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First investigation of the morphological and luminescence properties of HfO$_2$ nanoparticles synthesized by photochemical synthesis
/ Villa, Irene (Prague, Inst. Phys.) ; Procházková, Lenka Prouzová (Prague, Inst. Phys. ; Prague, Tech. U.) ; Mihóková, Eva (Prague, Inst. Phys.) ; Babin, Vladimir (Prague, Inst. Phys.) ; Král, Robert (Prague, Inst. Phys.) ; Zemenová, Petra (Prague, Inst. Phys.) ; Falvey, Alexandra (Prague, Inst. Phys.) ; Čuba, Václav (Prague, Tech. U.) ; Salomoni, Matteo (CERN ; Milan Bicocca U.) ; Pagano, Fiammetta (CERN ; Milan Bicocca U.) et al.
For the first time, hafnia (HfO$_2$) nanoparticles have been produced by photochemical synthesis. The photochemical route has been proven to be scalable, affordable, and straightforward to create monoclinic HfO$_2$ nanoparticles with a size of tens of nanometers. [...]
2023 - 10 p.
- Published in : CrystEngComm 25 (2023) 4345-4354
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Timing performance of lead halide perovskite nanoscintillators embedded in a polystyrene matrix
/ Děcká, Kateřina (Prague, Tech. U. ; Prague, Inst. Phys.) ; Pagano, Fiammetta (CERN ; Milan Bicocca U.) ; Frank, Isabel (CERN ; LMU Munich (main)) ; Kratochwil, Nicolaus (CERN) ; Mihóková, Eva (Prague, Tech. U. ; Prague, Inst. Phys.) ; Auffray, Etiennette (CERN) ; Čuba, Václav (Prague, Tech. U.)
Nanomaterials like CsPbBr$_3$, benefiting from quantum confinement effects to feature ultra-fast decay time and tunable emission, are paving the way for the next generation of fast timing detectors. However, an ongoing challenge is to exploit their favorable properties in a full detector, given their size and instability. [...]
2022 - 8 p.
- Published in : J. Mater. Chem. 10 (2022) 12836-12843
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Compositional engineering of multicomponent garnet scintillators: towards an ultra-accelerated scintillation response
/ Martinazzoli, Loris (CERN ; Milan Bicocca U. ; INFN, Milan Bicocca) ; Nargelas, Saulius (Vilnius, Inst. Theor. Phys. Astron.) ; Boháček, Pavel (Prague, Inst. Phys.) ; Calá, Roberto (CERN ; Milan Bicocca U. ; INFN, Milan Bicocca) ; Dušek, Michal (Prague, Inst. Phys.) ; Rohlíček, Jan (Prague, Inst. Phys.) ; Tamulaitis, Gintautas (Vilnius, Inst. Theor. Phys. Astron.) ; Auffray, Etiennette (CERN) ; Nikl, Martin (Prague, Inst. Phys.)
Optical, luminescence and scintillation characteristics were studied in garnet-type GAGG single-crystal scintillators grown by the Czochralski method and heavily doped with a cerium activator and a magnesium codopant at different concentrations. Emission quenching due to the formation of closely spaced Ce–Mg pairs accelerating the photoluminescence and scintillation decays down to a few nanoseconds and substantial suppression of slower decay components are observed. [...]
2022 - 11 p.
- Published in : Materials Advances 3 (2022) 6842-6852
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Preparation and luminescence properties of ZnO:Ga – polystyrene composite scintillator
/ Burešová, Hana (NUVIA, Czech Republic) ; Procházková, Lenka (Prague, Tech. U.) ; Turtos, Rosana Martinez (Milan Bicocca U.) ; Jarý, Vítězslav (Prague, Inst. Phys.) ; Mihóková, Eva (Prague, Inst. Phys.) ; Beitlerová, Alena (Prague, Inst. Phys.) ; Pjatkan, Radek (NUVIA, Czech Republic) ; Gundacker, Stefan (CERN) ; Auffray, Etiennette (CERN) ; Lecoq, Paul (CERN) et al.
