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Impact of the ionization of the atomic shell on the lifetime of the $^{229m}$Th isomer
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abstract
Contemporary data are analyzed concerning the half-lives of the $^{229m}$Th isomer in neutral atoms and various ions. It is explicitly shown that the isomer lifetime may strongly depend on the plain environmental physical conditions like pressure and temperature. Calculation is performed on the united platform of interplay of traditional and subthreshold resonance conversion. General agreement with experiment is obtained in the cases of Th$^I$ and Th$^{III}$, a prediction is made concerning Th$^{IV}$. Disagreement with the experiment in the case of Th$^{II}$ may be a consequence of a random very sharp resonance with an electronic level. Account of the influence of the environment on the decay rate helps one to loose the resonance condition, which may lead to agreement with experiment. This will mean the first experimental observation of strong dependence of the nuclear decay rate on the environment.
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Cited by 1 Pith paper
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Study of thorium in hypersonic gas jets: Ionization potentials of Th and Th$^+$
Precision resonance ionization spectroscopy in a hypersonic gas jet yields the first ionization potential of thorium at 6.306879(14) eV and the second at 12.300(9) eV, using a new Rydberg-series field-ionization technique.
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