Energy splitting of the ground-state doublet in the nucleus 229Th.

@article{Beck2007EnergySO,
  title={Energy splitting of the ground-state doublet in the nucleus 229Th.},
  author={B. R. Beck and John A. Becker and Peter Beiersdorfer and G V Brown and Kenton J. Moody and Jerry B. Wilhelmy and Frederick S. Porter and Caroline A. Kilbourne and Richard Lloyd Kelley},
  journal={Physical review letters},
  year={2007},
  volume={98 14},
  pages={
          142501
        }
}
The energy splitting of the 229Th ground-state doublet is measured to be 7.6+/-0.5 eV, significantly greater than earlier measurements. Gamma rays produced following the alpha decay of 233U (105 muCi) were counted in the NASA/electron beam ion trap x-ray microcalorimeter spectrometer with an experimental energy resolution of 26 eV (FWHM). A difference technique was applied to the gamma-ray decay of the 71.82 keV level that populates both members of the doublet. A positive correction amounting… Expand
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Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter☆
  • G. Kazakov, V. Schauer, +7 authors T. Schumm
  • Medicine, Physics
  • Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
  • 2014
TLDR
It is studied, how state-of-the-art magnetic metallic microcalorimeters with an energy resolution down to a few eV can be used to measure the isomer energy of Thorium-229 and the dependence of the attainable precision of the energy measurement on the signal and background count rates and the instrumental resolution. Expand
The 229Th Isomer Line as a Reference for a High-Precision Frequency Standard
The use of the nuclide 229Th as a new nuclear-optical frequency standard is studied theoretically. The mechanism for two-photon optical pumping of the 7.6 eV isomer through the optical shell in… Expand
Energy of the ^{229}Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference.
TLDR
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
Energy splitting between the first two quasi-particle states in 230Pa in comparison with the isotone 229Th
Excited states of the odd–odd isotope 230Pa have been identified by means of the one-neutron transfer reaction 231Pa(d→, t)230Pa at a beam energy of 22 MeV. The ground state of 230Pa is assigned to… 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 the… Expand
Determination of the ground-state hyperfine structure in neutral 229Th
The ground-state hyperfine structure of neutral 229Th has been measured for the first time using high-resolution resonance ionization spectroscopy. The measurements were performed as a preparatory… Expand
Proposed experimental method to determine alpha sensitivity of splitting between ground and 7.6 eV isomeric states in 229Th.
TLDR
Measurements of the differences of atomic transition frequencies between thorium atoms (or ions) with the nucleus in the ground state and in the first excited (isomeric) state are proposed to enable extraction of the change in nuclear charge radius and electric-quadrupole moment between the isomers, and hence the alpha dependence of the isomeric transition frequency with reasonable accuracy. 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
Feasibility study of internal conversion electron spectroscopy of 229mTh
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 has… Expand
Experimental search for the low-energy nuclear transition in 229Th with undulator radiation
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… Expand
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References

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