subject:(neutron)

Oregon State University

1. Boulton, Nicholas M. Commissioning of the NDDL-40 Neutron Detection System at Oregon State University.

Degree: MS, Radiation Health Physics, 2017, Oregon State University

URL: http://hdl.handle.net/1957/60583

► The Neutron radiography facility (NRF) at Oregon State University (OSU) has been modified to begin working on the non-destructive evaluation of concrete materials to study… (more)

Subjects/Keywords: neutron; Neutron radiography – Oregon – Corvallis

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APA (6^th Edition):

Boulton, N. M. (2017). Commissioning of the NDDL-40 Neutron Detection System at Oregon State University. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/60583

Chicago Manual of Style (16^th Edition):

Boulton, Nicholas M. “Commissioning of the NDDL-40 Neutron Detection System at Oregon State University.” 2017. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/60583.

MLA Handbook (7^th Edition):

Boulton, Nicholas M. “Commissioning of the NDDL-40 Neutron Detection System at Oregon State University.” 2017. Web. 27 Feb 2021.

Vancouver:

Boulton NM. Commissioning of the NDDL-40 Neutron Detection System at Oregon State University. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/60583.

Council of Science Editors:

Boulton NM. Commissioning of the NDDL-40 Neutron Detection System at Oregon State University. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/60583

Tulane University

2. Haun, Robert. Precision measurement of the coherent scattering length of gaseous helium-four using neutron interferometry.

Degree: 2019, Tulane University

URL: https://digitallibrary.tulane.edu/islandora/object/tulane:94534

►

[email protected]

This dissertation details a measurement of the n-⁴He coherent scattering length to be b_4{He} = [3.0982 ±\: 0.00214; ({stat}) ±\: 0.00077; ({sys})] fm utilizing… (more)

▼

[email protected]

This dissertation details a measurement of the n-⁴He coherent scattering length to be b_4{He} = [3.0982 ±\: 0.00214; ({stat}) ±\: 0.00077; ({sys})] fm utilizing a perfect silicon crystal neutron interferometer. This measurement provides over a factor of 10 improvement in precision and differs by 0.162 fm compared to the most commonly used value. Neutron interferometry provides a tool for precision scattering lengths measurements for a variety of isotopes. Examples include coherent scattering length measurements for ¹H, ²H, ³He and the incoherent scattering length of ³He. Neutron scattering lengths of light nuclei provide useful tests of nuclear potential models and serve as inputs for nuclear effective field theories. A monolithic, perfect silicon neutron interferometer splits the wave function of a single neutron via Bragg diffraction into two coherent paths spatially separated to the extent of a few centimeters. A sample of ⁴He gas, contained within an aluminum cell, is introduced into one beam path which produces a phase shift directly proportional to b_4{He}. Significant effort has been spent quantifying important systematic considerations that include thermal transfer from the gas cell to the interferometer crystal and deformation of the gas cell walls due to gas pressure which ranges from 7 bar to 13 bar which were calculated by an FEA simulation. Thermal transfer between the gas cell and interferometer crystal induces a change of the intrinsic interferometer phase which is dependent on sample position. This additional systematic phase has been named the shadow phase. A glycol cooling system was used to mitigate the shadow phase and a special measurement pattern was devised to account for possible shadow phase drift. This work was performed at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR).

1

Robert Haun

Advisors/Committee Members: Wietfeldt, Fred (Thesis advisor), School of Science & Engineering Physics and Engineering Physics (Degree granting institution).

Subjects/Keywords: Neutron Optics

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APA (6^th Edition):

Haun, R. (2019). Precision measurement of the coherent scattering length of gaseous helium-four using neutron interferometry. (Thesis). Tulane University. Retrieved from https://digitallibrary.tulane.edu/islandora/object/tulane:94534

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Haun, Robert. “Precision measurement of the coherent scattering length of gaseous helium-four using neutron interferometry.” 2019. Thesis, Tulane University. Accessed February 27, 2021. https://digitallibrary.tulane.edu/islandora/object/tulane:94534.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Haun, Robert. “Precision measurement of the coherent scattering length of gaseous helium-four using neutron interferometry.” 2019. Web. 27 Feb 2021.

Vancouver:

Haun R. Precision measurement of the coherent scattering length of gaseous helium-four using neutron interferometry. [Internet] [Thesis]. Tulane University; 2019. [cited 2021 Feb 27]. Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:94534.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Haun R. Precision measurement of the coherent scattering length of gaseous helium-four using neutron interferometry. [Thesis]. Tulane University; 2019. Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:94534

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Wang, Xi. 3D Neutron Diffraction Studies on the Vortex Lattice.

Degree: PhD, Physics, 2012, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:297705/

► In condensed matter physics the vortex lattice of type-II superconductors provides a prototype for studying the effect of random pinning on elastic systems. One important… (more)

▼ In condensed matter physics the vortex lattice of type-II superconductors provides a prototype for studying the effect of random pinning on elastic systems. One important problem is to understand the structural transition from a theoretically predicted ordered Bragg glass phase to a disordered vortex liquid phase. Defects, such as screw dislocations, should play an important role in mediating this order-disorder transition. It is important to confirm the existence of these defect structures in the vortex lattice. Experimentally it is difficult to probe the detailed defect structures inside the vortex lattice. Traditional methods can only provide information on the surface configuration or an averaged picture of the bulk behavior of the vortex lattice. Here we use a novel high-resolution neutron diffraction technique to probe the angular orientation of the lattice planes as the flux lines traverse the atomic crystal. Our results provide structural evidence for screw dislocations inside the vortex lattice. The anisotropic defect structure in the underlying atomic lattice serves as a symmetry breaking field for the vortex lattice. The strong dependence of the vortex lattice structure on the growth procedure reveals that the system is metastable and can be perturbed through thermal cycling to a possible ground state. We measure the structure of the vortex lattice under different applied magnetic fields and temperatures to study the interplay between vortex-vortex interaction, vortex-atomic lattice interaction, and thermal fluctuations. This high-resolution neutron diffraction technique opens up a new way in studying the detailed structure of the vortex lattice. Our results suggest that the vortex lattice in low temperature superconductors with anisotropic defects in the atomic lattice could be an excellent candidate for exploring the entangled flux liquid phase. Advisors/Committee Members: Ling, Xinsheng (Director), Kosterlitz, J. (Reader), Mitrovic, Vesna (Reader).

Subjects/Keywords: neutron diffraction

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APA (6^th Edition):

Wang, X. (2012). 3D Neutron Diffraction Studies on the Vortex Lattice. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:297705/

Chicago Manual of Style (16^th Edition):

Wang, Xi. “3D Neutron Diffraction Studies on the Vortex Lattice.” 2012. Doctoral Dissertation, Brown University. Accessed February 27, 2021. https://repository.library.brown.edu/studio/item/bdr:297705/.

MLA Handbook (7^th Edition):

Wang, Xi. “3D Neutron Diffraction Studies on the Vortex Lattice.” 2012. Web. 27 Feb 2021.

Vancouver:

Wang X. 3D Neutron Diffraction Studies on the Vortex Lattice. [Internet] [Doctoral dissertation]. Brown University; 2012. [cited 2021 Feb 27]. Available from: https://repository.library.brown.edu/studio/item/bdr:297705/.

Council of Science Editors:

Wang X. 3D Neutron Diffraction Studies on the Vortex Lattice. [Doctoral Dissertation]. Brown University; 2012. Available from: https://repository.library.brown.edu/studio/item/bdr:297705/

Addis Ababa University

4. Atakalti Belay, Belay. TEMPERATURE DEPENDENCE VISCOSITY OF THE NEUTRON STAR MATTER .

Degree: 2012, Addis Ababa University

URL: http://etd.aau.edu.et/dspace/handle/123456789/1422

► In this work, we review the basics of both ideal and non ideal uid dynamics. Funda- mental principles of uid dynamics,solution of nonlinear Boltzmann equation,… (more)

Subjects/Keywords: VISCOSITY; NEUTRON

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APA (6^th Edition):

Atakalti Belay, B. (2012). TEMPERATURE DEPENDENCE VISCOSITY OF THE NEUTRON STAR MATTER . (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/1422

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Atakalti Belay, Belay. “TEMPERATURE DEPENDENCE VISCOSITY OF THE NEUTRON STAR MATTER .” 2012. Thesis, Addis Ababa University. Accessed February 27, 2021. http://etd.aau.edu.et/dspace/handle/123456789/1422.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Atakalti Belay, Belay. “TEMPERATURE DEPENDENCE VISCOSITY OF THE NEUTRON STAR MATTER .” 2012. Web. 27 Feb 2021.

