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 J. 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…
179 Citations
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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…
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Toward an energy measurement of the internal conversion electron in the deexcitation of the
Th229
isomer
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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…
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- PhysicsNature
- 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.
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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…
Feasibility study of internal conversion electron spectroscopy of 229mTh
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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…
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