The nuclear structure of 229Th

Gulda, K.; Kurcewicz, W.; Aas, AJ; Borge, M. J. G.; Burke, D. G.; Fogelberg, B.; Grant, I. S.; Hagebø, E.; Kaffrell, Ν.; Kvasil, J.; Løvhøiden, G.; Mach, H.; Macková, Anna; Martínez, T.; Nyman, G.; Rubio, B.; Taín, J. L.; Tengblad, O.; Thorsteinsen, T.F.

doi:10.1016/s0375-9474(01)01456-7

Cited by 57 publications

(53 citation statements)

References 30 publications

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“…III) than b 29 , leading to a smaller shift of 0.2 eV and the currently accepted value of E is = 7.8 ± 0.5 eV. Interestingly, the same branching ratios can be obtained from the experimental data [46][47][48][49] for parameters of interband (see in Figure 1 Table III, where the probabilities of the inband transitions were calculated using the internal quadrupole moment Q 20 and the difference of the rotational and internal gyromagnetic ratio g R and g K , respectively (for the rotational band 5/2…”

Section: Energy Of the Nuclear Isomeric Levelsupporting

confidence: 71%

“…Such an experiment would ideally resolve the tension between the current results of Ref. [46][47][48][49]. This would allow accurate values of b 29 and b 42 to be calculated.…”

Section: Results Discussion and Request For Future Measurementsmentioning

confidence: 96%

“…Currently, we can only speculate of the possibility of anomalous internal conversion, since the accuracy of the measurements [47] were not sufficient. Therefore, it would be extremely useful if precise measurements of the internal conversion coefficients for interband magnetic dipole transitions between the bands K π [N n Z Λ] = 5/2 + [633] and 3/2 + [631] especially at the K and L atomic shells were performed.…”

Section: Importance Of the Electronic Conversion Decay Channelmentioning

confidence: 99%

“…Experimental data for B(M 1; 9/2 + 5/2[633](97.14 keV) → 7/2 + 3/2[631](71.83 keV)) are, to our knowledge, available from four separate experiments [46][47][48][49]. As can be seen in Fig.…”

Section: Matrix Element Of the Isomeric Transitionmentioning

confidence: 99%

“…III, the measurements of Refs. [46][47][48][49] can be used to bound the isomeric level half life. In this section we will use the radiation lifetime instead of half-life, which is traditionally used in atomic spectroscopy.…”

Section: Defining a Favored Area And Current Exclusionsmentioning

confidence: 99%

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Radiative lifetime and energy of the low-energy isomeric level inTh229

et al. 2015

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We estimate the range of the radiative lifetime and energy of the anomalous, low-energy 3/2 + (7.8± 0.5 eV) state in the 229 Th nucleus. Our phenomenological calculations are based on the available experimental data for the intensities of M 1 and E2 transitions between excited levels of the 229 Th nucleus in the K π [N nZ Λ] = 5/2 + [633] and 3/2 + [631] rotational bands. We also discuss the influence of certain branching coefficients, which affect the currently accepted measured energy of the isomeric state. From this work, we establish a favored region where the transition lifetime and energy should lie at roughly the 90% confidence level. We also suggest new nuclear physics measurements, which would significantly reduce the ambiguity in the present data.

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Section: Energy Of the Nuclear Isomeric Levelsupporting

confidence: 71%

“…Such an experiment would ideally resolve the tension between the current results of Ref. [46][47][48][49]. This would allow accurate values of b 29 and b 42 to be calculated.…”

Section: Results Discussion and Request For Future Measurementsmentioning

confidence: 96%

Section: Importance Of the Electronic Conversion Decay Channelmentioning

confidence: 99%

Section: Matrix Element Of the Isomeric Transitionmentioning

confidence: 99%

Section: Defining a Favored Area And Current Exclusionsmentioning

confidence: 99%

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Radiative lifetime and energy of the low-energy isomeric level inTh229

et al. 2015

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Unusual Isomers

Jain¹,

Maheshwari²,

Goel³

2021

Nuclear Isomers

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Coherent Control of Nuclei and X-Rays

Liao

2014

Springer Theses

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The possibility of mutual control of nuclei and photons offered by the emerging field of nuclear quantum optics is theoretically investigated in three different applications. This extension of quantum optics towards nuclei is motivated by modern X-ray Free Electron Lasers (XFEL) which open the possibility to coherently control nuclear states. As a first application we investigate the coherent population transfer between nuclear states in a three-level system driven by an XFEL. Such a level scheme is relevant for the triggering of isomers and might play a role for future energy storage solutions. The other way around, nuclei offer a platform to control single x-ray photons, which can be focused on spots essentially smaller than a single atom and used in future photonic circuits. The second part of this thesis puts forward a nuclear forward scattering setup that allows coherent control of a single x-ray photon using 57 Fe nuclei. Finally, we show that nuclear quantum optics provides a significant improvement for detection in nuclear physics. The low-lying isomeric transition of 229 Th can be addressed by VUV lasers and provides a potential next generation frequency standard. A main impediment is the large uncertainty of the nuclear transition frequency. Using an electromagnetically modified nuclear forward scattering setup, we show that coherence effects can reduce this uncertainty down to an unprecedented level.Within the framework of this thesis, the following articles were published in refereed journals:

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The nuclear structure of 229Th

Cited by 57 publications

References 30 publications

Radiative lifetime and energy of the low-energy isomeric level inTh229

Radiative lifetime and energy of the low-energy isomeric level inTh229

Unusual Isomers

Coherent Control of Nuclei and X-Rays

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