Vancouver:

Atakalti Belay B. TEMPERATURE DEPENDENCE VISCOSITY OF THE NEUTRON STAR MATTER . [Internet] [Thesis]. Addis Ababa University; 2012. [cited 2021 Feb 27]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1422.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Atakalti Belay B. TEMPERATURE DEPENDENCE VISCOSITY OF THE NEUTRON STAR MATTER . [Thesis]. Addis Ababa University; 2012. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1422

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

5. Hon, Ryan Paul. Development of methods and tools for on-the-fly response function generation for criticality calculations.

Degree: PhD, Mechanical Engineering, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/58184

► Stochastic Particle Response Calculator, SPaRC, is a new stochastic neutron transport code that has been developed and optimized for the computation of response functions for… (more)

▼ Stochastic Particle Response Calculator, SPaRC, is a new stochastic neutron transport code that has been developed and optimized for the computation of response functions for use in response matrix based whole-core transport solvers. SPaRC transports neutrons from a specified fixed source distribution and computes responses as neutrons stream through and then exit regions of interest. The code makes use of both multi-group and continuous energy nuclear data and takes advantage of parallel computing through the message passing interface (MPI). In order to test the neutron transport routine, various small benchmark problems were solved with SPaRC and compared to results generated with MCNP. Results show excellent agreement between the solutions generated by these codes for both multi-group and continuous energy calculations. The responses generated by SPaRC have been tailored for use in the coarse mesh transport (COMET) method. COMET is a hybrid stochastic/deterministic method shown to compute fast and accurate solutions for a variety of nuclear systems. In order to obtain these solutions, COMET makes use of pre-computed response functions aggregated into a library for use in a deterministic iteration scheme. Previously these response functions were calculated with MCNP and took place before a transport calculation. SPaRC also generates these response functions for use with the COMET method, with the added capability of performing these calculations during the transport routine as needed. This on-the-fly capability for response generation enables the use of the COMET method for calculations where the state of a problem changes with time. SPaRC’s ability to generate responses during a calculation eliminates the need for a fully pre-computed response library to cover the entire possible solution space, extending the capability of COMET to neutronics problems involving multi-physics feedback, such as thermal-hydraulic and depletion calculations. Sample calculations on the reactor assembly level were performed in order to test the accuracy of the SPaRC generated response functions. First, responses were generated for uncontrolled, controlled, and gadded assemblies with both MCNP and SPaRC. Next, COMET calculations were performed using these two sets of responses for the different assembly types in order to generate eigenvalues and pin fission density distributions. The results generated from the MCNP and SPaRC responses agreed within 0.05% for the core eigenvalue and within 0.002% for pin powers. SPaRC is a newly developed fixed-source radiation transport code. The neutron transport method has been benchmarked against the stochastic transport code MCNP with good agreement and new database management and creation routines have been developed to aid response generation. SPaRC introduces a response function flexibility to the COMET method that facilitates thermal hydraulic and depletion calculations. Advisors/Committee Members: Rahnema, Farzad (advisor), Petrovic, Bojan (committee member), Zhang, Dingkang (committee member), Chow, Edmond (committee member), Haghighat, Alireza (committee member), Leal, Luiz (committee member).

Subjects/Keywords: Neutron transport

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APA (6^th Edition):

Hon, R. P. (2016). Development of methods and tools for on-the-fly response function generation for criticality calculations. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58184

Chicago Manual of Style (16^th Edition):

Hon, Ryan Paul. “Development of methods and tools for on-the-fly response function generation for criticality calculations.” 2016. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021. http://hdl.handle.net/1853/58184.

MLA Handbook (7^th Edition):

Hon, Ryan Paul. “Development of methods and tools for on-the-fly response function generation for criticality calculations.” 2016. Web. 27 Feb 2021.

Vancouver:

Hon RP. Development of methods and tools for on-the-fly response function generation for criticality calculations. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1853/58184.

Council of Science Editors:

Hon RP. Development of methods and tools for on-the-fly response function generation for criticality calculations. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58184

Colorado School of Mines

6. Craft, Aaron E. Design, construction, and demonstration of a neutron beamline and a neutron imaging facility at a Mark-I TRIGA reactor.

Degree: PhD, Metallurgical and Materials Engineering, 2013, Colorado School of Mines

URL: http://hdl.handle.net/11124/78115

► The fleet of research and training reactors is aging, and no new research reactors are planned in the United States. Thus, there is a need… (more)

▼ The fleet of research and training reactors is aging, and no new research reactors are planned in the United States. Thus, there is a need to expand the capabilities of existing reactors to meet users' needs. While many research reactors have beam port facilities, the original design of the United States Geological Survey TRIGA Reactor (GSTR) did not include beam ports. The MInes NEutron Radiography (MINER) facility developed by this thesis and installed at the GSTR provides new capabilities for both researchers and students at the Colorado School of Mines. The facility consists of a number of components, including a neutron beamline and beamstop, an optical table, an experimental enclosure and associated interlocks, a computer control system, a multi-channel plate imaging detector, and the associated electronics. The neutron beam source location, determined through Monte Carlo modeling, provides the best mixture of high neutron flux, high thermal neutron content, and low gamma radiation content. A Monte Carlo n-Particle (MCNP) model of the neutron beam provides researchers with a tool for designing experiments before placing objects in the neutron beam. Experimental multi-foil activation results, compared to calculated multi-foil activation results, verify the model. The MCNP model predicts a neutron beamline flux of 2.2*10[to the sixth power] ± 6.4*10[to the fifth power] n/cm[to the second power]-s based on a source particle rate determined from the foil activation experiments when the reactor is operating at a power of 950 kWt with the beam shutter fully open. The average cadmium ratio of the beamline is 7.4, and the L/D of the neutron beam is approximately 200±10. Radiographs of a sensitivity indicator taken using both the digital detector and the transfer foil method provide one demonstration of the radiographic capabilities of the new facility. Calibration fuel pins manufactured using copper and stainless steel surrogate fuel pellets provide additional specimens for demonstration of the new facility and offer a comparison between digital and film radiography at the new facility. Comparison of the radiographs taken by the two methods reveals that the digital detector does not produce high quality images when compared to film radiography. Advisors/Committee Members: King, Jeffrey C. (advisor), Gorman, Brian P. (committee member), Findley, Kip Owen (committee member), Ahrens, Cory (committee member), Howe, Steven D. (committee member).

Subjects/Keywords: neutron radiography; neutron beam; Neutron beams; Neutron radiography; TRIGA reactors

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APA (6^th Edition):

Craft, A. E. (2013). Design, construction, and demonstration of a neutron beamline and a neutron imaging facility at a Mark-I TRIGA reactor. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/78115

Chicago Manual of Style (16^th Edition):

Craft, Aaron E. “Design, construction, and demonstration of a neutron beamline and a neutron imaging facility at a Mark-I TRIGA reactor.” 2013. Doctoral Dissertation, Colorado School of Mines. Accessed February 27, 2021. http://hdl.handle.net/11124/78115.

MLA Handbook (7^th Edition):

Craft, Aaron E. “Design, construction, and demonstration of a neutron beamline and a neutron imaging facility at a Mark-I TRIGA reactor.” 2013. Web. 27 Feb 2021.

Vancouver:

Craft AE. Design, construction, and demonstration of a neutron beamline and a neutron imaging facility at a Mark-I TRIGA reactor. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11124/78115.

