Search results for "scintillator"

showing 10 items of 172 documents

Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics

2021

The authors acknowledge the expert help of the staff of MAX IV Laboratory. The research leading to this result has been supported by the project CALIPSOplus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. I.V. acknowledges the support of Russian Foundation for Basic Research # 20-52-S52001.

Materials scienceAbsorption spectroscopyExcitonBiophysicsAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyBiochemistryCeSynchrotronTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITYSpectroscopy:NATURAL SCIENCES::Physics [Research Subject Categories]General Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and OpticsXANESXANES0104 chemical sciencesAbsorption edgeCe4+Absorption bandEnergy transferGarnet scintillatorsExcited stateExcitons0210 nano-technologyLuminescence
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Luminescence Center Excited State Absorption in Calcium and Zinc Tungsates

2002

The tungstate crystals are well known scintillators. The mechanism of luminescence center formation and the luminescence center model are under discussion today. The results of time-resolved spectroscopy of luminescence center in ZnWO4 and CaWO4 in wide temperature regions was presented. The luminescence and induced absorption under pulsed electron beam excitation (pulse duration 10 ns, 0.26 MeV) were studied. The experimental equipment used allows one to obtain the transient absorption spectra, luminescence decay kinetics and transient absorption relaxation times.

Materials scienceCondensed Matter::OtherRelaxation (NMR)Physics::OpticsScintillatorCondensed Matter::Materials Sciencechemistry.chemical_compoundTungstatechemistryUltrafast laser spectroscopyPhysics::Atomic and Molecular ClustersAtomic physicsLuminescenceSpectroscopyAbsorption (electromagnetic radiation)Excitation
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Time-Resolved Luminescence Characteristics of Cerium Doped YAG Nanocrystals

2007

Time-resolved luminescence characteristics have been studied for cerium doped YAG nanopowders (NP) and nanostructured ceramics (NC). The results obtained have been compared to the luminescence characteristics for the well studied YAG:Ce3+ single crystal (SC). It was detected that the luminescence decay kinetics of Ce3+ related emission in nanocrystals can be closely approximated by two exponents, whereas a single exponential decay was observed in the single crystal. It was also found that the luminescence decay time and light yield of Ce3+ emission are strongly dependent on the cerium concentration and an unusual concentration quenching of Ce3+ emission was observed in YAG nanocrystals. The…

Materials scienceDopingAnalytical chemistrychemistry.chemical_elementMineralogyScintillatorCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCeriumchemistryNanocrystalGeneral Materials ScienceExponential decayLuminescenceSingle crystalSurface statesSolid State Phenomena
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Luminescence and Transient Optical Absorption in CdWO<sub>4</sub>

1997

Materials scienceMechanical EngineeringAnalytical chemistryScintillatorCondensed Matter Physicschemistry.chemical_compoundchemistryMechanics of MaterialsUltrafast laser spectroscopyCadmium tungstateGeneral Materials ScienceTransient (oscillation)LuminescenceAbsorption (electromagnetic radiation)Materials Science Forum
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Influence of boron on the essential properties for new generation scintillators

2021

Abstract Cerium doped yttrium aluminum (YAG:Ce) and lutetium aluminum garnets (LuAG:Ce) are some of the most popular materials used as scintillators. While the scintillators themselves are materials that absorb and convert high-energy radiation into light. The decay time in YAG:Ce and LuAG:Ce is about 60 ns, therefore the essential task for their improvement would be to shorten it as much as possible. For this reason, in this work, the aforementioned garnets were doped with different amounts of boron. B3+ ion has a suitable neutron capture cross section and can therefore absorb gamma radiation. Because of the extremely strong absorption of thermal neutrons and the weak interaction with MeV …

Materials scienceMechanical EngineeringDopingMetals and AlloysGamma rayAnalytical chemistrychemistry.chemical_element02 engineering and technologyYttriumScintillator010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesLutetiumNeutron temperature0104 chemical sciencesCeriumchemistryMechanics of MaterialsMaterials Chemistry0210 nano-technologyBoronJournal of Alloys and Compounds
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Pyroelectric activity of LiGaO2, Li2GeO3, Li2B4O7 and LiNbO3 crystals: Pyroelectric luminescence and excitation of cathodoluminescence in scintillato…

2020

Abstract Basing on results of electric, spectral and kinetic measurements of spontaneous luminescence caused by cooling/heating in pyroelectric crystals LiGaO2, Li2GeO3, Li2B4O7 and LiNbO3 a mechanism of pyroelectric luminescence is proposed. Series of experiments were undertaken attaching a scintillating phosphor ScPO4 to a pyroelectric crystal and subjecting a pair of the bounded crystals to cooling/heating process. Pyroelectric activity causes not only pyroluminescence in pyroelectric crystals but also luminescence in a ScPO4, which is characterized with high intensity and kinetic and spectral properties typical for the intrinsic luminescence of a scintillator.

