Global ETD Search
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 228 for “"Physics, Nuclear"”.
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The Determination of the Thermal Neutron Flux in a Research Reactor
… not only for purposes of experimental reactor physics (e.g., determination of specific data with regard to a new reactor), and for reactor operation (e.g., determination of reactor power level) but also for numerous radiation experiments in solid state physics, nuclear physics and radiation …
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Design and characterization of a strong positron source at the MSTR beam port
… found uses in diverse fields including medical physics, nuclear physics, biology, surface science, exotic atom research and space science. The purpose of this work is to design and optimize a reactor-based positron source at the Missouri University of Science and Technology Reactor (MSTR) beam …
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The Extinction Probabilities of Nuclear Assemblies: A Sensitivity Study
… the extinction probabilities of certain types of nuclear assemblies. A broadly defined class of mathematical analysis techniques known as sensitivity analysis (and in particular, a theoretical construct known as the Gâteaux-variation) will be employed to calculate these effects. The analysis …
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Effect of Titanium Nitride Surface Layers on Deuterium Absorption and on Sub-Surface Concentration Profiles in Titanium
A three-region nitrogen concentration near-surface profile is obtained. The first region spans from 100 to 1000 A depending on the gas exposure time, and contains about 33 at. % (Ti2N). The second region contains solid solution of nitrogen in close packed hexagonal (cph) titanium TiN x, with x …
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Experimental Study of Proton Rate Density in a Spherical Inertial Electrostatic Confinement Fusion Device
Also, during the progress of this dissertation, two valuable SIEC derivatives--an SIEC wavelength tunable x-ray source (SIEC-TX) and an IEC linear neutron source device (C-device)--have been developed. The SIEC-TX generates x-rays by electron-electron interactions at relativistic velocity at the …
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Proton -Deuteron Elastic Scattering and Three -Nucleon Forces
The spin observables Ay, iT 11, and Cy,y in proton-deuteron elastic scattering were measured over the angular range 65° < theta cm < 115° at a proton energy Tlab = 197 MeV. These data were acquired with a polarized proton beam and an internal vector-polarized deuteron gas target at the …
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Primordial Nucleosynthesis in the New Age of Cosmology: Determining Uncertainties, Examining Concordance, and Probing New Physics
… are dominated by systematic errors in nuclear cross sections. We critically analyze the cross section data, producing representations that describe this data and its uncertainties. We take into account the correlations among data, and explicitly treat the systematic errors between data …
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A Measurement of the Anomalous Magnetic Moment of the Negative Muon to 0.7 Ppm
… 2.7sigma level. This difference is suggestive of physics beyond the standard model, although not conclusive. The magnitude of the difference is compatible with certain supersymmetric models and can be use to set constraints on many exotic physics models including muon substructure, permanent …
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Measurements of Compton Scattering on the Proton at 2--6 GeV
"Similar to elastic electron scattering, Compton scattering on the proton at high momentum transfers (and high p⊥) can be an effective method to study its short-distance structure. An experiment has been carried out to measure the cross sections for Real Compton Scattering (RCS) on the proton for …
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Measurement of the Strange Quark Contribution to Proton Structure Through Parity Violating Electron -Proton Scattering
At intermediate Q2 of about 0.23 ( GeV/c)2, a consistent value of is seen compared to previous experiments; together with a measurement that may imply a negative value of GsE . For Q2 above 0.5 (GeV/c) 2 a consistently positive value for the linear combination of the strange form factors is seen.
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Measurement of the Transverse Spin Polarization of the Lambda in Quasi-Real Photoproduction and Electroproduction at HERMES
The mystery of hadron polarization has been a source of both experimental and theoretical interest the last few decades. Measurements of polarizations in such particles as the Lambda particle have been done in proton-proton collisions, but studies in positron-proton scattering with high statistical …
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Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling
The MuCap experiment, the data analysis leading to the result for Lambda S, and contextual information are described in this dissertation. In the first chapter, a brief historical review of previous measurements of muon capture on the proton introduces many of the experimental challenges. The next …
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Polarization, Motion, and Fragmentation: Exploring the Role of Quarks in the Nucleon Through Semi-Inclusive Longitudinal Spin Asymmetries at HERMES
This dissertation presents an analysis of deep inelastic scattering data, with polarized electron beam and polarized hydrogen and deuterium gas targets, taken by the HERMES collaboration at the DESY laboratory in Hamburg, Germany. Double-spin Born asymmetries are presented. Semi-inclusive …
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Relativistic Hamiltonians and Short-Range Structure of Nuclei
This work is divided into two parts. In the first part, short-range structure of deuteron is studied using a nonrelativistic Hamiltonian. The equidensity surfaces for spin projection $M\sb{s}$ = 0 distributions are found to be toroidal in shape, while those of $M\sb{s}$ = $\pm$1 have dumbbell …
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A Scan of the Cross Section of the Reaction (Antiproton + Proton Going to Antilambda + Sigma-0 and Charge Conjugate) From Threshold to 2.5 MeV Excess Energy
The total cross section of the reaction pp→LS0+c. c. at ten momentum values within 2.5 MeV of threshold was measured using the Low Energy Antiproton Ring (LEAR) at CERN. The cross section was normalized against the similar reaction pp→LL and a novel background estimation using …
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A Measurement of the Proton Weak Magnetic Form Factor (G(m)(z)) at Q(2)=0.1 GeV(2)/c(2)
… transfer of Q2 = 0.1 GeV2/c2). A measured physics asymmetry of Aphys=- 5.22+/-2.24+/-0.62 x10-6 corresponds to a measured weak magnetic form factor of GZMQ2=0.1G eV2/c2=0.298+/- 0.156+/-0.044+/-0.024 mN. The first uncertainty is statistical, the second is systematic contributions from the …
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High Energy Two -Body Deuteron Photodisintegration
… chromodynamics (QCD) and traditional hadronic nuclear physics.
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A Study of Polarized Lambda Production in Deep Inelastic Positron Scattering
Many measurements are necessary to answer these questions. As a first step, Lambda particles are generated at the HERMES experiment in Hamburg, Germany, using a polarized positron beam and an unpolarized target. The polarization which is transferred to these final state Lambda's depends not only on …
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