Council of Science Editors:

Craft AE. Design, construction, and demonstration of a neutron beamline and a neutron imaging facility at a Mark-I TRIGA reactor. [Doctoral Dissertation]. Colorado School of Mines; 2013. Available from: http://hdl.handle.net/11124/78115

Penn State University

7. Nattress, Jason Thomas. Capture-gated Neutron Spectroscopy with a Novel Lithium-glass-polymer Composite Scintillation Detector.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27333

► The shortage of helium-3, a gas widely used in neutron detectors, has stimulated the development of neutron detection technologies based on alternative materials. Although one… (more)

▼ The shortage of helium-3, a gas widely used in neutron detectors, has stimulated the development of neutron detection technologies based on alternative materials. Although one type of detector may not be able to perform as excellent as helium-3 in every metric, a detector with modest absolute neutron detection efficiency combined with additional capabilities, such as spectroscopy, could potentially fill some of the need left from the dwindling supply. The key concerns in addressing this current need are speed, accuracy, and precision in detecting and measuring the properties of neutron sources. A major challenge facing the nuclear security community is the detection and characterization of special nuclear material for safeguards applications. Special nuclear material (SNM) emits both neutron and gamma radiation, but at a low rate. Gamma rays emitted by SNM can be readily shielded by high-Z materials. In contrast, fast neutrons can be more penetrating through high-Z materials, providing an opportunity for detection of SNM. Furthermore, the ability to measure neutron energy could enhance the ability to identify the presence of SNM, especially if neutron energy can be measured on an event-by-event basis. In this work, the development of a fast neutron detector that can potentially provide direct energy measurement of the incident neutron on a single-event basis is discussed. A capture-gated technique is used to identify thermalization events of incident neutrons, which are representative of incident neutron energy. Specifically, spectroscopic measurements conducted with a glass-polymer composite neutron detector are examined and light yield as a function of incident neutron energy is characterized. The neutron scintillator constructed utilizes both pulse height and pulse shape discrimination to achieve outstanding gamma rejection, with one of every 10⁸ gamma events misidentified as a neutron. Monte Carlo simulations were conducted to define capture gating timing acceptance windows and to substantiate the correlation of the total light output produced in neutron thermalization to the incident neutron energy. Other simulations were performed to show the relative capture efficiency at various neutron energies. The cylindrical detector used in this work is 5.08 cm in diameter and 5.05 cm in height and was fabricated using 1-mm square lithium glass rods and scintillating polyvinyl toluene. The light output produced when the detector was exposed to fast monoenergetic neutron sources has been measured using capture-gated coincidence techniques. The results of the simulations and experiments are discussed and the measurement potential of the detector is assessed. Advisors/Committee Members: Igor Jovanovic, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Neutron Spectroscopy; neutron detectors; composite; capture-gated

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APA (6^th Edition):

Nattress, J. T. (2015). Capture-gated Neutron Spectroscopy with a Novel Lithium-glass-polymer Composite Scintillation Detector. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27333

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nattress, Jason Thomas. “Capture-gated Neutron Spectroscopy with a Novel Lithium-glass-polymer Composite Scintillation Detector.” 2015. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/27333.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nattress, Jason Thomas. “Capture-gated Neutron Spectroscopy with a Novel Lithium-glass-polymer Composite Scintillation Detector.” 2015. Web. 27 Feb 2021.

Vancouver:

Nattress JT. Capture-gated Neutron Spectroscopy with a Novel Lithium-glass-polymer Composite Scintillation Detector. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/27333.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nattress JT. Capture-gated Neutron Spectroscopy with a Novel Lithium-glass-polymer Composite Scintillation Detector. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27333

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tennessee – Knoxville

8. Rinehart, Samantha Jae. Neutron Studies of Multi-Component Polymer Thin Films: Stratification and Interfacial Structure.

Degree: 2019, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/5430

► This dissertation presents the impact fabrication conditions have upon layer composition, purity, and interfacial clarity of multi-component thin films on both rigid and flexible substrates.… (more)

▼ This dissertation presents the impact fabrication conditions have upon layer composition, purity, and interfacial clarity of multi-component thin films on both rigid and flexible substrates. The performance of the multi-functional thin films is directly linked to the macroscopic assembly in a thin film. Prior to production of a novel thin film systems, the suitable fabrication methods required for optimum performance must be determined. Oftentimes, this is pursued on a tedious trial and error basis. Thus, guidelines established upon the thermodynamic and kinetic properties of the thin film are essential for improving processing efficiency and enhancing overall product performance.Chapter Two of this dissertation outlines the procedure for a novel method of quantifying the stratification of polymer blend thin films. Application of this technique revealed definitive control over the final film depth profile simply by altering the processing conditions. Instead of simply stating the effect of processing condition upon the final film depth profile and the extent of stratification, each processing condition was reported as the thermodynamic and kinetic properties of fabrication. Chapter Three expands upon the thermodynamic driving forces responsible for stratification outlined in Chapter Two and describes a hierarchy of thermodynamic properties responsible for stratification. Both Chapter Two and Three investigate the vertical stratification of a polymer blend. Chapter Four considers the lateral phase separation of the blend under the same thermodynamic and kinetic parameters. Chapter Five investigates the extent of control substrate rigidity has upon the order of the thin film and the order at each interface of sputtered multi-layer thin films.Ultimately, this work provides strong evidence that each processing parameter influences the entire structure of thin films. Control of polymer processing (either as a blend or as substrates) is crucial for product and thin film fabrication. The lack of control during processing will result in inconsistent final film structures, a film feature known to impact product performance. With the knowledge of stratification control and substrate influence upon final film structure, this information can be tailored to a diverse collection of polymer blended systems and endless multi-component applications.

Subjects/Keywords: polymer; neutron scattering; neutron reflectivity; stratification; interfaces

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APA (6^th Edition):

Rinehart, S. J. (2019). Neutron Studies of Multi-Component Polymer Thin Films: Stratification and Interfacial Structure. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/5430

Chicago Manual of Style (16^th Edition):

Rinehart, Samantha Jae. “Neutron Studies of Multi-Component Polymer Thin Films: Stratification and Interfacial Structure.” 2019. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed February 27, 2021. https://trace.tennessee.edu/utk_graddiss/5430.

MLA Handbook (7^th Edition):

Rinehart, Samantha Jae. “Neutron Studies of Multi-Component Polymer Thin Films: Stratification and Interfacial Structure.” 2019. Web. 27 Feb 2021.

Vancouver:

Rinehart SJ. Neutron Studies of Multi-Component Polymer Thin Films: Stratification and Interfacial Structure. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2019. [cited 2021 Feb 27]. Available from: https://trace.tennessee.edu/utk_graddiss/5430.

Council of Science Editors:

Rinehart SJ. Neutron Studies of Multi-Component Polymer Thin Films: Stratification and Interfacial Structure. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2019. Available from: https://trace.tennessee.edu/utk_graddiss/5430

Kansas State University

9. Cooper, Brian W. Microstructured silicon carbide neutron detectors.

Degree: MS, Department of Mechanical and Nuclear Engineering, 2019, Kansas State University

URL: http://hdl.handle.net/2097/40097

► Silicon carbide is a material of interest in many ventures as an intriguing semiconducting material for use as high voltage, high temperature, high power, or… (more)

▼ Silicon carbide is a material of interest in many ventures as an intriguing semiconducting material for use as high voltage, high temperature, high power, or high frequency devices. Silicon carbide is physically extremely tough and durable and is also very chemically resistant. The work presented here details using silicon carbide (SiC) as the semiconducting substrate for a high-efficiency neutron detector. The work begins with the fabrication of planar SiC neutron detectors utilizing ¹⁰B as the neutron conversion material. The SiC substrate was patterned via photolithography techniques prior to the deposition of an etchant mask. The following materials were used as etchant mask materials; nickel, indium tin oxide, and aluminum. The SiC devices were plasma etched using SF₆ based gas chemistries. The desired trench profile was 4 microns wide with desired depth between 10 and 20 microns. The formation of microfeatures within the trenches was observed during several etching trials as well as the trench profile narrowing to a point. After etching, titanium/gold contacts were fabricated using e-beam evaporation and various masking techniques. Next the devices were electrically tested for leakage current and capacitance. Typical leakage current was <10 pA at 100 V applied bias with a capacitance of <10 pF. Then the devices were backfilled with enriched ¹⁰B powder. The backfilled devices were tested with alpha particles, gamma rays, and neutrons. The neutron sources used were ²⁵²Cf and the Kansas State University TRIGA Reactor diffracted beamport. The devices proved to have low gamma sensitivity with respect to neutrons. When the devices were irradiated by high-activity alpha particle sources, significant charge trapping and device polarization was observed. The initial devices were 10 mm x 10 mm, but due to complications during the etchant mask formation, the device size was changed to 5 mm x 5 mm. The 5 mm x 5 mm devices were tested for neutron sensitivity using the ²⁵²Cf source and the diffracted beamport. Thermal neutron efficiency of 2.28±0.031% was measured. The final SiC wafer was patterned with the top contact and etchant mask. However, during dicing, the layers delaminated and peeled of the SiC substrate. Substantial efforts were made to pattern the remaining partial wafer to little success. Advisors/Committee Members: Douglas S. McGregor.

Subjects/Keywords: Silicon carbide; Neutron; Neutron detector; Plasma etching

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APA (6^th Edition):

Cooper, B. W. (2019). Microstructured silicon carbide neutron detectors. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/40097

Chicago Manual of Style (16^th Edition):

Cooper, Brian W. “Microstructured silicon carbide neutron detectors.” 2019. Masters Thesis, Kansas State University. Accessed February 27, 2021. http://hdl.handle.net/2097/40097.

