• B. J. Allen

      Articles written in Journal of Astrophysics and Astronomy

    • Constraints on the176Lu cosmochronometer

      J. R. De Laeter B. J. Allen G. C. Lowenthal J. W. Boldeman

      More Details Abstract Fulltext PDF

      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.

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