Search results for "COUNTERS"

showing 10 items of 43 documents

A neutron spectrometer for studying giant resonances with (p, n) reactions in inverse kinematics

2014

A neutron spectrometer, the European Low-Energy Neutron Spectrometer (ELENS), has been constructed to study exotic nuclei in inverse-kinematics experiments. The spectrometer, which consists of plastic scintillator bars, can be operated in the neutron energy range of 100 keV to 10 MeV. The neutron energy is determined using the time-of-flight technique, while the position of the neutron detection is deduced from the time-difference information from photomultipliers attached to both ends of each bar. A novel wrapping method has been developed for the plastic scintillators. The array has a larger than 25% detection efficiency for neutrons of approximately 500 keV in kinetic energy and an angul…

Nuclear and High Energy PhysicsPhysics - Instrumentation and DetectorsELENSPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaNuclear TheoryFOS: Physical sciencesScintillator01 natural sciences7. Clean energyNeutron time-of-flight scatteringNuclear physicsDETECTOR ARRAYVM2000 wrappingSCINTILLATORS0103 physical sciencesNeutron detectionNeutronNeutron time-of-flight measurementsNuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentInstrumentationNuclear ExperimentLow-energy neutron spectrometerPhysicsBonner sphereSpectrometer010308 nuclear & particles physicsCOUNTERSInstrumentation and Detectors (physics.ins-det)Neutron temperature3. Good healthScintillation counterFísica nuclear
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Operation and first results of the NEXT-DEMO prototype using a silicon photomultiplier tracking array

2013

NEXT-DEMO is a high-pressure xenon gas TPC which acts as a technological test-bed and demonstrator for the NEXT-100 neutrinoless double beta decay experiment. In its current configuration the apparatus fully implements the NEXT-100 design concept. This is an asymmetric TPC, with an energy plane made of photomultipliers and a tracking plane made of silicon photomultipliers (SiPM) coated with TPB. The detector in this new configuration has been used to reconstruct the characteristic signature of electrons in dense gas, demonstrating the ability to identify the MIP and "blob" regions. Moreover, the SiPM tracking plane allows for the definition of a large fiducial region in which an excellent e…

PhotomultiplierMECANICA DE LOS MEDIOS CONTINUOS Y TEORIA DE ESTRUCTURASPhysics - Instrumentation and DetectorsPhysical measurementsParticle tracking detectors (Gaseous detectors)Time projection chambersPattern recognition SystemsFísica -- Mesuramentschemistry.chemical_elementFOS: Physical sciencesTracking (particle physics)01 natural sciences7. Clean energyTECNOLOGIA ELECTRONICAXenonSilicon photomultiplierOpticsCluster analysisDouble beta decayPattern recognition0103 physical sciencesCalibrationReconeixement de formes (Informàtica)Calibratge010306 general physicsInstrumentationImage resolutionMathematical PhysicsDetectors de radiacióPhysicsCalibration and fitting methods010308 nuclear & particles physicsbusiness.industryDetectorCluster findingFísicaInstrumentation and Detectors (physics.ins-det)Double-beta decay detectorsAnàlisi de conglomeratschemistryNuclear countersCalibrationbusiness
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Gravitational waves from galaxy encounters

2007

We discuss the emission of gravitational radiation produced in encounters of dark matter galactic halos. To this aim we perform a number of numerical simulations of typical galaxy mergers, computing the associated gravitational radiation waveforms as well as the energy released in the processes. Our simulations yield dimensionless gravitational wave amplitudes of the order of $10^{-13}$ and gravitational wave frequencies of the order of $10^{-16}$ Hz, when the galaxies are located at a distance of 10 Mpc. These values are of the same order as those arising in the gravitational radiation originated by strong variations of the gravitational field in the early Universe, and therefore, such gra…

PhysicsNuclear and High Energy PhysicsGravitational-wave observatoryGravitational waveInstituto de Ciencias del PatrimonioAstrophysics (astro-ph)Dark matterFOS: Physical sciencesAstronomyAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsGalaxy mergerAstrophysicsGravitational energyInstitute of Heritage SciencesGeneral Relativity and Quantum CosmologyGravitational fieldgalaxy encountersgravitational wavesIncipitGravitational collapseAstrophysics::Galaxy AstrophysicsGravitational redshift
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New information on β-delayed neutron emission from Be-12, Be-14

1999

17 pages, 3 tables, 5 figures, 1 appendix.-- PACS nrs.: 23.40.Hc; 27.20.+n.

