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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 17 of 17 for “"neutron energies"”.
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Fission fragment mass distributions and total kinetic energy release of 235-uranium and 238-uranium in neutron-induced fission at intermediate and fast neutron energies LA-UR-15-28829
… release with increasing incident neutron energy for fission of $^{235}$U and $^{238}$U. Although fission was discovered over seventy-five years ago, open questions remain about the physics of the fission process. The energy of the incident neutron, $E_n$, changes the division of …
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Neutron-deuteron elastic scattering and three-nucleon force
The differential cross section for neutron-deuteron elastic scattering was measured at six angles over the center-of-mass angular range 65⁰ - 1300⁰ and incident neutron energies 140 - 240 MeV at the LANSCE/WNR facility of the Los Alamos National Laboratory. Witala et al. (H. Witala et al. ), Phys. …
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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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Dimuon production by high energy neutrons
… Laboratory, the dimuon production by high energy neutrons has been measured for incident neutron energies of approximately 250 and 320 GeV. The mass spectra show clear peaks in the rho-omega mass region and at the J /psi mass. Cross sections and longitudinal and transverse momenta distributions …
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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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Nuclear Electromagnetic Currents in Chiral Effective Field Theory
… radiative capture cross sections at thermal neutron energies. The study shows that predictions obtained within this theoretical framework are in good agreement with the experimental data.</p>
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A time-of-flight spectrometer for fission fragment identification
… fission fragment distributions for incident neutron energies where no data currently exist. To accomplish these goals the Spectrometer for Ion Detection in Fission Research (SPIDER) project is intended to be a multi-armed, high-efficiency, high-resolution time-of-flight spectrometer for …
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An ionization chamber for fission fragment analysis
… fragment distributions is lacking at variable neutron energies as well as with sufficient uncertainty, and therefore better experimental data is desired. To achieve this goal, the Spectrometer for Ion Detection in Fission Research project (SPIDER) is being designed which uses high resolution …
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Determination of neutron energy spectra inside a water phantom irradiated by neutrons of energy up to ~ 64 Me V
A neutron spectrometer based on an NE230 deuterated organic liquid scintillator (25 mm diameter x 25 mm) has been developed for measuring neutron spectra in water. The spectrometer is capable of measuring neutron energies above 5 MeV, set by the electronic threshold. An important feature of the …
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Characterization of fissile material using low energy neutron interrogation
… in the exploration of various methods for active neutron interrogation, specifically for the presence of special nuclear material (SNM) in cargo containers. The proposed system aims to defeat the ability of terrorists to import SNM into the United States via maritime shipping, thus greatly …
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Capture cross sections of In¹¹⁵ and I¹²⁷ in the Kev region
… of the nucleus have increased the needs for neutron capture cross sections in the kev region. An indirect method to obtain these cross sections has been developed and applied to In¹¹⁵ and I¹²⁷ . Previous measurements of capture cross sections from a few kev to a few hundred kev and attempts …
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Theoretical performance analysis of a novel hemispherical tissue equivalent proportional counter for neutron monitoring and dosimetry
Neutron dosimetry in reactor fields is currently conducted using thermal neutron flux monitors. It has been demonstrated that Tissue Equivalent Proportional Counters (TEPCs) have the potential to improve the accuracy of neutron dosimetry in these reactor fields, and Multi-Element Tissue Equivalent …
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The Neutronic Design and Performance of the Indiana University Cyclotron Facility (IUCF) Low Energy Neutron Source (LENS)
Neutron scattering research is performed primarily at large-scale facilities. However, history has shown that smaller scale neutron scattering facilities can play a useful role in education and innovation while performing valuable materials research. This dissertation details the design and …
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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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Ionization Chamber Design, Development, and Testing for the UNM Fission Fragment Spectrometer
… and to expand on current data for other incident neutron energies. To attain the goal of new fission fragment data, the Spectrometer for Ion Detection in Fission Research (SPIDER) project is currently underway at Los Alamos National Labortory (LANL). The SPIDER project is intended to be a …
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The neutron sensitivities of Geiger-Müller counters
Neutron beams are always accompanied by gamma rays. Because neutrons and gamma rays have different biological effects, it is essential that the neutron and gamma dose components be determined when neutron beams are used for radiotherapy and radiobiology. Since gamma ray dosimeters almost always …
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Towards measuring the relative biological effectiveness of high-energy neutrons at iThemba LABS
In space, neutrons with energies of up to several TeV are produced through the interac-tions of primary cosmic radiation with matter such as in spacecraft shielding, and in the atmospheres and regoliths of moons and planets. The development of radiation health-risk models for space exploration …