# Results of a Direct Search Using Synchrotron Radiation for the Low-Energy (229)Th Nuclear Isomeric Transition.

@article{Jeet2015ResultsOA,
title={Results of a Direct Search Using Synchrotron Radiation for the Low-Energy (229)Th Nuclear Isomeric Transition.},
author={J. Jeet and C. Schneider and Scott T. Sullivan and W. Rellergert and S. Mirzadeh and A. Cassanho and H. Jenssen and E. Tkalya and E. Hudson},
journal={Physical review letters},
year={2015},
volume={114 25},
pages={
253001
}
}
• J. Jeet, +6 authors E. Hudson
• Published 2015
• Physics, Medicine
• Physical review letters
We report the results of a direct search for the (229)Th (I(π)=3/2(+)←5/2(+)) nuclear isomeric transition, performed by exposing (229)Th-doped LiSrAlF(6) crystals to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence. We also use existing nuclear physics data to establish a range of possible transition strengths for the isomeric transition. We find no evidence for the thorium nuclear transition between 7.3 eV and 8.8 eV with transition lifetime (1-2) s… Expand

#### Figures, Tables, and Topics from this paper

X-ray pumping of the 229Th nuclear clock isomer
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
Energy of the ^{229}Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference.
The low-lying isomeric state of ^{229}Th provides unique opportunities for high-resolution laser spectroscopy of the atomic nucleus and is determined by taking the absolute energy difference between the excitation energy required to populate the 29.2-keV state and the energy emitted in its decay to the isomersic excited state. Expand
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
• Physics
• 2018
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
Laser-induced electronic bridge for characterization of the 229mTh → 229gTh nuclear transition with a tunable optical laser with a tunable optical laser
• Physics
• 2018
An alternative method to determine the excitation energy of the $~^{229\rm{m}}\rm{Th}$ isomer via the laser-induced electronic bridge is investigated theoretically. In the presence of an optical orExpand
Feasibility study of internal conversion electron spectroscopy of 229mTh
• Physics
• 2017
Abstract.With an expected energy of 7.8(5) eV, the isomeric first excited state in 229Th exhibits the lowest excitation energy of all known nuclei. Until today, a value for the excitation energy hasExpand
Laser spectroscopic characterization of the nuclear-clock isomer 229mTh
The laser spectroscopic investigation of the hyperfine structure of the doubly charged 229mTh ion and the determination of the fundamental nuclear properties of the isomer, namely, its magnetic dipole and electric quadrupole moments, as well as its nuclear charge radius are presented. Expand
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
Energy of the 229Th nuclear clock transition
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
229DFT calculation of Thorium-doped Magnesium Fluoride for Nuclear Laser Spectroscopy.
• Medicine, Materials Science
• Journal of physics. Condensed matter : an Institute of Physics journal
• 2020
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

#### References

SHOWING 1-10 OF 69 REFERENCES
Search for a low-lying 3 . 5-eV isomeric state in 229
We have extracted freshly produced Th atoms from 200 mg isotopically pure U in order to search for the radioactive decay of a 3.5 eV isomeric state in Th. A UV-sensitive photocathode, cooled andExpand
Improved Value for the Energy Splitting of the Ground-State Doublet in the Nucleus 229mTh
We have made an improved estimate of the {sup 229m}Th isomer energy. The new value, 7.8(5) eV, includes an estimate of possible spectral contamination effects due to the out-of-band E2 transitionExpand
"J."
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)Expand
Australas
• Phys. Eng. Sci. Med. 25, 102
• 2002
Annu
• Rev. Phys. Chem. 65, 197
• 2014
Annu. Rev. Phys. Chem
• Annu. Rev. Phys. Chem
• 2014
Phys
• Rev. C 89, 064310
• 2014
Phys. Rev. C
• Phys. Rev. C
• 2014
133
• 91
• 2013
J. Lumin
• J. Lumin
• 2013