Theoretical evaluation of decay mode of $ {}^{229m} \mathrm{Th} $ in solid samples
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915693695336448 |
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| author | Masuda, Ryotaro Naito, Tomoya Kaneko, Masashi Kazama, Hiroyuki Hashiba, So Misawa, Kosuke Kasamatsu, Yoshitaka |
| author_facet | Masuda, Ryotaro Naito, Tomoya Kaneko, Masashi Kazama, Hiroyuki Hashiba, So Misawa, Kosuke Kasamatsu, Yoshitaka |
| contents | The excitation energy of $ {}^{229m} \mathrm{Th} $ is extremely low at $ 8.4 \, \mathrm{eV} $; thus, this isotope exhibits changes in its decay modes depending on the chemical state, specifically the outermost electronic states. However, the reported half-lives of the $ γ$-ray transition are not consistent among the previous experiments. In this study, we investigate the chemical states of $ {}^{229m} \mathrm{Th} $ by density functional theory calculations. Based on these results, we evaluate the relationship between the experimental half-life of each sample and the electronic state of $ \mathrm{Th} $. The calculation results indicate that ion trap method, $ \mathrm{Ca} \mathrm{F}_2 $ model and $ \mathrm{Mg} \mathrm{F}_2 $ one decay only via the $ γ$-ray transition, whereas $ \mathrm{Li} \mathrm{Sr} \mathrm{Al} \mathrm{F}_6 $ one decays via the $ γ$-ray transition and has a possibility of decay via internal conversion and electron bridge. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_09064 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Theoretical evaluation of decay mode of $ {}^{229m} \mathrm{Th} $ in solid samples Masuda, Ryotaro Naito, Tomoya Kaneko, Masashi Kazama, Hiroyuki Hashiba, So Misawa, Kosuke Kasamatsu, Yoshitaka Atomic Physics Other Condensed Matter Nuclear Experiment Nuclear Theory Chemical Physics The excitation energy of $ {}^{229m} \mathrm{Th} $ is extremely low at $ 8.4 \, \mathrm{eV} $; thus, this isotope exhibits changes in its decay modes depending on the chemical state, specifically the outermost electronic states. However, the reported half-lives of the $ γ$-ray transition are not consistent among the previous experiments. In this study, we investigate the chemical states of $ {}^{229m} \mathrm{Th} $ by density functional theory calculations. Based on these results, we evaluate the relationship between the experimental half-life of each sample and the electronic state of $ \mathrm{Th} $. The calculation results indicate that ion trap method, $ \mathrm{Ca} \mathrm{F}_2 $ model and $ \mathrm{Mg} \mathrm{F}_2 $ one decay only via the $ γ$-ray transition, whereas $ \mathrm{Li} \mathrm{Sr} \mathrm{Al} \mathrm{F}_6 $ one decays via the $ γ$-ray transition and has a possibility of decay via internal conversion and electron bridge. |
| title | Theoretical evaluation of decay mode of $ {}^{229m} \mathrm{Th} $ in solid samples |
| topic | Atomic Physics Other Condensed Matter Nuclear Experiment Nuclear Theory Chemical Physics |
| url | https://arxiv.org/abs/2507.09064 |