Theoretical evaluation of decay mode of Th 229 m in solid samples
Year: 2025
Type: article
Abstract: The excitation energy of Th 229 m is extremely low at 8.4 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 Th 229 m 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 Th . The calculation results indicate that ion trap method, CaF 2 model, and MgF 2 one decay only via the γ -ray transition, whereas LiSrAlF 6 one decays via the γ -ray transition and has a possibility of decay via internal conversion and electron bridge.
Source: Physical Review Research
DOI: 10.1103/hn1b-51yx
Authors: Ryotaro Masuda, Tomoya Naito, Masashi Kaneko, Hiroyuki Kazama, So Hashiba, Kosuke Misawa, Yoshitaka Kasamatsu
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Awards: Theoretical predictions of particle yields after muon capture reactions for evaluations of soft-error upsets in memory devices, Unraveling the Mysteries of Heavy Element Synthesis through Systematic Collinear Resonant Laser Ionization Spectroscopy, Systematic study on isospin symmetry breaking based on nuclear density functional theory, G3009656961, 量子ソフトウェアと HPC・シミュレーション技術の共創によるサスティナブル AI 研究拠点, Theoretical development towards systematic studies of nuclear short-range correlation, Solvent extraction simulation of radioactive elements based on computational chemical analyses, 化学状態により変化するU-235mの核壊変の解明 核と電子の総合的理論計算への道, G5141982788, G5577879887, Understanding anti-spin-relaxation coatings for gaseous atoms from the inside of the coatings, G6775993198
OpenAlex ID: W4416685887