Laser spectroscopic characterization of the nuclear-clock isomer 229mTh

@article{Thielking2018LaserSC,
  title={Laser spectroscopic characterization of the nuclear-clock isomer 229mTh},
  author={Johannes Thielking and Maxim V. Okhapkin and Przemysław Głowacki and David M. Meier and Lars von der Wense and Benedict Seiferle and Christoph E D{\"u}llmann and Peter G. Thirolf and Ekkehard Peik},
  journal={Nature},
  year={2018},
  volume={556},
  pages={321-325}
}
The isotope 229Th is the only nucleus known to possess an excited state 229mTh in the energy range of a few electronvolts—a transition energy typical for electrons in the valence shell of atoms, but about four orders of magnitude lower than typical nuclear excitation energies. Of the many applications that have been proposed for this nuclear system, which is accessible by optical methods, the most promising is a highly precise nuclear clock that outperforms existing atomic timekeepers. Here we… Expand
X-ray pumping of the 229Th nuclear clock isomer
TLDR
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. Expand
The thorium-229 low-energy isomer and the nuclear clock
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 theExpand
Energy of the 229Th nuclear clock transition
TLDR
The method combines nuclear and atomic physics measurements to advance precision metrology, and the findings are expected to facilitate the application of high-resolution laser spectroscopy on nuclei and to enable the development of a nuclear optical clock of unprecedented accuracy. Expand
Hyperfine interaction with the Th-229 nucleus and its low-lying isomeric state
The thorium nucleus with mass number $A=229$ has attracted much interest because its extremely low lying first excited isomeric state at about $8$eV opens the possibility for the development of aExpand
The concept of laser-based conversion electron Mössbauer spectroscopy for a precise energy determination of 229mTh
Abstract229Th is the only nucleus currently under investigation for the development of a nuclear optical clock (NOC) of ultra-high accuracy. The insufficient knowledge of the first nuclear excitationExpand
Toward an energy measurement of the internal conversion electron in the deexcitation of the 229 Th isomer
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 theExpand
Towards a precise determination of the excitation energy of the Thorium nuclear isomer using a magnetic bottle spectrometer
Abstract 229Th is the only known nucleus with an excited state that offers the possibility for a direct laser excitation using existing laser technology. Its excitation energy has been measuredExpand
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh.
TLDR
The presented method allowed for a first direct identification of the decay of the thorium isomer, laying the foundations to study its decay properties as prerequisite for an optical control of this nuclear transition. Expand
Recent progress in laser spectroscopy of the actinides
The interest to perform laser spectroscopy in the heaviest elements arises from the strong impact of relativistic effects, electron correlations and quantum electrodynamics on their atomic structure.Expand
229DFT calculation of Thorium-doped Magnesium Fluoride for Nuclear Laser Spectroscopy.
TLDR
Using the Vienna Ab-initio Simulation Package (VASP), density functional theory (DFT) calculations of the electronic and optical properties of Th:MgF2 determine whether Thorium will be accepted as a dopant and identify the charge compensation mechanism and geometry, and indicate, that the band gap of Th-doped M gF2 will be significantly reduced compared to undoped Mgf2, below the expected229Th isomer energy. Expand
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