# Nuclear clocks based on resonant excitation of γ-transitions

@article{Peik2015NuclearCB,
title={Nuclear clocks based on resonant excitation of $\gamma$-transitions},
author={Ekkehard Peik and Maxim V. Okhapkin},
journal={Comptes Rendus Physique},
year={2015},
volume={16},
pages={516-523}
}
• Published 25 February 2015
• Physics
• Comptes Rendus Physique
67 Citations

## Figures from this paper

Towards a measurement of the nuclear clock transition in 229Th
• Physics
• 2016
We investigate a potential candidate for a future optical clock: the nucleus of the isotope 229Th. Over the past 40 years of research, various experiments have found evidence for the existence of an
Nuclear clocks for testing fundamental physics
• Physics
Quantum Science and Technology
• 2021
The low-energy, long-lived isomer in 229Th, first studied in the 1970s as an exotic feature in nuclear physics, continues to inspire a multidisciplinary community of physicists. It has stimulated
The thorium-229 low-energy isomer and the nuclear clock
• Physics
• 2021
The 229Th nucleus has an isomeric state at an energy of about 8 eV above the ground state, several orders of magnitude lower than typical nuclear excitation energies. This has inspired the
X-ray pumping of the 229Th nuclear clock isomer
• Physics
Nature
• 2019
Active optical pumping is presented using narrow-band 29-kiloelectronvolt synchrotron radiation to resonantly excite the second excited state of 229Th, which then decays predominantly into the isomer, enabling accurate determination of the 229mTh isomer’s energy, half-life and excitation linewidth.
Towards coherent control of the 229Th isomeric transition in VUV-transparent crystals
The Th isomeric state at approximately 8.28 eV has generated significant interest as a possible candidate for the development of a nuclear clock with cutting edge precision and stability. One of the
Nuclear physics: Elusive transition spotted in thorium
Direct detection of the thorium-229 nuclear-clock transition is achieved, placing new limits on the transition energy and measuring the state's half-life, and these results suggest that nuclear quantum optics and nuclear lasers based on this transition may be plausible possibilities.
Direct detection of the 229Th nuclear clock transition
• Physics
Nature
• 2016
The direct detection of this nuclear state of 229mTh is reported, which is further confirmation of the existence of the isomer and lays the foundation for precise studies of its decay parameters.
Concepts for direct frequency-comb spectroscopy of 229mTh and an internal-conversion-based solid-state nuclear clock
• Physics
• 2020
A new concept for narrow-band direct nuclear laser spectroscopy of 229m Th is proposed, using a single comb mode of a vacuum ultraviolet frequency comb generated from the 7th harmonic of an Yb-doped
Toward an energy measurement of the internal conversion electron in the deexcitation of the Th229 isomer
• Physics
Physical Review C
• 2018
The first excited isomeric state of Th-229 has an exceptionally low energy of only a few eV and could form the gateway to high-precision laser spectroscopy of nuclei. The excitation energy of the

## References

SHOWING 1-10 OF 92 REFERENCES
Performance of a 229 Thorium solid-state nuclear clock
• Physics
• 2012
The 7.8 eV nuclear isomer transition in 229thorium has been suggested as a clock transition in a new type of optical frequency standard. Here we discuss the construction of a ‘solid-state nuclear
Nuclear laser spectroscopy of the 3.5 eV transition in Th-229
• Physics
• 2003
We propose high-resolution laser spectroscopy of the 3.5 eV nuclear transition in Th-229 in isolated atoms. Laser excitation of the nucleus can be detected efficiently in a double-resonance method by
Experimental search for the low-energy nuclear transition in 229Th with undulator radiation
• Physics, Chemistry
• 2015
To search for the lowest energy nuclear isomeric transition in 229Th in solid samples, a novel adsorption technique which prepares 229Th atoms on a surface of CaF2 is developed. Adsorbed 229Th is
Towards a direct transition energy measurement of the lowest nuclear excitation in229Th
• Physics
• 2013
The isomeric first excited state of the isotope 229Th exhibits the lowest nuclear excitation energy in the whole landscape of known atomic nuclei. For a long time this energy was reported in the
Constraining the evolution of the fundamental constants with a solid-state optical frequency reference based on the 229Th nucleus.
• Physics
Physical review letters
• 2010
It is argued that the 229Th optical nuclear transition may be driven inside a host crystal with a high transition Q to allow for the construction of a solid-state optical frequency reference that surpasses the short-term stability of current optical clocks, as well as improved limits on the variability of fundamental constants.
Two-photon laser excitation of trapped 232 Th + ions via the 402 nm resonance line
• Physics
• 2012
is driven by radiation froman extended cavity diode laser. Spontaneous decay of the intermediate state populates a numberof low-lying metastable states, thus limiting the excited state population and
Coherence-enhanced optical determination of the 229Th isomeric transition.
• Physics, Chemistry
Physical review letters
• 2012
In order to obtain a unmistakable signature of the isomeric nuclear fluorescence, a novel scheme for the direct measurement of the transition energy via electromagnetically modified nuclear forward scattering involving two fields that couple to three nuclear states is put forward.
Excitation of the isomeric 229mTh nuclear state via an electronic bridge process in 229Th+.
• Physics
Physical review letters
• 2010
Based on calculations of the electronic level structure of Th+ which combine the configuration-interaction method and many-body perturbation theory, it is estimated that a nuclear excitation rate in the range of 10  s⁻¹ can be obtained using conventional laser sources.
Processes of the nuclear isomer 229mTh(3/2+, 3.5 ± 1.0 eV) resonant excitation by optical photons
• Physics
• 1996
The excitation processes of the low energy isomeric level in nucleus 229Th by optical photons are investigated for different values of relations between energies of nuclear transition and photons.