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An unstable isotope Lu-176 decays to Hf-176 with a half-life of approximately 4×10^10 y. The Lu-176 could be used as a nuclear cosmochorometer for dating the nucleosynthesis event before the solar system formation. However, the half-lives measured with various nuclear experiments are inconsistent with each other. Furthermore, the half-lives evaluated from the Lu and Hf isotopic abundances in meteorites and terrestrial rocks are also inconsistent. Thus, a new measurement by nuclear experiment being insensitive to gamma-ray branching ratios and the capitulation of detection efficiency. Here, we have measured a half-life using a new method being not sensitive to the various parameters. We have measured the half-life using a windowless 4pi-type BGO scintillation detector with a total detection efficiency of approximately 99.9%. The presently obtained half-life is consistent with that obtained from the meteorites and terrestrial rocks within the uncertainty. The present value is the most precise among the previously measured half-lives. This result provides a nuclear cosmochronometer for studying geological events and stellar nucleosynthesis.
Please select a main topic related to your abstract | Meteorite Analysis and Isotopic Abundance |
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