Search results for "neutron sources"

showing 2 items of 2 documents

A search for point sources of EeV neutrons

2012

A thorough search of the sky exposed at the Pierre Auger Cosmic Ray Observatory reveals no statistically significant excess of events in any small solid angle that would be indicative of a flux of neutral particles from a discrete source. The search covers from −90◦ to +15◦ in declination using four different energy ranges above 1 EeV (1018 eV). The method used in this search is more sensitive to neutrons than to photons. The upper limit on a neutron flux is derived for a dense grid of directions for each of the four energy ranges. These results constrain scenarios for the production of ultrahigh energy cosmic rays in the Galaxy.

AstronomyEnergy fluxAstrophysics01 natural sciences7. Clean energyNeutron fluxObservatorycosmic rays – Galaxy: disk – methods: data analysisNeutron detection010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physics[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Gamma rayAstrophysics::Instrumentation and Methods for AstrophysicsASTRONOMYPierre Auger ObservatoryCOSMIC-RAYSRadiación cósmicaUltra High Energy Cosmic RayComputingMethodologies_DOCUMENTANDTEXTPROCESSINGMASSIVE BLACK-HOLEFísica nuclearPierre Auger Observatory high-energy neutron sources neutron flux limitAstrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesCosmic rayGalaxiaGalaxy: diskcosmic rays0103 physical scienceshigh-energy neutron sourcesNeutronCosmic-ray observatoryCiencias ExactasANISOTROPY010308 nuclear & particles physicsGAMMA-RAYSAnálisis de datosAstronomyFísicaAstronomy and AstrophysicsASTROFÍSICAneutron flux limitmethods: data analysisNÊUTRONSSpace and Planetary ScienceUltra High Energy Cosmic RaysExperimental High Energy Physics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]GALACTIC-CENTER
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A neutron source for IGISOL-JYFLTRAP : Design and characterisation

2017

A white neutron source based on the Be(p, nx) reaction for fission studies at the IGISOL-JYFLTRAP facility has been designed and tested. 30MeV protons impinge on a 5mm thick water-cooled beryllium disc. The source was designed to produce at least 1012 fast neutrons/s on a secondary fission target, in order to reach competitive production rates of fission products far from the valley of stability. The Monte Carlo codes MCNPX and FLUKA were used in the design phase to simulate the neutron energy spectra. Two experiments to characterise the neutron field were performed: the first was carried out at The Svedberg Laboratory in Uppsala (SE), using an Extended-Range Bonner Sphere Spectrometer and …

Bonner spherePhysicsNuclear and High Energy Physics010308 nuclear & particles physicsFissionHadronNuclear Theorychemistry.chemical_element01 natural sciencesNuclear physicsSubatomär fysikchemistry0103 physical sciencesSubatomic PhysicsPhysics::Accelerator PhysicsNeutron sourceNuclear fusionneutron sourcesPhysics::Atomic PhysicsBeryllium010306 general physicsNuclear Experiment
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