Measurement of the ^{229}Th Isomer Energy with a Magnetic Microcalorimeter.

@article{Sikorsky2020MeasurementOT,
  title={Measurement of the ^\{229\}Th Isomer Energy with a Magnetic Microcalorimeter.},
  author={Tomas Sikorsky and Jeschua Geist and Daniel Hengstler and Sebastian Kempf and Loredana Gastaldo and Christian Enss and Ch. Mokry and J{\"o}rg Runke and Christoph Emanuel D{\"u}llmann and Peter Wobrauschek and Kjeld Beeks and Veronika Rosecker and Johannes H. Sterba and G A Kazakov and Thorsten Schumm and Andreas Fleischmann},
  journal={Physical review letters},
  year={2020},
  volume={125 14},
  pages={
          142503
        }
}
We present a measurement of the low-energy (0-60 keV) γ-ray spectrum produced in the α decay of ^{233}U using a dedicated cryogenic magnetic microcalorimeter. The energy resolution of ∼10  eV, together with exceptional gain linearity, allows us to determine the energy of the low-lying isomeric state in ^{229}Th using four complementary evaluation schemes. The most precise scheme determines the ^{229}Th isomer energy to be 8.10(17) eV, corresponding to 153.1(32) nm, superseding in precision… 
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References

SHOWING 1-10 OF 54 REFERENCES

Metallic magnetic calorimeters

Metallic magnetic calorimeters (MMC) are calorimetric particle detectors, typically operated at temperatures below 100 mK, that make use of a paramagnetic temperature sensor to transform the…

Nuclear clocks based on resonant excitation of γ-transitions

Nuclear instruments and methods in physics research section B : beam interactions with materials and atoms

The impact-induced deposition of Al13 clusters with icosahedral structure on Ni(0 0 1) surface was studied by molecular dynamics (MD) simulation using Finnis–Sinclair potentials. The incident kinetic…

Nuclear data sheets for A = 107

AIP Conference Proceedings

Photoluminescence kinetics in InAs quantum dots in indirect-gap AlGaAs matrixes has been studied. It has been found that the duration of the photoluminescence decay at low temperatures greatly…

Nuclear Data Sheets for A = 108☆

Abstract This evaluation for A = 108 updates one by J. Blachot (1997B109), published in Nuclear Data Sheets 81, 599 (1997), mainly from XUNDL.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ING AND INDEXING

12th International Conference on Nuclear Reaction Mechanisms

  • 2009

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.

The 229-thorium isomer: doorway to the road from the atomic clock to the nuclear clock

The elusive ‘thorium isomer’, i.e. the isomeric first excited state of 229Th, has puzzled the nuclear and fundamental physics communities for more than 40 years. With an exceptionally low excitation…
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