MLA Handbook (7^th Edition):

Cooper, Brian W. “Microstructured silicon carbide neutron detectors.” 2019. Web. 27 Feb 2021.

Vancouver:

Cooper BW. Microstructured silicon carbide neutron detectors. [Internet] [Masters thesis]. Kansas State University; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2097/40097.

Council of Science Editors:

Cooper BW. Microstructured silicon carbide neutron detectors. [Masters Thesis]. Kansas State University; 2019. Available from: http://hdl.handle.net/2097/40097

University of New South Wales

10. White, Reyner. Magnetism and Properties of Three Rare Earth Intermetallic Series.

Degree: Physical, Environmental & Mathematical Sciences, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true

► Three intermetallic series with increasing rare earth dilution are examined and their magnetic and physical properties are determined. Of the first series, RNiAl₄, five materials… (more)

▼ Three intermetallic series with increasing rare earth dilution are examined and their magnetic and physical properties are determined. Of the first series, RNiAl₄, five materials are examined. For the TbNiAl₄ case, the incommensurate magnetic structure has been determined and then used to rationalise results from previous low temperature nuclear orientation (LTNO) studies. Similarly for NdNiAl₄, a model incommensurate structure has been used to simulate an LTNO experiment. For PrNiAl₄, the presence of an incommensurate magnetic phase has been confirmed and the magnetic structure determined. For ErNiAl₄, the magnetic structure has been charted from well below the ordering temperature to well above it. In DyNiAl₄, two magnetic structures have been identified: a higher temperature incommensurate phase and a lower temperature commensurate phase and these coexist in zero applied field, a first for the series. A reanalysis of existing TbNiAl₄ data has also identified similar phase coexistence. The collective results are used to examine trends across the series.Of the RM₂Al₁₀ series, TbRu₂Al₁₀ has been examined in depth. The material possesses two phase transitions as a function of temperature at TN = 15.0(3) K and TN' = 6.5(3) K and three more as a function of applied field at 2 K, at 1.30(3) T, 1.85(3) T and 3.20(3) T. These metamagnetic transitions transform the low temperature incommensurate square wave structure into two identifiably different 'pulse wave' structures and then to a para/ferromagnetic structure respectively. A magnetic phase diagram has been created and comparisons between TbRu₂Al₁₀ and other RM₂Al₁₀ compounds have been made as well as comparisons with the RNiAl₄ series.For the RM₂Al₂₀ series, three materials were analysed. For NdTi₂Al₂₀, a neutron diffraction experiment was performed at very low temperatures (70 mK) however no magnetic diffraction peaks were observed. DyTi₂Al₂₀ was subject to a similar experiment at 30 mK, where a commensurate antiferromagnetic structure was found. For TmV₂Al₂₀, inelastic neutron scattering was used to determine the crystal field parameters of the Tm³⁺ ion. Improvements were made to the original parameters obtained from bulk measurements, with W = 0.43(1) K and x = -0.63(1) using the Lea, Leask and Wolf formalism. Advisors/Committee Members: Hutchison, Wayne, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW, Cadogan, Sean, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW.

Subjects/Keywords: Neutron Diffraction; Magnetism; Intermetallics; Inelastic Neutron Scattering

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APA (6^th Edition):

White, R. (2018). Magnetism and Properties of Three Rare Earth Intermetallic Series. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

White, Reyner. “Magnetism and Properties of Three Rare Earth Intermetallic Series.” 2018. Doctoral Dissertation, University of New South Wales. Accessed February 27, 2021. http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true.

MLA Handbook (7^th Edition):

White, Reyner. “Magnetism and Properties of Three Rare Earth Intermetallic Series.” 2018. Web. 27 Feb 2021.

Vancouver:

White R. Magnetism and Properties of Three Rare Earth Intermetallic Series. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Feb 27]. Available from: http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true.

Council of Science Editors:

White R. Magnetism and Properties of Three Rare Earth Intermetallic Series. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true

Johannes Gutenberg Universität Mainz

11. Siemensen, Christian. Untersuchung der Ladung des Neutrons.

Degree: 2015, Johannes Gutenberg Universität Mainz

URL: http://ubm.opus.hbz-nrw.de/volltexte/2015/4170/

►

Die Quantisierung der elektrischen Ladung ist eine der größten Fragestellungen der Physik, die bis heute nicht verstanden ist. Im Standardmodell der Teilchenphysik ist sie beispielsweise… (more)

▼

Die Quantisierung der elektrischen Ladung ist eine der größten Fragestellungen der Physik, die bis heute nicht verstanden ist. Im Standardmodell der Teilchenphysik ist sie beispielsweise nicht mathematisch inhärent erklärbar. Dadurch wäre es möglich, dass das Neutron eine winzige Ladung tragen kann. In dieser Arbeit wurde eine Apparatur auf Grundlage eines Vorgängerexperiments entwickelt, mit der eine Untersuchung der Ladung des Neutrons mit höchster Präzision durchgeführt werden kann. Dabei werden ultrakalte Neutronen in einem optischen System einem elektrischen Feld zwischen zwei Elektrodenplatten ausgesetzt. In der ersten Ladungsmessung mit dieser Apparatur konnte eine statistische Sensitivität von δq≈2,4∙10⁻²⁰ e/√d erreicht werden. Diese Sensitivität ist die höchste, die bisher mit ultrakalten Neutronen für eine Ladungsmessung erreicht werden konnte. In dieser Arbeit wurde das Konzept des Vorgängerexperiments grundlegend überarbeitet, um die Sensitivität der Apparatur zu erhöhen. Es wurden detaillierte Untersuchungen der Systematik der Apparatur durchgeführt und das theoretische Potential der Sensitivität von derzeit δq≈10⁻²¹ e/√d ermittelt. Mit dieser Apparatur wurde der Grundstein für die Messung einer neuen niedrigeren oberen Grenze der elektrischen Ladung des Neutrons gelegt. In nächster Zeit kann dadurch eine niedrigere obere Grenze für die Ladung des Neutrons von q≈10⁻²² e erzielt werden.

The quantization of the electric charge is one of the biggest mysteries in physics and not understood until now. In the standard model of particle physics, it is however not mathematically inherent explainable. Thus, the neutron can carry a tiny charge. In this thesis an apparatus was designed to test the neutron electric charge with highest precision. It is based on a former experiment. Ultracold neutrons are exposed to an electric field between two electrodes in an optical system. The first charge measurement with this apparatus yielded a statistical sensitivity of δq≈2,4∙10⁻²⁰ e / √d. This sensitivity is the highest that could be achieved so far with ultracold neutrons for a charge measurement. In this work, the concept of the previous experiment was fundamentally revised in order to increase the sensitivity of the apparatus. Detailed studies of the setup revealed its theoretical sensitivity of currently δq≈10⁻²¹ e / √d. This apparatus is the basis for the measurement of a new lower upper limit of the electric charge of the neutron. In the near future, a lower upper limit for the charge of the neutron of q≈10⁻²² e can be achieved.

Subjects/Keywords: Ladungsquantisierung; UCN; Neutronenoptik; Neutron; Neutronenladung; Electric charge quantisation; UCN; neutron optics; neutron; neutron charge; Physics

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APA (6^th Edition):

Siemensen, C. (2015). Untersuchung der Ladung des Neutrons. (Doctoral Dissertation). Johannes Gutenberg Universität Mainz. Retrieved from http://ubm.opus.hbz-nrw.de/volltexte/2015/4170/

Chicago Manual of Style (16^th Edition):

Siemensen, Christian. “Untersuchung der Ladung des Neutrons.” 2015. Doctoral Dissertation, Johannes Gutenberg Universität Mainz. Accessed February 27, 2021. http://ubm.opus.hbz-nrw.de/volltexte/2015/4170/.

MLA Handbook (7^th Edition):

Siemensen, Christian. “Untersuchung der Ladung des Neutrons.” 2015. Web. 27 Feb 2021.

Vancouver:

Siemensen C. Untersuchung der Ladung des Neutrons. [Internet] [Doctoral dissertation]. Johannes Gutenberg Universität Mainz; 2015. [cited 2021 Feb 27]. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2015/4170/.

Council of Science Editors:

Siemensen C. Untersuchung der Ladung des Neutrons. [Doctoral Dissertation]. Johannes Gutenberg Universität Mainz; 2015. Available from: http://ubm.opus.hbz-nrw.de/volltexte/2015/4170/

University of Utah

12. Moffitt, Gregory Bruce. Neutron interaction tool, pyNIC for advanced applications in nuclear power, nuclear medicine, and nuclear security.

