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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/009/01/0007-0015

    • Keywords

       

      s-process nucleosynthesis; 176Lu cosmochronometer; branching ratio; nuclear reactions

    • Abstract

       

      In an endeavour to resolve reported discrepancies in the value of the branching ratio of176Lu at astrophysical energies, a new determineation of the175Lu ()176mLu capture cross section has been measured as 958 ± 58 mb. This gives a value of the branching ratio of 0.21 ±0.05. This result indicates that some reequilibration of the ground and isomeric states of176Lu occurs in stellar environments undergoing s-process nucleosynthesis, and confirms that176Lu is not a reliable cosmochronometer. However the very existence of176Lu in the solar system implies that the ground state of176Lu was not completely depopulated, and provides the possibility of using this nuclide as a sensitive thermometer for stellar processes.

    • Author Affiliations

       

      J. R. De Laeter1 B. J. Allen2 G. C. Lowenthal2 J. W. Boldeman2

      1. Department of Applied Physics, Curtin University of Technology, Perth, Western Australia - 6001, Australia
      2. Australian Atomic Energy Commission Research Establishment, Lucas Heights, New South Wales - 2232, Australia
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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