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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Neutron Detector"”.
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Novel Neutron Detector for n-n Scattering Length Measurement
The neutron-neutron (n-n) scattering length is a fundamental parameter in nuclear physics; however, measurements are plagued with large uncertainties caused by neutron detector cross talk. Many experimentalists also rely upon computer code to calibrate their neutron detectors. Experiments give one …
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An Improved Flexible Neutron Detector For Powder Diffraction Experiments
… of the next generation of spallation sources for neutron scattering. Neutron powder diffraction instruments will be an important element of these facilities and the incorporation of detectors into these instruments with a high neutron capture efficiency is desirable. A new detector design named …
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Methods for optimization of neutron detector performance in nuclear power plants
… is based on measurements from in-core flux detectors. Thus, this thesis proposes a methodology for managing neutron-detector aging. Detector performance improvement for prompt fraction along with genetic algorithm optimization, risk estimation, and the fault semantic network (FSN) are …
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Simulation of dynamic response of Self-Powered-Inconel-Neutron-Detector lead cables using a semi-empirical model
… response of lead cables of Inconel self-powered neutron detectors in a CANDUpower reactor. The main goal was to develop a semi-empirical dynamic model of theInconel lead-cables in Ontario Power Generation’s Darlington Nuclear GenerationStation (NGS) able to simulate the lead cables’ response to …
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PREDICTING THE SENSITIVITY OF A BERYLLIUM/SCINTILLATOR FUSION NEUTRON DETECTOR COMBINING EXPERIMENTAL METHODS AND MONTE CARLO MODELS
… sensitivity of a beryllium/scintillator fusion neutron detector. Neutrons may be captured by the beryllium via the 9Be (n, α) 6He nuclear reaction, where the product nucleus, 6He, decays by beta emission. The beta particles can be detected by close coupling scintillator with the beryllium. The …
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Investigation of the Photoneutron Cross Section in Lead-206 and Lead-208 From 9 to 16 Mev (Photon, Statistical, Decay, Giant Resonance)
The time of flight of photoneutrons from ('206)Pb and ('208)Pb was observed at scattering angles of 55(DEGREES), 90(DEGREES), and 125(DEGREES). Photons with energies between 9 and 16 MeV were used to excite the target nuclei. The incident photon beam was provided by the University of Illinois …
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Synthesis and characterization of lanthanide fluorides for forensic neutron detection
… eventually be used as a forensic and clandestine neutron detector material. There is a need for neutron detectors that have no sensitivity to any other type of radiation and can be used as a forensic tool to go back and look at an event. There is the further requirement that such detectors be hard …
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Simulation of muon-catalysed fusion experiments
… density gas target by detecting collinear alpha-neutron coincidences and relying on the differing stopping powers of the α and αμ ions. The Monte Carlo simulations provide estimates of geometrical and detection efficiency factors required for the calculation of the sticking coefficient from the …
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Fast neutron resonance radiography for element imaging : theory and applications
Fast Neutron Resonance Radiography (NRR) has been devised as an elemental imaging method, with immediate applications to detecting explosives and drugs in passenger suitcases. In the NRR method, the 2-D elemental mapping of hydrogen, carbon, nitrogen, oxygen and the sum of other elements are …
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Imaging the ionization track of alpha recoils for the directional detection of weapons grade plutonium
… construction of a prototype, directional, fast neutron detector, modeled after the Dark Matter Time Projection Chamber. Fast neutrons are emitted by a host of interesting sources, including medical isotopes, research sources, cosmic neutron spallation, and the most interesting, SNM and WGP. This …
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Epitaxial growth and characterization of hexagonal boron nitride for deep UV applications
… device applications. Additionally, the high neutron capture cross-section of the isotope boron-10 makes hBN a unique material for neutron detector applications. Its similar in-plane lattice constant to graphene and chemical inertness and resistance to oxidation makes hBN an ideal material for …
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DIRECTED AND ELLIPTIC FLOW MEASUREMENTS: A COMPARISON BETWEEN THE PARTICIPANT AND SPECTATOR PLANES IN Pb+Pb COLLISIONS AT √sNN = 5.02 TeV WITH CMS AT THE LHC
… is approximated using participants and spectator neutrons measured with the Compact Muon Solenoid (CMS) detector and the newly installed Spectator Reaction Plane Detector (SRPD), respectively. The SRPD is the latest addition to the existing Zero Degree Calorimeter (ZDC) designed to measure …
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The three-body photodisintegration of helium-3
… onset of the quasideuteron effect in 3He. If a neutron and a proton in a nucleus are interacting and absorb an incident photon, they can break up in a marrer kinematically similar to a deuteron, hence the name quasideuteron This effect had previously been seen in 3He above 75 MeV photon energy. …
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Investigation of the photoneutron cross section in 206Pb and 208 Pb from 9 to 16 MeV
The time of flight of photoneutrons from 206Pb and 208Pb was observed at scattering angles of 55 0 90 0 , and 125 o. Photons with energies between 9 and 16 MeV were used to excite the target nuclei. The incident photon beam was provided by the University of Illinois Tagged Photon Facility and had …
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Coincident neutron/proton pairs from 6̳Li photodisintegration with 40-100 MeV photons
… to photodisintegrate 6Li nuclei, and emitted neutron/proton pairs were observed in coincidence. Measurement of the energies and angles of the emitted pair allowed reconstruction of the photon energy, as well as the recoil angle and energy of the residual 4He nucleus. Cross sections for the …
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Steady and Transient Analysis of Flow and Heat Transfer in SPND Assembly
… and heat transfer for the SPND (Self-Powered Neutron Detector) system used within the nuclear reactor core in the U.S. Evolutionary Power Reactor developed by AREVA. The SPND system is composed of six individual detectors which are used for in-core measurement of thermal neutron flux. The …
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Construction and Testing of a Portable Time Projection Chamber for Fast Neutron Detection
… monitoring is the need for improved radiation detectors. Gamma ray detectors experienced a boom in development over the last half century, but neutron detectors have met a higher level of resistance. When monitoring for the potential proliferation of irradiated nuclear fuel, the fast neutron …
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Neutron Resonance Transmission Analysis of Nuclear Material Using a Portable D-T Neutron Generator
… capacity to analyze thick or shielded targets. Neutron Resonance Transmission Analysis (NRTA) is an active neutron interrogation technique that addresses these challenges by offer- ing isotope-specificity, applicability to a wide range of mid- and high-Z isotopes, and the ability to assay …
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Amorphous hydrogenated boron carbide for solid-state direct-conversion thermal neutron detection
… (a-BC:H) is one of a very limited number of neutron-sensitive materials. It has been studied over the last three decades for solid-state thermal neutron detection due to its high resistivity, moderate bandgap, high neutron absorption cross-section, and high stability under harsh physical and …
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Interfacial Transport Phenomena of the Non-Wetting Phase in Porous Media: Applied to Polymer Electrolyte Fuel Cell Gas Diffusion Media
… physical assumptions. </p> <p>High resolution neutron radiography is used to measure the liquid content profile across the diffusion media, and the results are compared with the model predictions. When the instrumental broadening attributed to the limited resolution of the measurement is …
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