Materials sciencePhotoluminescencebusiness.industryOrganic ChemistryCathodoluminescencePhosphor02 engineering and technologyScintillator010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsPyroelectricityInorganic ChemistryOptoelectronicsElectrical and Electronic EngineeringPhysical and Theoretical Chemistry0210 nano-technologyLuminescencebusinessPyroelectric crystalSpectroscopyExcitationOptical Materials
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A Design of Scintillator Tiles Read Out by Surface-Mounted SiPMs for a Future Hadron Calorimeter

2015

Precision calorimetry using highly granular sampling calorimeters is being developed based on the particle flow concept within the CALICE collaboration. One design option of a hadron calorimeter is based on silicon photomultipliers (SiPMs) to detect photons generated in plastic scintillator tiles. Driven by the need of automated mass assembly of around ten million channels stringently required by the high granularity, we developed a design of scintillator tiles directly coupled with surface-mounted SiPMs. A cavity is created in the center of the bottom surface of each tile to provide enough room for the whole SiPM package and to improve collection of the light produced by incident particles…

Materials sciencePhotonPhysics - Instrumentation and Detectorsbusiness.industryDynamic rangePhysics::Instrumentation and DetectorsFOS: Physical sciencesCosmic rayInstrumentation and Detectors (physics.ins-det)ScintillatorOpticsSilicon photomultiplierSampling (signal processing)visual_artvisual_art.visual_art_mediumTilePhotonicsDetectors and Experimental Techniquesbusinessphysics.ins-det
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SiPMs coated with TPB: coating protocol and characterization for NEXT

2012

[EN] Silicon photomultipliers (SiPM) are the photon detectors chosen for the tracking readout in NEXT, a neutrinoless \bb decay experiment which uses a high pressure gaseous xenon time projection chamber (TPC). The reconstruction of event track and topology in this gaseous detector is a key handle for background rejection. Among the commercially available sensors that can be used for tracking, SiPMs offer important advantages, mainly high gain, ruggedness, cost-effectiveness and radio-purity. Their main drawback, however, is their non sensitivity in the emission spectrum of the xenon scintillation (peak at 175 nm). This is overcome by coating these sensors with the organic wavelength shifte…

Materials sciencePhysics - Instrumentation and DetectorsFOS: Physical scienceschemistry.chemical_elementengineering.materialWavelength shifterTracking (particle physics)7. Clean energy01 natural sciencesHigh Energy Physics - ExperimentTECNOLOGIA ELECTRONICAHigh Energy Physics - Experiment (hep-ex)XenonSilicon photomultiplierCoating0103 physical sciencesSensitivity (control systems)Visible and IR photons (solid-state)010306 general physicsInstrumentationPhoton detectors for UVMathematical PhysicsScintillationTime projection chamber010308 nuclear & particles physicsbusiness.industryTime projection Chambers (TPC)FísicaDetectorsInstrumentation and Detectors (physics.ins-det)Gas detectorsScintillators scintillation and light emission processes (solid gas and liquid scintillators)Detectors de gasoschemistryParticle tracking detectors (Solid-state detectors)engineeringOptoelectronicsbusiness
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Development of Structured Scintillator Tiles for High-Granularity Calorimeters

2020

Calorimeters with a fine 3-D segmentation are considered to be a very promising technology for future high-energy physics experiments, since they provide in combination with particle flow algorithms excellent jet energy resolution and particle identification capabilities. Depending on the size, millions of individual channels consisting of a photosensor coupled to a scintillator tile have to be assembled. The usage of structured plastic scintillators with optically separated segments simplifies the mass production. We present the design, production, and performance of a 36 cm × 36 cm scintillator tile divided into 144 segments matching the geometry of the SiPM-based calorimeter frontend dev…

Materials sciencePhysics::Instrumentation and Detectorsbusiness.industryPhotodetectorScintillatorParticle identificationCalorimeterSilicon photomultiplierOpticsvisual_artvisual_art.visual_art_mediumElectronicsGranularityTilebusiness2020 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)
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Long axial crystals for PET applications: The AX-PET demonstrator and beyond

2013

The usage of long, axially oriented scintillator crystals in a PET scanner has been shown by the AX-PET Demonstrator as a possible solution for a high resolution and high sensitivity PET detector. In the AX-PET implementation, arrays of wavelength shifting (WLS) strips, placed orthogonally behind every crystal layer, are used to define the axial coordinate. After extensive characterization measurements, the AX-PET Demonstrator has been successfully used for the reconstruction of several phantoms and a few rodents. Possible extensions of the AX-PET concept towards Time Of Flight capabilities have been investigated, using Philips digital SiPMs as alternative photodetector. Promising CRT value…

Materials sciencebusiness.industryDetectorPhotodetectorSTRIPSIterative reconstructionScintillatorlaw.inventionTime of flightOpticslawbusinessAxial symmetryImage resolution2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)
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