Abstract
An experiment is performed to observe photons of the isomeric transition of energy Eis ≈ 8 eV in 229mTh nuclei, obtained by eluting a hydrochloric acid solution from an ion-exchange column with 233U. Thorium in the solution exists in the form of 4+ ions, and isomeric transitions are possible due to the emission of photons only. The attenuation of photon emission gives the half-life of the isomer: T1/2 is ≈260 min.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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The authors remember fondly their senior colleague, the late Professor D.N. Suglobov, with whom we carried out this experimental work. We are also grateful to Professor Jonathan Lee of McGill University (Montreal, Canada), who participated in our discussion of the results from the experiment [11], and to Dr. F.F. Karpeshin from the Mendeleev Institute of Metrology (St. Petersburg) for regular discussions regarding isomer 229mTh.
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Koltsov, V.V., Kuzmina, T.E. Half-Life of 229mTh Isomers in an Acid Solution. Bull. Russ. Acad. Sci. Phys. 87, 1928–1932 (2023). https://doi.org/10.1134/S1062873823704312
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DOI: https://doi.org/10.1134/S1062873823704312