} isomer in {sup 181}Tl and mass determination of low-lying states in {sup 181}Tl, {sup 177}Au, and {sup 173}Ir
- Instituut voor Kern-en Stralingsfysica, K. U. Leuven, University of Leuven, B-3001 Leuven (Belgium)
- Department of Nuclear Physics and Biophysics, Comenius University, Bratislava, SK-84248 (Slovakia)
- GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, D-64291 Darmstadt (Germany)
- IPN Orsay, F-91406 Orsay Cedex (France)
A detailed spectroscopic study of the neutron-deficient isotope {sup 181}Tl and the daughter of its {alpha} decay, {sup 177}Au, has been performed in the complete fusion reaction {sup 40}Ca+{sup 144}Sm{yields}{sup 184}Pb* at the velocity filter SHIP (GSI). The mass excess, excitation energy, and decay scheme of the isomeric 1.40(3) ms, 9/2{sup -} intruder state in {sup 181}Tl have been established for the first time. These results solve a long-standing puzzle of the unrealistically large reduced {alpha}-decay width of this isomer. Based on this, the previously unknown masses of the long-lived isomeric states in {sup 177}Au and {sup 173}Ir have been derived. In turn, it now allows the excitation energies of previously identified bands in {sup 177}Au and {sup 173}Ir to be deduced and compared with theoretical predictions. First measurements of {alpha}-decay branching ratios for {sup 181}Tl{sup m} and {sup 177}Au{sup m,g} are also reported.
- OSTI ID:
- 21293779
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 2; Other Information: DOI: 10.1103/PhysRevC.80.024302; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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