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Half-life of the nuclear cosmochronometer 176Lu measured with a windowless 4π solid angle scintillation detector
https://repo.qst.go.jp/records/2000863
https://repo.qst.go.jp/records/200086362a1cca1-e23f-4b66-a226-9a0cfed9f55b
| アイテムタイプ | 学術雑誌論文 / Journal Article(1) | |||||||||||
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| 公開日 | 2025-04-14 | |||||||||||
| タイトル | ||||||||||||
| タイトル | Half-life of the nuclear cosmochronometer 176Lu measured with a windowless 4π solid angle scintillation detector | |||||||||||
| 言語 | en | |||||||||||
| 言語 | ||||||||||||
| 言語 | eng | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | journal article | |||||||||||
| 著者 |
Takehito Hayakawa
× Takehito Hayakawa
× Toshiyuki Shizuma
× Tsuyoshi Iizuka
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | An unstable isotope 176Lu decays to 176Hf with a half-life of approxi- mately 4x10^10 y. The 176Lu-176Hf system has a potential as a nuclear chronometer for dating astrophysical and geological events. However, the half-lives measured with various nuclear experiments are inconsistent. Furthermore, the half-lives evaluated from Lu-Hf isochron in meteorites and terrestrial rocks whose age was determined by the U-Pb system show two different values. Here we report a half-life measured using a new method that is not sensitive to various parameters such as nuclear structure or detection effciency. We measure 176Lu decay using a windowless 4pi solid angle detec- tor based upon bismuth germanate (BGO) scintillation crystals with a total detection effciency of approximately 99.9%, where a natural Lu sample is located inside of the detector. The measured half-life of (3.719+-12)x10^10 y is consistent with that obtained from the analysis of terrestrial materials within the uncertainty. This suggests that an unre- solved mechanism is required to explain the shorter half-life obtained from some meteorites. We discuss a possibility that the decay acceler- ation of 176Lu by neutron inelastic scattering caused by cosmic-rays. |
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| 書誌情報 |
Communications Physics 巻 6, p. 299, 発行日 2023-11 |
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| 出版者 | ||||||||||||
| 出版者 | Springer Nature | |||||||||||
| ISSN | ||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||
| 収録物識別子 | 2399-3650 | |||||||||||
| DOI | ||||||||||||
| 識別子タイプ | DOI | |||||||||||
| 関連識別子 | 10.1038/s42005-023-01406-7 | |||||||||||