PhysicsNuclear and High Energy PhysicsLarge Hadron ColliderRadioactivity: Be-12 Be-14 (from 1 GeV p on UC target selective mass separation)Astrophysics::High Energy Astrophysical PhenomenaConfidence intervalNuclear physics6 ≤ A ≤ 19 [[PACS] Properties of specific nuclei listed by mass ranges]Neutron long countersBe-12 Be-14 deduced P(n) values Be-14 deduced P(xn) valuesHigh Energy Physics::ExperimentNeutronMeasured βn nn time correlations[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19Nuclear ExperimentDelayed neutronRadioactive beam[PACS] Relation with nuclear matrix elements and nuclear structureBe-12 Be-14 (from 1 GeV p on UC target selective mass separation) [Radioactivity]
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Radon and material radiopurity assessment for the NEXT double beta decay experiment

2015

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM

Radon mitigationPhysics - Instrumentation and DetectorsNuclear engineeringchemistry.chemical_elementFOS: Physical sciencesRadon7. Clean energy01 natural sciencesHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)XenonCambres d'ionitzacióDouble beta decayGamma detectors (HPGe)0103 physical sciencesGamma spectroscopyNuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentDetectors de radiació010308 nuclear & particles physicsIonization chambersCanfranc Underground LaboratoryMaterial radiopurityFísicaTime-Projection Chamber (TPC)Instrumentation and Detectors (physics.ins-det)Double beta decaySemiconductor detectorchemistry13. Climate actionNuclear countersEnvironmental scienceNeutrino
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Ionization and scintillation response of high-pressure xenon gas to alpha particles

2013

High-pressure xenon gas is an attractive detection medium for a variety of applications in fundamental and applied physics. In this paper we study the ionization and scintillation detection properties of xenon gas at 10 bar pressure. For this purpose, we use a source of alpha particles in the NEXT-DEMO time projection chamber, the large scale prototype of the NEXT-100 neutrinoless double beta decay experiment, in three different drift electric field configurations. We measure the ionization electron drift velocity and longitudinal diffusion, and compare our results to expectations based on available electron scattering cross sections on pure xenon. In addition, two types of measurements add…

Scintillation (physics)IonizationMECANICA DE LOS MEDIOS CONTINUOS Y TEORIA DE ESTRUCTURASPhysics - Instrumentation and DetectorsMaterials scienceIonitzacióPhysics::Instrumentation and DetectorsFOS: Physical scienceschemistry.chemical_elementElectronCharge transportNuclear excitation01 natural sciences7. Clean energyHigh Energy Physics - ExperimentTECNOLOGIA ELECTRONICAHigh Energy Physics - Experiment (hep-ex)Gaseous detectorsXenonComptadors de centelleigIonization and excitation processesIonization0103 physical sciencesPhysics::Atomic and Molecular ClustersNuclear Experiment (nucl-ex)010306 general physicsInstrumentation and Methods for Astrophysics (astro-ph.IM)Nuclear ExperimentInstrumentationMathematical PhysicsHeliumDetectors de radiacióScintillationTime projection chamber010308 nuclear & particles physicsFísicaMultiplication and electroluminescence in rare gases and liquidsInstrumentation and Detectors (physics.ins-det)Alpha particleDouble-beta decay detectorschemistryNuclear countersScintillation counterExcitació nuclearAtomic physicsAstrophysics - Instrumentation and Methods for Astrophysics
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Carbon monoxide improves cardiac energetics and safeguards the heart during reperfusion after cardiopulmonary bypass in pigs

2004

Ischemia-reperfusion injury, a clinical problem during cardiac surgery, involves worsened adenosine trisphosphate (ATP) generation and damage to the heart. We studied carbon monoxide ( CO) pretreatment, proven valuable in rodents but not previously tested in large animals, for its effects on pig hearts subjected to cardiopulmonary bypass with cardioplegic arrest. Hearts of CO-treated pigs showed significantly higher ATP and phosphocreatine levels, less interstitial edema, and apoptosis of cardiomyocytes and required fewer defibrillations after bypass. We conclude that treatment with CO improves the energy status, prevents edema formation and apoptosis, and facilitates recovery in a clinical…

Sus scrofaMyocardial IschemiaApoptosisCardiotonic AgentsBiochemistrylaw.inventionchemistry.chemical_compoundAdenosine Triphosphateischemia reperfusion; heart arrest; apoptosis; hypoxia; Adenosine Diphosphate; Adenosine Monophosphate; Adenosine Triphosphate; Animals; Apoptosis; Carbon Monoxide; Cardiotonic Agents; Edema; Electric Countershock; Energy Metabolism; Female; Guanosine Triphosphate; Heart; Myocardial Ischemia; Myocardial Reperfusion Injury; Myocytes Cardiac; NAD; NADP; Oxidation-Reduction; Sus scrofa; Cardiopulmonary BypasslawEdemaEdemaMyocytes CardiacCarbon MonoxideCardiopulmonary BypassMED/04 - PATOLOGIA GENERALEHeartCardiac surgeryAdenosine DiphosphateAnesthesiaCardiologyFemaleGuanosine Triphosphatemedicine.symptomCardiacOxidation-ReductionBiotechnologymedicine.drugischemia reperfusion; heart arrest; apoptosis; hypoxiaAdenosine monophosphatemedicine.medical_specialtyCardiotonic AgentsElectric CountershockMyocardial Reperfusion InjuryPhosphocreatineInternal medicineGeneticsmedicineCardiopulmonary bypassischemia reperfusionAnimalsMolecular BiologyMyocytesbusiness.industryhypoxiaNADAdenosineapoptosiAdenosine MonophosphateAdenosine diphosphatechemistryEnergy MetabolismbusinessNADPheart arrest
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Narrativa dei Caraibi nel nuovo millennio

