24-28 October 2022
La Thanh Hotel, Hanoi, Vietnam
Asia/Ho_Chi_Minh timezone
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Accurate half-life determination of a nuclear cosmochronometer 176Lu

28 Oct 2022, 13:30
30m
La Thanh Hotel, Hanoi, Vietnam

La Thanh Hotel, Hanoi, Vietnam

La Thanh Hotel, Hanoi, Vietnam

Speaker

Dr Takehito Hayakawa (National Institute for Quantum and Radiological Science and Technology)

Description

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

Primary authors

Dr Takehito Hayakawa (National Institute for Quantum and Radiological Science and Technology) Dr Toshiyuki Shizuma (National Institutes for Quantum Science and Technology) Prof. Tsuyoshi Iizuka (The University of Tokyo)

Presentation Materials

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