Search for a “3.5-eV isomer” in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Th</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>229</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>in a hollow-cathode electric discharge

Inamura, T.; Haba, Hiromitsu

doi:10.1103/physrevc.79.034313

Cited by 33 publications

(23 citation statements)

References 30 publications

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“…The results differ from each other by several orders of magnitude, changing from a few minutes [5] to many hours [6]. Hence, new experimental and theoretical investigations are required.…”

Section: Introductionmentioning

confidence: 94%

Effect of atomic electrons on the7.6-eV nuclear transition inTh2293+<

Porsev

Flambaum

2010

Phys. Rev. A

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We have considered an effect of atomic electrons on the nuclear 229m Th-229g Th transition in 229 Th 3+ due to the electronic bridge process. Based on a recent experimental result we assumed the energy difference between the isomeric and the ground nuclear states to be equal to 7.6 eV. We have calculated the ratios of the electronic bridge process probability ( EB ) to the probability of the nuclear radiative transition ( N ) for the electronic 5f 5/2 → 6d 3/2 , 6d 5/2 , 7s and the 7s → 7p 1/2 , 7p 3/2 transitions and found EB / N ∼ 0.01-0.1 for the former and EB / N ∼ 20 for the latter.

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“…The results differ from each other by several orders of magnitude, changing from a few minutes [5] to many hours [6]. Hence, new experimental and theoretical investigations are required.…”

Section: Introductionmentioning

confidence: 94%

Effect of atomic electrons on the7.6-eV nuclear transition inTh2293+<

Porsev

Flambaum

2010

Phys. Rev. A

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“…Experiments give values of this frequency ω N ranging from 3.5 ± 1.0 eV [2] to 7.6 ± 0.5 eV [3]. The measurements of the lifetime of the isomeric state performed by different experimental groups lead to values which differ from each other by many orders of magnitude (see, e.g., [4,5]). …”

Section: Introductionmentioning

confidence: 99%

Electronic bridge process inTh229+

2010

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We have studied the effect of atomic electrons on the nuclear transition from the isomeric 229m Th state to the ground 229g Th state in 229 Th + due to the electronic bridge process. The exact value of the nuclear transition frequency is unknown so far; therefore, we have developed a formalism that can be used for any nuclear transition frequency. We have calculated positions of several high-lying even-parity states which are not presented in experimental atomic spectra databases. We have found their energy levels and g factors.

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“…These measurements generated either false results2122 that were soon refuted2324, or null672526 results. The lifetime of the isomeric state is expected to be on the order of 1,000 s32728.…”

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confidence: 99%

Radioluminescence and photoluminescence of Th:CaF2 crystals

Stellmer

Schreitl

Schumm

2015

Sci Rep

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We study thorium-doped CaF2 crystals as a possible platform for optical spectroscopy of the 229Th nuclear isomer transition. We anticipate two major sources of background signal that might cover the nuclear spectroscopy signal: VUV-photoluminescence, caused by the probe light, and radioluminescence, caused by the radioactive decay of 229Th and its daughters. We find a rich photoluminescence spectrum at wavelengths above 260 nm, and radioluminescence emission above 220 nm. This is very promising, as fluorescence originating from the isomer transition, predicted at a wavelength shorter than 200 nm, could be filtered spectrally from the crystal luminescence. Furthermore, we investigate the temperature-dependent decay time of the luminescence, as well as thermoluminescence properties. Our findings allow for an immediate optimization of spectroscopy protocols for both the initial search for the nuclear transition using synchrotron radiation, as well as future optical clock operation with narrow-linewidth lasers.

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Search for a “3.5-eV isomer” inTh229in a hollow-cathode electric discharge

Cited by 33 publications

References 30 publications

Effect of atomic electrons on the7.6-eV nuclear transition inTh2293+<

Effect of atomic electrons on the7.6-eV nuclear transition inTh2293+<

Electronic bridge process inTh229+

Radioluminescence and photoluminescence of Th:CaF2 crystals

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