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Nuclear Spectroscopy of 229 Th: New Measurements and Applications

Nuclear Spectroscopy of 229 Th: New Measurements and Applications. Determining the ground-state doublet in the nucleus 229 Th. The doublet has a remarkable small split on the ground state and, besides the fact of being curious, has several applications since can be excited by a laser source.

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Nuclear Spectroscopy of 229 Th: New Measurements and Applications

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  1. Nuclear Spectroscopy of 229Th:New Measurements and Applications Determining the ground-state doublet in the nucleus 229Th The doublet has a remarkable small split on the ground state and, besides the fact of being curious, has several applications since can be excited by a laser source. Davi Ortega This new technique measured the doublet to be 7.6 eV. This is twice as big as the latest measurement and explains why it couldn’t be direct measured.

  2. Measurement done by a microcalorimeter, the idea is to measure the decay of 71.82 keV to the doublet ground state. Spectra resolved by the XRS (NASA). The high resolution of 6 eV (FWHM) allowed the measurement of this transitions with a x-ray spectrometer.

  3. The microcalorimeterA x-ray photon hits the absorber that heats up. A thermistor measure the temperature and therefore determines the photon’s energy. After the absorbtion the heatsink “reset” the temperature of the thermistor. Application: Frequency Standard • Clocks needs: • Oscillator • Counter • Stability and Acuracy • Comes from the oscillator • Thorium Resonance. • 229Th ground split is small enough to be excited by a UV Laser. • Electron Shelving: • Advantages: • Quality of Factor: 1020 • High stability • Insensitive to external perturbations. • Laser Cooled • Single Ion Trapping.

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