Degree: MS, Civil & Environmental Engineering, 2014, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3338/rec/1681

► A neutron interaction simulation tool, PyNIC, was developed for the calculation of neutron activation products and prompt gamma ray emission from neutron capture, neutron inelastic… (more)

Subjects/Keywords: Activation; Analysis; Neutron

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APA (6^th Edition):

Moffitt, G. B. (2014). Neutron interaction tool, pyNIC for advanced applications in nuclear power, nuclear medicine, and nuclear security. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3338/rec/1681

Chicago Manual of Style (16^th Edition):

Moffitt, Gregory Bruce. “Neutron interaction tool, pyNIC for advanced applications in nuclear power, nuclear medicine, and nuclear security.” 2014. Masters Thesis, University of Utah. Accessed February 27, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3338/rec/1681.

MLA Handbook (7^th Edition):

Moffitt, Gregory Bruce. “Neutron interaction tool, pyNIC for advanced applications in nuclear power, nuclear medicine, and nuclear security.” 2014. Web. 27 Feb 2021.

Vancouver:

Moffitt GB. Neutron interaction tool, pyNIC for advanced applications in nuclear power, nuclear medicine, and nuclear security. [Internet] [Masters thesis]. University of Utah; 2014. [cited 2021 Feb 27]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3338/rec/1681.

Council of Science Editors:

Moffitt GB. Neutron interaction tool, pyNIC for advanced applications in nuclear power, nuclear medicine, and nuclear security. [Masters Thesis]. University of Utah; 2014. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3338/rec/1681

Colorado State University

13. Scallan, Lisa Marie. Efficiency modeling for neutron detectors.

Degree: MS(M.S.), Environmental and Radiological Health Sciences, 2014, Colorado State University

URL: http://hdl.handle.net/10217/84139

► Neutron detectors are used for various applications, such as for workplace monitoring in a neutron field, during nuclear incidents, and for the detection of contraband… (more)

Subjects/Keywords: detector; radiation; neutron

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APA (6^th Edition):

Scallan, L. M. (2014). Efficiency modeling for neutron detectors. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/84139

Chicago Manual of Style (16^th Edition):

Scallan, Lisa Marie. “Efficiency modeling for neutron detectors.” 2014. Masters Thesis, Colorado State University. Accessed February 27, 2021. http://hdl.handle.net/10217/84139.

MLA Handbook (7^th Edition):

Scallan, Lisa Marie. “Efficiency modeling for neutron detectors.” 2014. Web. 27 Feb 2021.

Vancouver:

Scallan LM. Efficiency modeling for neutron detectors. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10217/84139.

Council of Science Editors:

Scallan LM. Efficiency modeling for neutron detectors. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/84139

University of Florida

14. Harkness, Allen Ira, III. Safeguards Approaches for Spent Nuclear Fuel in Dry Cask Storage.

Degree: PhD, Nuclear Engineering Sciences - Nuclear and Radiological Engineering, 2018, University of Florida

URL: https://ufdc.ufl.edu/UFE0052917

► Spent nuclear fuel is currently being stored in dry casks as an interim storage solution. Demand for this storage method has increased globally and the… (more)

Subjects/Keywords: mcnp – neutron – safeguards

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APA (6^th Edition):

Harkness, Allen Ira, I. (2018). Safeguards Approaches for Spent Nuclear Fuel in Dry Cask Storage. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0052917

Chicago Manual of Style (16^th Edition):

Harkness, Allen Ira, III. “Safeguards Approaches for Spent Nuclear Fuel in Dry Cask Storage.” 2018. Doctoral Dissertation, University of Florida. Accessed February 27, 2021. https://ufdc.ufl.edu/UFE0052917.

MLA Handbook (7^th Edition):

Harkness, Allen Ira, III. “Safeguards Approaches for Spent Nuclear Fuel in Dry Cask Storage.” 2018. Web. 27 Feb 2021.

Vancouver:

Harkness, Allen Ira I. Safeguards Approaches for Spent Nuclear Fuel in Dry Cask Storage. [Internet] [Doctoral dissertation]. University of Florida; 2018. [cited 2021 Feb 27]. Available from: https://ufdc.ufl.edu/UFE0052917.

Council of Science Editors:

Harkness, Allen Ira I. Safeguards Approaches for Spent Nuclear Fuel in Dry Cask Storage. [Doctoral Dissertation]. University of Florida; 2018. Available from: https://ufdc.ufl.edu/UFE0052917

University of Illinois – Urbana-Champaign

15. Myers, Luke S. Deuteron compton scattering below pion threshold.

Degree: PhD, 0240, 2011, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/18332

► A series of experiments were performed at the Tagged Photon Facility at MAX-lab in Lund, Sweden to study photon scattering from the deuteron and extract… (more)

Subjects/Keywords: Neutron; Isoscalar; Polarizability

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APA (6^th Edition):

Myers, L. S. (2011). Deuteron compton scattering below pion threshold. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18332

Chicago Manual of Style (16^th Edition):

Myers, Luke S. “Deuteron compton scattering below pion threshold.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 27, 2021. http://hdl.handle.net/2142/18332.

MLA Handbook (7^th Edition):

Myers, Luke S. “Deuteron compton scattering below pion threshold.” 2011. Web. 27 Feb 2021.

Vancouver:

Myers LS. Deuteron compton scattering below pion threshold. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2142/18332.

Council of Science Editors:

Myers LS. Deuteron compton scattering below pion threshold. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18332

Clemson University

16. Huffer, Benjamin David. Porous Nanostructured 4Ï€ Neutron Conversion Layers for Improved Sensitivity and Gamma-Ray Rejection in Gas-Filled Radiation Detectors.

Degree: MS, Environmental Engineering and Earth Sciences, 2019, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/3153

► This work investigated a neutron detection media comprising porous nanomaterial membranes to mitigate self-absorbance of neutron reaction products (Î±, 7Li) typical of micron-sized neutron… (more)

Subjects/Keywords: BNNTs; Neutron Detection

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APA (6^th Edition):

Huffer, B. D. (2019). Porous Nanostructured 4Ï€ Neutron Conversion Layers for Improved Sensitivity and Gamma-Ray Rejection in Gas-Filled Radiation Detectors. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3153

Chicago Manual of Style (16^th Edition):

Huffer, Benjamin David. “Porous Nanostructured 4Ï€ Neutron Conversion Layers for Improved Sensitivity and Gamma-Ray Rejection in Gas-Filled Radiation Detectors.” 2019. Masters Thesis, Clemson University. Accessed February 27, 2021. https://tigerprints.clemson.edu/all_theses/3153.

MLA Handbook (7^th Edition):

Huffer, Benjamin David. “Porous Nanostructured 4Ï€ Neutron Conversion Layers for Improved Sensitivity and Gamma-Ray Rejection in Gas-Filled Radiation Detectors.” 2019. Web. 27 Feb 2021.

Vancouver:

Huffer BD. Porous Nanostructured 4Ï€ Neutron Conversion Layers for Improved Sensitivity and Gamma-Ray Rejection in Gas-Filled Radiation Detectors. [Internet] [Masters thesis]. Clemson University; 2019. [cited 2021 Feb 27]. Available from: https://tigerprints.clemson.edu/all_theses/3153.

