Resonant Electronic-Bridge Excitation of the 
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 Nuclear Transition in Ions with Chaotic Spectra

Berengut, J. C.

doi:10.1103/physrevlett.121.253002

Cited by 20 publications

(16 citation statements)

References 54 publications

(76 reference statements)

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“…The electronic bridge has been studied for several nuclear transitions including the 76 eV 235 m U isomer, [ 29,74,76,77 ] the 8 eV 229 m Th isomer, [ 78–85 ] and the 3.05 keV nuclear transition starting from the 6 − 464 keV isomer of 84 Rb. [ 86 ] Laser‐induced electronic bridge has been proposed to determine the excitation energy of the 229 Th isomer in various charge states.…”

Section: Nuclear Spectroscopy In the Ion Beammentioning

confidence: 99%

Expanding Nuclear Physics Horizons with the Gamma Factory

et al. 2022

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The Gamma Factory (GF) is an ambitious proposal, currently explored within the CERN Physics Beyond Colliders program, for a source of photons with energies up to ≈400 MeV and photon fluxes (up to ≈1017 photons s−1) exceeding those of the currently available gamma sources by orders of magnitude. The high‐energy (secondary) photons are produced via resonant scattering of the primary laser photons by highly relativistic partially‐stripped ions circulating in the accelerator. The secondary photons are emitted in a narrow cone and the energy of the beam can be monochromatized, down to 10−3–10−6 level, via collimation, at the expense of the photon flux. This paper surveys the new opportunities that may be afforded by the GF in nuclear physics and related fields.

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Section: Nuclear Spectroscopy In the Ion Beammentioning

confidence: 99%

Expanding Nuclear Physics Horizons with the Gamma Factory

et al. 2022

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“…235m U, however, has an extraordinary long radiative lifetime of ≈ 10 24 s, 1 leading to no significant probability for direct laser excitation [405]. However, excitation via an electronic-bridge mechanism (see Appendix A.3.1) might be possible [22]. The special position of 229m Th compared to other nuclear isomeric states is shown in the energy-half-life diagram Fig.…”

Section: Nuclear Transition Requirementsmentioning

confidence: 99%

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

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The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

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“…The latest available literature value for the reduced transition probability is B ↓ (E3) = 0.036 W.u. [107]. One Weisskopf unit for an electric transition of arbitrary multipole order L is defined as [97] 1 W.u.…”

Section: The Case Of 229m Thmentioning

confidence: 99%

“…The problem gets even worse when considering that a higher harmonic order would be required for excitation. Nevertheless, laser excitation of 235m U could potentially be achieved via a sophisticated electronic bridge scheme in the 7+ charge state [107].…”

Section: The Case Of 229m Thmentioning

confidence: 99%

The theory of direct laser excitation of nuclear transitions

et al. 2020

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A comprehensive theoretical study of direct laser excitation of a nuclear state based on the density matrix formalism is presented. The nuclear clock isomer 229m Th is discussed in detail, as it could allow for direct laser excitation using existing technology and provides the motivation for this work. The optical Bloch equations are derived for the simplest case of a pure nuclear two-level system and for the more complex cases taking into account the presence of magnetic sub-states, hyperfine-structure and Zeeman splitting in external fields. Nuclear level splitting for free atoms and ions as well as for nuclei in a solid-state environment is discussed individually. Based on the obtained equations, nuclear population transfer in the low-saturation limit is reviewed. Further, nuclear Rabi oscillations, power broadening and nuclear twophoton excitation are considered. Finally, the theory is applied to the special cases of 229m Th and 235m U, being the nuclear excited states of lowest known excitation energies. The paper aims to be a didactic review with many calculations given explicitly.

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Resonant Electronic-Bridge Excitation of the U235 Nuclear Transition in Ions with Chaotic Spectra

Cited by 20 publications

References 54 publications

Expanding Nuclear Physics Horizons with the Gamma Factory

Expanding Nuclear Physics Horizons with the Gamma Factory

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

The theory of direct laser excitation of nuclear transitions

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