Constraints on the176Lu cosmochronometer |
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Authors: | J R De Laeter B J Allen G C Lowenthal J W Boldeman |
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Institution: | (1) Department of Applied Physics, Curtin University of Technology, 6001 Perth, Western Australia, Australia;(2) Australian Atomic Energy Commission Research Establishment, 2232 Lucas Heights, New South Wales, Australia |
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Abstract: | In an endeavour to resolve reported discrepancies in the value of the branching ratio of176Lu at astrophysical energies, a new determineation of the175Lu (nγ)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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Keywords: | s-process nucleosynthesis 176Lu cosmochronometer branching ratio nuclear reactions |
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