Highly luminescent ZnO:Ga-polystyrene composite (ZnO:Ga-PS) with ultrafast subnanosecond decay was prepared by homogeneous embedding the ZnO:Ga scintillating powder into the scintillating organic matrix. The powder was prepared by photo-induced precipitation with subsequent calcination in air and Ar/H2 atmospheres. [...]
2016 - 10 p.
- Published in : Opt. Express 24 (2016) 15289
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Effect of $Li^+$ ions co-doping on luminescence, scintillation properties and defects characteristics of LuAG:Ce ceramics
/ Liu, Shuping (Shanghai Inst. Ceramics) ; Feng, Xiqi (Shanghai Inst. Ceramics) ; Mares, Jiri A (Prague, Inst. Phys.) ; Babin, Vladimir (Prague, Inst. Phys.) ; Hu, Chen (Shanghai Inst. Ceramics) ; Kou, Huamin (Shanghai Inst. Ceramics) ; D'Ambrosio, Carmelo (CERN) ; Li, Jiang (Shanghai Inst. Ceramics) ; Pan, Yubai (Shanghai Normal U.) ; Nikl, Martin (Prague, Inst. Phys.)
Monovalent $Li^+$ codoped $Lu_3Al_5O_{12}$:Ce (LuAG:Ce) optical ceramics were fabricated by solid state reaction method and further optimized by an air-annealing process. Optical absorption, radioluminescence spectra and scintillation properties such as light yield, scintillation decay times and afterglow were measured and compared with those of the $Li^+$ free LuAG:Ce ceramic and the commercial LuAG:Ce single crystal samples. [...]
2017 - 5 p.
- Published in : Opt. Mater. 64 (2017) 245-249
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Effect of reducing $Lu^{3+}$ content on the fabrication and scintillation properties of non-stoichiometric $Lu_{3}−_{x}Al_5O_{12}$:Ce ceramics
/ Liu, Shuping (Shanghai Inst. Ceramics ; Beijing, GUCAS) ; Mares, Jiri A (Prague, Inst. Phys.) ; Babin, Vladimir (Prague, Inst. Phys.) ; Hu, Chen (Shanghai Inst. Ceramics) ; Kou, Huamin (Shanghai Inst. Ceramics) ; D’Ambrosio, Carmelo (CERN) ; Pan, Yubai (Shanghai Normal U.) ; Nikl, Martin (Prague, Inst. Phys.)
$Lu_{3}−_{x}Al_5O_{12}$:Ce optical ceramics ($Lu_3−_{x}AG:Ce,$ x = 1, 2, 3 and 4 at.%, respectively) with $Lu^{3+}$ compositions ranging from 1 to 4 at.% below stoichiometry content were fabricated by solid state reaction method and further optimized by an air-annealing process. The effect of $Lu^{3+}$ deficiency on the optical, luminescence and scintillation properties of such a non-stoichiometric $Lu_3−_{x}Al_5O_{12}$:Ce ceramics was investigated. [...]
2017 - 6 p.
- Published in : Opt. Mater. 63 (2017) 179-184
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The second data release from the European Pulsar Timing Array - IV. Implications for massive black holes, dark matter, and the early Universe
/ EPTA Collaboration
The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and first data releases respectively, with the correlation properties of a gravitational wave background (GWB). Such signal may have its origin in a number of physical processes including a cosmic population of inspiralling supermassive black hole binaries (SMBHBs); inflation, phase transitions, cosmic strings and tensor mode generation by non-linear evolution of scalar perturbations in the early Universe; oscillations of the Galactic potential in the presence of ultra-light dark matter (ULDM). [...]
arXiv:2306.16227.-
2024-05-01 - 30 p.
- Published in : Astron. Astrophys. 685 (2024) A94
Fulltext: document - PDF; 2306.16227 - PDF;
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