Council of Science Editors:

Huffer BD. Porous Nanostructured 4Ï€ Neutron Conversion Layers for Improved Sensitivity and Gamma-Ray Rejection in Gas-Filled Radiation Detectors. [Masters Thesis]. Clemson University; 2019. Available from: https://tigerprints.clemson.edu/all_theses/3153

Georgia Tech

17. Sharma, Ketki. Electrosorption of ions from aqueous solutions by mesoporous carbon materials.

Degree: PhD, Civil and Environmental Engineering, 2014, Georgia Tech

URL: http://hdl.handle.net/1853/53399

► Electrosorption involves the application of an electrical potential between carbon electrode pairs submerged in brackish water, effectively “trapping” the ions in an electrical double layer… (more)

▼ Electrosorption involves the application of an electrical potential between carbon electrode pairs submerged in brackish water, effectively “trapping” the ions in an electrical double layer at the solid-liquid interface. Electrosorption has significant applications in environmental engineering, including desalination of water by capacitive deionization (CDI), and in energy storage by supercapacitors. This work combines experimental and modeling studies to investigate the transport and sorption mechanisms of ions in the pores of mesoporous carbon materials that were synthesized at the Oak Ridge National Laboratory (ORNL). The main contribution of this research is examining the effects of operational parameters such as applied potential, solution temperature, ionic concentration, and valence of ions, on the electrosorption behavior of mesoporous carbon materials with the aim to improve the desalination efficiency in the CDI process. It was found that the rates of sorption by mesoporous carbon electrodes and their regeneration increased at a higher temperature and on application of a high-frequency, low-amplitude AC signal. Neutron imaging has been employed as a tool to visually observe and quantify the transport and distribution of ions within the carbon electrodes. The neutron images revealed interesting ion transport phenomena that can aid in the optimization of the CDI process. From the ion concentration profiles inside the electrodes, the effective diffusivities of gadolinium and lithium ions were obtained under various conditions of applied potential. Information on the diffusivity of ions can aid in theoretical modeling of the CDI process as well as guide strategies for the design of advanced electrode materials. In the final part of the study, the extraction of salinity gradient energy or ‘blue energy’ by mixing fluids of different salinities was assessed based on the principle of capacitive double layer expansion. Neutron imaging of blue energy recovery cycles was conducted to observe the ion transport behavior during the various steps of the cycle. The results obtained provide insights into the fundamental ion transport mechanisms during electrosorption by mesoporous carbon materials. This research has important implications for developing advanced system designs for desalination of saline water and energy storage devices. Advisors/Committee Members: Yiacoumi, Sotira (advisor), Tsouris, Costas (committee member), Pavlostathis, Spyros G. (committee member), Payne, Christine (committee member), Huang, Ching-Hua (committee member).

Subjects/Keywords: Electrosorption; Neutron imaging

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APA (6^th Edition):

Sharma, K. (2014). Electrosorption of ions from aqueous solutions by mesoporous carbon materials. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53399

Chicago Manual of Style (16^th Edition):

Sharma, Ketki. “Electrosorption of ions from aqueous solutions by mesoporous carbon materials.” 2014. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021. http://hdl.handle.net/1853/53399.

MLA Handbook (7^th Edition):

Sharma, Ketki. “Electrosorption of ions from aqueous solutions by mesoporous carbon materials.” 2014. Web. 27 Feb 2021.

Vancouver:

Sharma K. Electrosorption of ions from aqueous solutions by mesoporous carbon materials. [Internet] [Doctoral dissertation]. Georgia Tech; 2014. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1853/53399.

Council of Science Editors:

Sharma K. Electrosorption of ions from aqueous solutions by mesoporous carbon materials. [Doctoral Dissertation]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53399

Georgia Tech

18. Benson, Bixler C. Feasibility of creating a neutron detector array for the detection of special nuclear materials.

Degree: MS, Mechanical Engineering, 2015, Georgia Tech

URL: http://hdl.handle.net/1853/60397

► The purpose of this research is to determine the feasibility of creating an energy-dependent neutron detector array that could be used to detect special nuclear… (more)

▼ The purpose of this research is to determine the feasibility of creating an energy-dependent neutron detector array that could be used to detect special nuclear materials. The proposed detector array is composed of idealized thermal neutron detectors covered by moderators of differing size, namely thickness and shape. Through a series of Monte Carlo radiation transport calculations, the size, shape, and location of the moderators and detectors were configured to determine the efficacy of obtaining a neutron energy spectrum or spectral information in a single measurement. This approach expands on the concepts of the Bonner Sphere Spectrometer (BSS) which relies on multiple measurements using differing size moderating spheres. Although a proven approach, the traditional BSS method is not practicable for military applications. The alternative approach to the spectrum measurement is the use of detector sums or ratios to distinguish fission neutron spectra from other neutron spectra that might be encountered. Several 5x5 detector/moderator arrays were modeled in MCNP to determine which models would have the best responses to monoenergetic neutron sources. Five models of 5x5 detector arrays were chosen that best optimize the detectors reaction rates over certain energy ranges. This 5x25 detector array was then simulated with monoenergetic neutron sources and fission sources. A least squares fitting method was attempted to find coefficients that would generate a weighted sum of detectors that yield a flat fluence response. The response function did not have a flat response. The 5x25 detector system did produce characteristic curves for moderated and unmoderated fission sources. A 5x30 detector array that contained a 5x5 detector array that had a beryllium layer was also simulated. The 5x30 detector array had a higher response to high energy neutrons, but not a significant increase for low energy neutrons. The resulting 5x25 system that was designed is capable of being vehicle mounted so it would be mobile. This research shows that it is feasible to create a neutron detector array that is sensitive to neutron energy spectra. Advisors/Committee Members: Hertel, Nolan (advisor), Wang, Chris (committee member), Shannon, Michael (committee member).

Subjects/Keywords: Neutron detection; MCNP

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APA (6^th Edition):

Benson, B. C. (2015). Feasibility of creating a neutron detector array for the detection of special nuclear materials. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60397

Chicago Manual of Style (16^th Edition):

Benson, Bixler C. “Feasibility of creating a neutron detector array for the detection of special nuclear materials.” 2015. Masters Thesis, Georgia Tech. Accessed February 27, 2021. http://hdl.handle.net/1853/60397.

MLA Handbook (7^th Edition):

Benson, Bixler C. “Feasibility of creating a neutron detector array for the detection of special nuclear materials.” 2015. Web. 27 Feb 2021.

Vancouver:

Benson BC. Feasibility of creating a neutron detector array for the detection of special nuclear materials. [Internet] [Masters thesis]. Georgia Tech; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1853/60397.

Council of Science Editors:

Benson BC. Feasibility of creating a neutron detector array for the detection of special nuclear materials. [Masters Thesis]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/60397

Colorado School of Mines

19. Wilson, Clinton R. Beamline improvements to the MInes NEutron Radiography (MINER) facility.

Degree: MS(M.S.), Metallurgical and Materials Engineering, 2016, Colorado School of Mines

URL: http://hdl.handle.net/11124/170599

► The Colorado School of Mines designed and installed a neutron radiography system at the United States Geological Survey TRIGA reactor (GSTR) in 2012. Several potential… (more)

Subjects/Keywords: neutron; beamline; radiography

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APA (6^th Edition):

Wilson, C. R. (2016). Beamline improvements to the MInes NEutron Radiography (MINER) facility. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170599

Chicago Manual of Style (16^th Edition):

Wilson, Clinton R. “Beamline improvements to the MInes NEutron Radiography (MINER) facility.” 2016. Masters Thesis, Colorado School of Mines. Accessed February 27, 2021. http://hdl.handle.net/11124/170599.

MLA Handbook (7^th Edition):

Wilson, Clinton R. “Beamline improvements to the MInes NEutron Radiography (MINER) facility.” 2016. Web. 27 Feb 2021.

Vancouver:

Wilson CR. Beamline improvements to the MInes NEutron Radiography (MINER) facility. [Internet] [Masters thesis]. Colorado School of Mines; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11124/170599.

Council of Science Editors:

Wilson CR. Beamline improvements to the MInes NEutron Radiography (MINER) facility. [Masters Thesis]. Colorado School of Mines; 2016. Available from: http://hdl.handle.net/11124/170599

RMIT University

20. Keehan, S. Risks posed by neutron contamination in high energy radiotherapy.

Degree: 2017, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:162207

► Radiotherapy is a common cancer treatment which aims to use radiation energy to kill tumour cells without damaging healthy tissue. High energy x-rays penetrate tissue… (more)

▼ Radiotherapy is a common cancer treatment which aims to use radiation energy to kill tumour cells without damaging healthy tissue. High energy x-rays penetrate tissue deeply, depositing most of their energy beyond the skin and shallow tissues. X-rays with energies above 8 MeV may interact to produce neutrons, to which the patient is then exposed. Treatment planning systems (TPS), which calculate the amount of energy deposited to biological structures, do not currently account for contaminant neutrons produced in high energy interactions. Constant improvements in modern radiotherapy techniques have resulted in better patient life expectancy than ever before. The unfortunate corollary of increased life span is increased manifestation of late onset side effects from low dose radiation exposure. This has resulted in an increased drive to reduce the dose to untargeted tissues as much as possible. A perfect treatment plan delivers a prescribed dose to the target volume and no dose to any other tissue. In reality, there is always some tissue through which the radiation must pass in order to reach the target, and some energy which passes beyond the intended target volume. In addition, there is unavoidable scattering of radiation within the patient, which results in out-of-field doses to untargeted tissue. Dose to untargeted tissues resulting from x-ray energy is relatively well understood and is calculated and reported by TPS. Dose resulting from contaminant neutrons is not currently considered by TPS. The overall number of neutrons produced is relatively low, because high energy x-rays may interact in a variety ways and reactions producing neutrons are generally less likely. However, energy deposited by radiation can produce different biological outcomes depending on the type of radiation which deposits the energy. The biological damage inflicted by neutron radiation depends on the energy of the neutrons, and neutrons with energy around 1 MeV may be up to 20 times more damaging than x-rays. So, how do we know the risk associated with neutrons produced from high energy x-rays? Measure the number of neutrons produced? Measure the amount of energy they deposit? Neutron radiation is incredibly difficult to quantify, much more so than alpha, beta, x-ray, gamma or proton radiation. Neutrons are neutrally charged particles, which means they are not attracted or repelled by the positive nuclei or negative electrons which make up all matter. Neutrons primarily pass straight through most materials without leaving a trace of evidence. This makes them quite difficult to detect! Neutrons do interact with the nuclei of some materials, in nuclear reactions, which produce energy and secondary particles which can more easily be detected. The extra energy released in these interactions and their complex probability functions make it difficult to determine the number of neutrons or the energy they would release in human tissue. The high uncertainty in neutron measurement techniques has resulted in some controversy around the use of…

