0000000000240331

AUTHOR

C. J. Yoon

showing 5 related works from this author

Noise and radiation damage in silicon photomultipliers exposed to electromagnetic and hadronic radiation

2009

For the electron arm tracking system in the KAOS spectrometer at the Mainz Microtron MAMI a detector based on 2 m long scintillating fibres read out by silicon photomultipliers (SiPM) is planned. Because of the detector's close proximity to the intense electron beam a study of noise and radiation damage in SiPM has been performed. A sample of devices was exposed directly to a 14 MeV electron beam and to a mixed radiation field in the experimental area. First noticeable effects are a large increase in the dark count rate and a severe loss of the gain uniformity.

PhysicsNuclear and High Energy PhysicsPhotomultiplierPhysics::Instrumentation and Detectorsbusiness.industryRadiationParticle detectorOpticsSilicon photomultiplierElectron beam processingRadiation damageNuclear ExperimentbusinessInstrumentationMicrotronNoise (radio)Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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EXTRACTION OF ΛΛ SCATTERING LENGTH

2009

We determine ΛΛ scattering parameters from a ΛΛ invariant mass spectrum that was obtained by 12 C (K-, K+ΛΛ) reaction at the KEK Proton Synchrotron. In the framework of Watson's procedure, the obtained scattering length [Formula: see text] and effective range [Formula: see text] are most consistent with the values predicted by using the Nijmegen soft core models (NSC97's). However, the predicted values by using the Nijmegen hard-core ND ( G -matrix) and the extended soft-core (ESC00) models are out of two standard deviations from the determined scattering parameters.

PhysicsNuclear physicsNuclear and High Energy PhysicsRange (particle radiation)Soft coreExtraction (chemistry)Scattering parametersGeneral Physics and AstronomyProton SynchrotronInvariant massScattering lengthLambdaStandard deviationInternational Journal of Modern Physics E
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STATUS OF STRANGENESS ELECTRO-PRODUCTION AT MAMI

2009

At the Institut für Kernphysik in Mainz, Germany, the microtron MAMI has been upgraded to 1.5 GeV electron beam energy and can now be used to study strange hadronic systems. The magnetic spectrometer KAOS from GSI was dismantled and re-installed in the spectrometer facility operated by the A1 collaboration. The spectrometer's primary purpose is to study strangeness electro-production. Its compact design and its capability to detect negative and positive charged particles simultaneously under forward scattering angles complements the existing spectrometers. In 2008, an important milestone has been reached by the successful measurement of kaon production off a liquid hydrogen target. The ide…

magnetic spectrometer; particle detector design; kaon electro-production; hypernuclei electro-productionPhysicsNuclear and High Energy PhysicsParticle physicsSpectrometerPhysics::Instrumentation and DetectorsScatteringNuclear TheoryHadronDetectorGeneral Physics and AstronomyStrangenessCharged particleNuclear physicsPhysics::Accelerator PhysicsVacuum chamberNuclear ExperimentMicrotronStrangeness in Nuclear and Hadronic Systems
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Hypernuclear production cross section in the reaction of 6Li + 12C at 2 A GeV

2015

WOS: 000358624800021

Particle physicsNuclear and High Energy PhysicsPopulationH-4(LAMBDA)BEAMLIFETIMEStrangenessHEAVY-ION COLLISIONSLambdaParticle identificationNuclear physicsHypernucleiInvariant massRapidityeducationNuclear ExperimentPhysicseducation.field_of_studyHeavy ion collisionHyperonRelativistic energyHypernucleuslcsh:QC1-999STATEProduction cross sectionQUANTUM MOLECULAR-DYNAMICSLIGHT HYPERNUCLEIYield ratioDECAYlcsh:PhysicsRELATIVISTIC HYPERNUCLEIPhysics Letters B
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Measurement of the Neutron Electric to Magnetic Form Factor Ratio atQ2=1.58  GeV2Using the ReactionHe→3(e→,e′n)pp

2013

A measurement of beam helicity asymmetries in the reaction $^{3}\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}n)pp$ is performed at the Mainz Microtron in quasielastic kinematics to determine the electric to magnetic form factor ratio of the neutron ${G}_{E}^{n}/{G}_{M}^{n}$ at a four-momentum transfer ${Q}^{2}=1.58\text{ }\text{ }{\mathrm{GeV}}^{2}$. Longitudinally polarized electrons are scattered on a highly polarized $^{3}\mathrm{He}$ gas target. The scattered electrons are detected with a high-resolution magnetic spectrometer, and the ejected neutrons are detected with a dedicated neutron detector composed of scintillator ba…

PhysicsSystematic error010308 nuclear & particles physicsGeneral Physics and AstronomyElectron01 natural sciencesHelicityPolarized target0103 physical sciencesMagnetic form factorHigh Energy Physics::ExperimentNeutronAtomic physicsNuclear Experiment010306 general physicsPhysical Review Letters
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