2020

L’etichetta “Letterature franco-caraibica” utilizzata, per convenzione, dalla critica per indicare unitariamente la produzione letteraria in lingua francese della regione centrale del Continente americano è assai impropria. La regione dei Caraibi abbraccia, infatti, sia alcune delle isole dell’arcipelago delle Piccole Antille (Martinica, Guadalupa), sia l’isola di Haïti, che fa parte delle Grandi Antille, che la Guiana incastonata sulla costa orientale dell’America meridionale. Pur nella diversità dei movimenti ideologici e degli avvenimenti storici che si sono succeduti nella regione, le opere letterarie degli scrittori caraibici francofoni, nel loro insieme, hanno oscillato, e continuano …

The definition "Franco-Caribbean Literature" used by convention from the critique to indicate all the literary production in French of the central region of the American continent is very improper. The Caribbean region includes in fact the islands of Martinique Guadeloupe Haïti and the Guiana. Despite the diversity of ideological movements and historical events that took place in these countries the literary works of the Caribbean writers have fluctuated and continue to oscillate between two tendencies: that of rooting in tradition and that of escape from it. The writers show themselves open to comparison and dialogue with other literary and cultural traditions in order to create a narrative form that corresponds to the many inheritances of those composite populations. Here the cultural syncretism that has been created allows to recognize a common identity in the name of all that the West wanted to extinguish. The common denominator seems to be inverted in the contradictory result of courageous but dangerous encounters of curiosities that can lead to conflicts to exclusions.
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Caraibi: un "archipel inachevé"

2018

L’etichetta “Letterature franco-caraibica” utilizzata, per convenzione, dalla critica per indicare unitariamente la produzione letteraria in lingua francese della regione centrale del Continente americano è assai impropria. La regione dei Caraibi abbraccia, infatti, sia alcune delle isole dell’arcipelago delle Piccole Antille (Martinica, Guadalupa), sia l’isola di Haïti, che fa parte delle Grandi Antille, che la Guiana incastonata sulla costa orientale dell’America meridionale. Pur nella diversità dei movimenti ideologici e degli avvenimenti storici che si sono succeduti nella regione, le opere letterarie degli scrittori caraibici francofoni, nel loro insieme, hanno oscillato, e continuano …

The definition "Franco-Caribbean Literature" used by convention from the critique to indicate all the literary production in French of the central region of the American continent is very improper. The Caribbean region includes in fact the islands of Martinique Guadeloupe Haïti and the Guiana. Despite the diversity of ideological movements and historical events that took place in these countries the literary works of the Caribbean writers have fluctuated and continue to oscillate between two tendencies: that of rooting in tradition and that of escape from it. The writers show themselves open to comparison and dialogue with other literary and cultural traditions in order to create a narrative form that corresponds to the many inheritances of those composite populations. Here the cultural syncretism that has been created allows to recognize a common identity in the name of all that the West wanted to extinguish. The common denominator seems to be inverted in the contradictory result of courageous but dangerous encounters of curiosities that can lead to conflicts to exclusions.Settore L-FIL-LET/14 - Critica Letteraria E Letterature Comparate
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Characterization of a neutron–beta counting system with beta-delayed neutron emitters

2016

A new detection system for the measurement of beta-delayed neutron emission probabilities has been characterized using fission products with well known β-delayed neutron emission properties. The setup consists of BELEN-20, a 4π neutron counter with twenty 3He proportional tubes arranged inside a large polyethylene neutron moderator, a thin Si detector for β counting and a selftriggering digital data acquisition system. The use of delayed-neutron precursors with different neutron emission windows allowed the study of the effect of energy dependency on neutron, β and β-neutron rates. The observed effect is well reproduced by Monte Carlo simulations. The impact of this dependency on the accura…

beta-delayed neutron emission probabilityAstrophysics::High Energy Astrophysical PhenomenaNuclear TheoryGeant4 simulationsself-triggered digital data acquisition systemNuclear Experimentneutron and beta counters
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