Subjects/Keywords: Fields of Research; Neutron; Radiotherapy; Neutron detection; Neutron dosimetry; Activation

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APA (6^th Edition):

Keehan, S. (2017). Risks posed by neutron contamination in high energy radiotherapy. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:162207

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Keehan, S. “Risks posed by neutron contamination in high energy radiotherapy.” 2017. Thesis, RMIT University. Accessed February 27, 2021. http://researchbank.rmit.edu.au/view/rmit:162207.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Keehan, S. “Risks posed by neutron contamination in high energy radiotherapy.” 2017. Web. 27 Feb 2021.

Vancouver:

Keehan S. Risks posed by neutron contamination in high energy radiotherapy. [Internet] [Thesis]. RMIT University; 2017. [cited 2021 Feb 27]. Available from: http://researchbank.rmit.edu.au/view/rmit:162207.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Keehan S. Risks posed by neutron contamination in high energy radiotherapy. [Thesis]. RMIT University; 2017. Available from: http://researchbank.rmit.edu.au/view/rmit:162207

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Stellenbosch University

21. Singo, Thifhelimbilu Daphney. Development of a high flux neutron radiation detection system for in-core temperature monitoring.

Degree: PhD, Physics, 2012, Stellenbosch University

URL: http://hdl.handle.net/10019.1/19999

► ENGLISH ABSTRACT: The objective of this research was to develop a neutron detection system that incorporates a mass spectrometer to measure high neutron flux in… (more)

▼ ENGLISH ABSTRACT: The objective of this research was to develop a neutron detection system that incorporates a mass spectrometer to measure high neutron flux in a nuclear reactor environment. This system consists of slow and fast neutron detector elements for measuring fluxes in those energy regions respectively. The detector should further be capable of withstanding the harsh conditions associated with a high temperature reactor. This novel detector which was initially intended for use in the PBMR reactor has possible applications as an in-core neutron and indirect temperature-monitoring device in any of the HTGR. Simulations of a generic HTGR core model were performed in order to obtain the neutron energy spectrum with emphasis on the behavior of three energy regions, slow, intermediate and fast neutrons within the core at different temperatures. The slow neutron flux which has the characteristic of a Maxwell- Boltzmann distribution were found to shift to larger values of neutron flux at higher energies as the fuel temperature increased, while fast neutron flux spectra remained relatively constant. In addition, the results of the fit of the slow neutron flux with a modified Maxwell-Boltzmann equation confirmed that in the presence of the neutron source, leakage and absorption, the effective neutron temperatures is above the medium temperatures. From these results, it was clear that the detection system will need to monitor both slow and fast neutron flux. Placing neutron detectors inside the reactor core, that are sensitive to a particular energy range of slow and fast neutrons, would thus provide information about the change of temperature in the fuel and hence act as an in-core temperature monitor. A detection mechanism was developed that employs the neutron-induced break-up reaction of 6Li and 12C into α-particles. These materials make excellent neutron converters without interference due to γ-rays, as the contributions from 6Li(γ,np)4He and 12C(γ,3α) reactions are negligible. The mass spectrometer measures the 4He partial pressure as a function of time under high vacuum with the help of pressure gradient provided by a high-vacuum turbomolecular pump and a positive-displacement fore-vacuum pump connected in series. A cryogenic trap, which contains a molecular sieve made of pellets 1.6 mm in diameter, was also designed and manufactured to remove impurities which cause a background in the lighter mass region of the spectrum. The development and testing of the high flux neutron detection system were performed at the iThemba Laboratory for Accelerator Based Sciences (LABS), South Africa. These tests were carried out with a high energy proton beam at the D-line neutron facility, and with a fast neutron beam at the neutron radiation therapy facility. To test the principle and capability of the detection system in measuring high fluxes, a high intensity 66 MeV proton beam was used to produce a large yield of α-particles. This was done because the proton inelastic scattering… Advisors/Committee Members: Papka, Paul, Wyngaardt, Shaun M., Dobson, Robert T., Smit, Frederick D., Stellenbosch University. Faculty of Sciences. Dept. of Physics..

Subjects/Keywords: Physics; Neutron physics; Neutron transport; High flux neutron detection systems

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APA (6^th Edition):

Singo, T. D. (2012). Development of a high flux neutron radiation detection system for in-core temperature monitoring. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/19999

Chicago Manual of Style (16^th Edition):

Singo, Thifhelimbilu Daphney. “Development of a high flux neutron radiation detection system for in-core temperature monitoring.” 2012. Doctoral Dissertation, Stellenbosch University. Accessed February 27, 2021. http://hdl.handle.net/10019.1/19999.

MLA Handbook (7^th Edition):

Singo, Thifhelimbilu Daphney. “Development of a high flux neutron radiation detection system for in-core temperature monitoring.” 2012. Web. 27 Feb 2021.

Vancouver:

Singo TD. Development of a high flux neutron radiation detection system for in-core temperature monitoring. [Internet] [Doctoral dissertation]. Stellenbosch University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10019.1/19999.

Council of Science Editors:

Singo TD. Development of a high flux neutron radiation detection system for in-core temperature monitoring. [Doctoral Dissertation]. Stellenbosch University; 2012. Available from: http://hdl.handle.net/10019.1/19999

University of Texas – Austin

22. -4066-2303. Development of an in-core neutron monitoring system and characterization of the University of Texas at Austin TRIGA reactor steady-state neutron flux variations for use with Neutron Activation Analysis.

Degree: MSin Engineering, Mechanical Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/69096

► The pneumatic NAA facility within The University of Texas at Austin is widely used for the measurement of trace elemental concentrations. It has been shown… (more)

Subjects/Keywords: Neutron flux monitoring; Neutron Activation Analysis; Neutron flux variance

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APA (6^th Edition):

-4066-2303. (2018). Development of an in-core neutron monitoring system and characterization of the University of Texas at Austin TRIGA reactor steady-state neutron flux variations for use with Neutron Activation Analysis. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/69096

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-4066-2303. “Development of an in-core neutron monitoring system and characterization of the University of Texas at Austin TRIGA reactor steady-state neutron flux variations for use with Neutron Activation Analysis.” 2018. Masters Thesis, University of Texas – Austin. Accessed February 27, 2021. http://hdl.handle.net/2152/69096.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-4066-2303. “Development of an in-core neutron monitoring system and characterization of the University of Texas at Austin TRIGA reactor steady-state neutron flux variations for use with Neutron Activation Analysis.” 2018. Web. 27 Feb 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-4066-2303. Development of an in-core neutron monitoring system and characterization of the University of Texas at Austin TRIGA reactor steady-state neutron flux variations for use with Neutron Activation Analysis. [Internet] [Masters thesis]. University of Texas – Austin; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2152/69096.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-4066-2303. Development of an in-core neutron monitoring system and characterization of the University of Texas at Austin TRIGA reactor steady-state neutron flux variations for use with Neutron Activation Analysis. [Masters Thesis]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/69096

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Michigan State University

23. Deibel, Alex Thomas. Starquakes, heating anomalies, and nuclear reactions in the neutron star crust.

Degree: 2017, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:4629

►

"When the most massive stars perish, their cores may remain intact in the form of extremely dense and compact stars. These stellar remnants, called neutron… (more)

