A5024121590- Radiation Detection and Scintillator Technologies
- Luminescence Properties of Advanced Materials
- Advanced Antenna and Metasurface Technologies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Advanced Semiconductor Detectors and Materials
- Advanced Frequency and Time Standards
- Inorganic Fluorides and Related Compounds
TU Wien
2023-2024
Abstract We have grown $$^{232}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mn>232</mml:mn> </mml:msup> </mml:math> Th:CaF $$_2$$ <mml:msub> <mml:mn>2</mml:mn> </mml:msub> and $$^{229}$$ <mml:mn>229</mml:mn> single crystals for investigations on the VUV laser-accessible first nuclear excited state of Th, with aim building a solid-state clock. To reach high doping concentrations despite extreme scarcity (and radioactivity) we scaled down crystal...
The <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mn>8</a:mn><a:mtext>−</a:mtext><a:mi>eV</a:mi></a:mrow></a:math> first nuclear excited state in <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Th</b:mi><b:mprescripts/><b:none/><b:mn>229</b:mn></b:mmultiscripts></b:math> is a candidate for implementing clock. Doping <c:math...
The 8 eV first nuclear excited state in $^{229}$Th is a candidate for implementing an clock. Doping into ionic crystals such as CaF$_2$ expected to suppress non-radiative decay, enabling spectroscopy and the realization of solid-state optical Yet, inherent radioactivity prohibits growth high-quality single with high concentration; radiolysis causes fluoride loss, increasing absorption at eV. We overcome this roadblock by annealing doped 1250$\unicode{x2103}$ CF$_4$. technique presented here...
We have grown $^{232}$Th:CaF$_2$ and $^{229}$Th:CaF$_2$ single crystals for investigations on the VUV laser-accessible first nuclear excited state of $^{229}$Th. To reach high doping concentrations despite extreme scarcity (and radioactivity) $^{229}$Th, we scaled down crystal volume by a factor 100 compared to established commercial or scientific growth processes. use vertical gradient freeze method 3.2 mm diameter seed with 2 drilled pocket, filled co-precipitated CaF$_2$:ThF$_4$:PbF$_2$...