Search results for "Neutron time-of-flight scattering"

showing 6 items of 6 documents

Measurements of the 90,91,92,94,96 Zr n, gamma cross-sections at n_TOF

2005

Neutron capture cross sections of the 90,91,92,94,96Zr have been measured over the energy range from 1 eV to 1 MeV at the spallation neutron facility n TOF at CERN in 2003. The innovative features of the neutron beam, in particular the high instantaneous flux, the high energy resolution and low background, together with improvements of the neutron sensitivity of the capture detectors make this facility unique for neutron-induced reaction cross section measurements with much improved accuracy. The preliminary results of the Zr measurements show capture resonance strengths generally smaller than in previous measurements. Peer Reviewed

Nuclear and High Energy PhysicsNeutron cross sectionsPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaNuclear TheoryNeutron scattering[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]7. Clean energy01 natural sciencesNeutrons -- SeccionsNeutron time-of-flight scatteringNuclear physics0103 physical sciencesNeutron cross sectionNeutrons -- MesuramentNeutron010306 general physicsNuclear ExperimentPhysicsBonner sphere010308 nuclear & particles physicsNeutrons--MeasurementNeutron stimulated emission computed tomographyNeutron temperatureNeutron capture:Física::Astronomia i astrofísica [Àrees temàtiques de la UPC]Physics::Accelerator Physics
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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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A Ramsey apparatus for the measurement of the incoherent neutron scattering length of the deuteron

2008

Abstract A Ramsey apparatus for cold, polarised neutrons is described, which enables us to measure neutron precession angles with an absolute accuracy of about 1 ∘ . This is necessary to perform a planned high-accuracy measurement of the incoherent neutron scattering length b i , d of the deuteron. The performance of the apparatus is demonstrated in systematic stability measurements as well as in two selected examples using samples containing polarised nuclear spins.

PhysicsNuclear and High Energy PhysicsNuclear TheoryDynamic nuclear polarisationNeutron scatteringSmall-angle neutron scatteringInelastic neutron scatteringNeutron time-of-flight scatteringNeutron spin echoNuclear physicsQuasielastic neutron scatteringNeutronNuclear ExperimentInstrumentationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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Energy dependence of collective flow of neutrons and protons in197Au+197Au collisions

1994

We investigate the beam energy dependence of neutron and proton squeeze-out in collisions of197Au+197Au atE/A=400—800 MeV. The azimuthal anisotropy that describes the enhanced emission of mid-rapidity neutrons perpendicular to the reaction plane rises strongly with the transverse momentum of the neutrons. This dependence of the azimuthal anisotropy follows a universal curve — independent of beam energy — if the neutron momenta are measured in fractions of the projectile momentum per mass unit. Analogously, the kinetic energy spectra of mid-rapidity neutrons exhibit a universal behaviour as a function of the kinetic energy of the projectile.

PhysicsNuclear and High Energy PhysicsProtonProjectileAstrophysics::High Energy Astrophysical PhenomenaNuclear TheoryKinetic energyNeutron time-of-flight scatteringMomentumNuclear physicsNuclear fusionNeutronAtomic physicsNuclear ExperimentAnisotropyZeitschrift für Physik A Hadrons and Nuclei
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MONSTER: a TOF Spectrometer for beta-delayed Neutron Spectroscopy

2014

β-delayed neutron (DN) data, including emission probabilities, Pn, and energy spectrum, play an important role in our understanding of nuclear structure, nuclear astrophysics and nuclear technologies. A MOdular Neutron time-of-flight SpectromeTER (MONSTER) is being built for the measurement of the neutron energy spectra and branching ratios. The TOF spectrometer will consist of one hundred liquid scintillator cells covering a significant solid angle. The MONSTER design has been optimized by using Monte Carlo (MC) techniques. The response function of the MONSTER cell has been characterized with mono-energetic neutron beams and compared to dedicated MC simulations.

PhysicsNuclear and High Energy PhysicsSpectrometerta114Nuclear TheoryNeutron stimulated emission computed tomographyNeutron scatteringNeutron temperatureNeutron time-of-flight scatteringNeutron spectroscopyNuclear physicsNeutron cross sectionNeutronNuclear ExperimentNuclear Data Sheets
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Large solid-angle polarisation analysis at thermal neutron wavelengths using a 3He spin filter

2002

Abstract The strongly spin-dependent absorption of neutrons in nuclear spin-polarised 3 He opens up the possibility of polarising neutrons from reactors and spallation sources over the full kinematical range of cold, thermal and hot neutrons. In this paper we describe the first large solid-angle polarisation analysis measurement using a 3 He neutron spin filter at thermal neutron wavelengths ( λ =2.5 A). This experiment was performed on the two-axis diffractometer D1B at the Institut Laue-Langevin using a banana-shaped filter cell (530 cm 3 ) filled with 3 He gas with a polarisation of P =52% at a pressure of 2.7 bar. A comparison is made with a previous measurement on D7 using a cold neutr…

PhysicsNuclear and High Energy Physicsbusiness.industryNeutron scatteringNeutron radiationNeutron time-of-flight scatteringNeutron temperatureOpticsHelium-3Neutron cross sectionSpallationNeutronAtomic physicsNuclear ExperimentbusinessInstrumentationNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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