A5007543084- Atomic and Subatomic Physics Research
- Inorganic Fluorides and Related Compounds
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Luminescence Properties of Advanced Materials
- Spacecraft and Cryogenic Technologies
- Crystallography and Radiation Phenomena
- Methane Hydrates and Related Phenomena
- Radiation Detection and Scintillator Technologies
- Crystal Structures and Properties
- Engineering Applied Research
- Nuclear physics research studies
- Quantum Information and Cryptography
- Quantum, superfluid, helium dynamics
- Quantum Computing Algorithms and Architecture
- High voltage insulation and dielectric phenomena
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
TU Wien
2020-2024
The radioisotope thorium-229 (
When Th nuclei are doped in ${\mathrm{CaF}}_{2}$ crystals, a set of electronic defect states appear the crystal band gap which would otherwise provide complete transparency to vacuum-ultraviolet radiation. The coupling these 8 eV $^{229m}\mathrm{Th}$ nuclear isomer is investigated theoretically. We show that although previously viewed as nuisance, starting point for excitation via bridge mechanisms involving stimulated emission or absorption using an optical laser. rates processes at least 2...
The radioisotope Th-229 is renowned for its extraordinarily low-energy, long-lived nuclear first-excited state. This isomeric state can be excited by VUV lasers and the transition from ground has been proposed as a reference ultra-precise clocks. Such clocks will find multiple applications, ranging fundamental physics studies to practical implementations. Recent investigations extracted valuable constraints on energy lifetime, populating isomer in stochastic decay of U-233 or Ac-229....
The 229thorium nucleus has an extremely low-energy isomeric state that could be manipulated with light in the vacuum ultraviolet (VUV) range. Recent measurements based on internal conversion electrons place isomer energy at 8.28(17) eV (Seiferle B et al 2019), within transmission window of large-band-gap materials, such as fluoride single crystals. Doping 229Th into VUV-transparent materials realizes a spectroscopy target high nuclei density and might form basis solid-state nuclear clock....
Among all the nuclei, Thorium-229 has lowest excited level at approximately 8.3 eV. This is an isomeric state with a long radiative lifetime. Therefore, $$\mathbf {^{229}}$$ Th can be to using vacuum ultraviolet laser and expected have applications such as in frequency standards. Our group been conducting experiments excite via second high-intensity X-ray beam available SPring-8 facility. To detect photons from of Th, dedicated apparatus was constructed. We employed Th-doped CaF $$_2$$...
The electronic defect states resulting from doping $^{229}\mathrm{Th}$ in ${\mathrm{CaF}}_{2}$ offer a unique opportunity to excite the nuclear isomeric state $^{229\mathrm{m}}\mathrm{Th}$ at approximately 8 eV via bridge mechanisms. We consider schemes involving stimulated emission and absorption using an optical laser. role of different multipole contributions, both for emitted or absorbed photon transition, total rates are investigated theoretically. show that electric dipole component is...
Precision laser spectroscopy of the 229-thorium nuclear isomer transition in a solid-state environment would represent significant milestone field metrology, opening door to realization clock. Working toward this goal, experimental methods require knowledge various properties large band-gap material, such as calcium fluoride doped with specific isotopes heavy elements thorium, actinium, cerium, neptunium, and uranium. By accurately determining atomic structure potential charge compensation...
Abstract The large band gap insulator LiCaAlF 6 (LiCAF) has been proposed as a possible host crystal for future realizations of solid‐state based thorium‐229 nuclear clock, due to its excellent optical transmission in the vacuum ultraviolet range. To enable direct manipulation thorium isomeric state, remain larger than excitation energy upon doping. Here, systematic search charge compensation mechanisms, defect locations, and emergence other compounds, using density functional theory, is...