▼

"When the most massive stars perish, their cores may remain intact in the form of extremely dense and compact stars. These stellar remnants, called neutron stars, are on the cusp of becoming black holes and reach mass densities greater than an atomic nucleus in their centers. Although the interiors of neutron stars were difficult to investigate at the time of their discovery, the advent of modern space-based telescopes (e.g., Chandra X-ray Observatory) has pushed our understanding of the neutron star interior into exciting new realms. It has been shown that the neutron star interior spans an enormous range of densities and contains many phases of matter, and further theoretical progress must rely on numerical calculations of neutron star phenomena built with detailed nuclear physics input. To further investigate the properties of the neutron star interior, this dissertation constructs numerical models of neutron stars, applies models to various observations of neutron star high-energy phenomena, and draws new conclusions about the neutron star interior from these analyses. In particular, we model the neutron star's outermost 2248 1 km that encompasses the neutron star's envelope, ocean, and crust. The model must implement detailed nuclear physics to properly simulate the hydrostatic and thermal structure of the neutron star. We then apply our model to phenomena that occur in these layers, such as: thermonuclear bursts in the envelope, g-modes in the ocean, torsional oscillations of the crust, and crust cooling of neutron star transients. A comparison of models to observations provides new insights on the properties of dense matter that are often difficult to probe through terrestrial experiments. For example, models of the quiescent cooling of neutron stars, such as the accreting transient MAXI J0556-332, at late times into quiescence probe the thermal transport properties of the deep neutron star crust. This modeling provides independent data from astronomical observations on the nature of neutron superfluidity and the thermal conductivity of nuclear pasta. Our neutron star modeling efforts also pose new questions. For instance, reaction networks find that neutrino emission from cycling nuclear reactions is present in the neutron star ocean and crust, and potentially cools an accreting neutron star. This is a theory we attempt to verify using observations of neutron star transients and thermonuclear bursts, although it remains unclear if this cooling occurs. Furthermore, on some accreting neutron stars, more heat than supplied by nuclear reactions is needed to explain their high temperatures at the outset of quiescence. Although the presence of heating anomalies seems common, the source of extra heating is difficult to determine." – Pages ii-iii.

Online resource;

Advisors/Committee Members: Brown, Edward F, Chomiuk, Laura, Couch, Sean, Schatz, Hendrik, Linnemann, James.

Subjects/Keywords: Neutron stars – Mathematical models; Neutron stars – Observations; Neutron stars; Astrophysics

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APA (6^th Edition):

Deibel, A. T. (2017). Starquakes, heating anomalies, and nuclear reactions in the neutron star crust. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:4629

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Deibel, Alex Thomas. “Starquakes, heating anomalies, and nuclear reactions in the neutron star crust.” 2017. Thesis, Michigan State University. Accessed February 27, 2021. http://etd.lib.msu.edu/islandora/object/etd:4629.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Deibel, Alex Thomas. “Starquakes, heating anomalies, and nuclear reactions in the neutron star crust.” 2017. Web. 27 Feb 2021.

Vancouver:

Deibel AT. Starquakes, heating anomalies, and nuclear reactions in the neutron star crust. [Internet] [Thesis]. Michigan State University; 2017. [cited 2021 Feb 27]. Available from: http://etd.lib.msu.edu/islandora/object/etd:4629.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Deibel AT. Starquakes, heating anomalies, and nuclear reactions in the neutron star crust. [Thesis]. Michigan State University; 2017. Available from: http://etd.lib.msu.edu/islandora/object/etd:4629

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Addis Ababa University

24. Getu, Ferenji. Measurement of Thermal neutron capture cross section in Sb-121” .

Degree: 2013, Addis Ababa University

URL: http://etd.aau.edu.et/dspace/handle/123456789/1312

► The measurement of thermal neutron cross sections gives basic information about the internal structure of atomic nuclei and their structure. Measurement of Thermal Neutron cross-section… (more)

Subjects/Keywords: Neutron sources; Neutron interaction; Thermal neutron cross section; Slowing down of Neutron,; Neutron Activation analysis; HPGe

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APA (6^th Edition):

Getu, F. (2013). Measurement of Thermal neutron capture cross section in Sb-121” . (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/1312

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Getu, Ferenji. “Measurement of Thermal neutron capture cross section in Sb-121” .” 2013. Thesis, Addis Ababa University. Accessed February 27, 2021. http://etd.aau.edu.et/dspace/handle/123456789/1312.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Getu, Ferenji. “Measurement of Thermal neutron capture cross section in Sb-121” .” 2013. Web. 27 Feb 2021.

Vancouver:

Getu F. Measurement of Thermal neutron capture cross section in Sb-121” . [Internet] [Thesis]. Addis Ababa University; 2013. [cited 2021 Feb 27]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1312.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Getu F. Measurement of Thermal neutron capture cross section in Sb-121” . [Thesis]. Addis Ababa University; 2013. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1312

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tennessee – Knoxville

25. Harrison, Thomas Jay. Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations.

Degree: 2015, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/3583

► Neutron shielding problems involve radiation transport calculations over a wide range of energies. Fission neutrons have initial energy on the order of MeV, fusion neutrons… (more)

▼ Neutron shielding problems involve radiation transport calculations over a wide range of energies. Fission neutrons have initial energy on the order of MeV, fusion neutrons have initial energy on the order of 10s of MeV, and space-origin neutrons have initial energy on the order of 100s of MeV or higher. Shielding calculations must track the neutrons from their initial energies until they are no longer of interest; for deep-penetration neutrons, this final energy can be on the order of eV before the neutron is no longer tracked. Thus, for deep-penetration space radiation shielding problems, the calculation may require tracking the neutron energy through eight orders of magnitude. The shielding calculations also require the evaluation of the neutron cross section as a function of the neutron energy. However, the cross section value itself may range from 10-3 barn (1 mb) to nearly 109 barn (1 Gb), a range of twelve orders of magnitude. Further complicating the cross section analysis is the existence of resonance peaks; these peaks (or valleys) may show a change spanning multiple orders of magnitude in cross section value over less than a 1% change in neutron energy. The issue of cross section data sets with multiple resonance peaks can be resolved through the use of flux-weighted group cross sections. The most basic group structure is a single cross section; modern analytical codes can use more than 200 groups, or the full cross section data set itself. However, this introduces a tradeoff of efficiency (fewer groups) versus accuracy (more groups), and it also requires an a priori knowledge of the flux spectrum. This research proposes and tests a method to generate group-wise cross section data sets that do not require the a priori flux spectrum, which is equivalent to assuming a flat flux spectrum distribution. This method conserves the energy-integrated cross sections, which are an inherent characteristic of an isotope, instead of group-wise reaction rates, which are a function of the overall system. The net result is a reduction in calculation time without a significant loss in neutron survival and penetration results and the transmitted and reflected spectra.

Subjects/Keywords: Neutron Cross Section; Neutron Shielding; Monte Carlo Methods; Neutron Flux Spectrum; Nuclear; Nuclear Engineering

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APA (6^th Edition):

Harrison, T. J. (2015). Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/3583

Chicago Manual of Style (16^th Edition):

Harrison, Thomas Jay. “Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations.” 2015. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed February 27, 2021. https://trace.tennessee.edu/utk_graddiss/3583.

MLA Handbook (7^th Edition):

Harrison, Thomas Jay. “Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations.” 2015. Web. 27 Feb 2021.

Vancouver:

Harrison TJ. Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2015. [cited 2021 Feb 27]. Available from: https://trace.tennessee.edu/utk_graddiss/3583.

Council of Science Editors:

Harrison TJ. Methodology For Generating Simplified Cross Section Data Sets For Neutron Transport Calculations. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2015. Available from: https://trace.tennessee.edu/utk_graddiss/3583

University of Manitoba

26. Das, Moushumi Jr. Highly sensitive Rb magnetometer for neutron electric dipole moment experiments.

Degree: Physics and Astronomy, 2018, University of Manitoba

URL: http://hdl.handle.net/1993/33655

► A non-zero neutron electric dipole moment (nEDM) would indicate time-reversal and charge-parity violation. Our collaboration is developing an experiment at TRIUMF to improve the sensitivity… (more)

Subjects/Keywords: neutron electric dipole moment; neutron electric dipole moment; neutron electric dipole moment

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APA (6^th Edition):

Das, M. J. (2018). Highly sensitive Rb magnetometer for neutron electric dipole moment experiments. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33655

Chicago Manual of Style (16^th Edition):

Das, Moushumi Jr. “Highly sensitive Rb magnetometer for neutron electric dipole moment experiments.” 2018. Masters Thesis, University of Manitoba. Accessed February 27, 2021. http://hdl.handle.net/1993/33655.

MLA Handbook (7^th Edition):

Das, Moushumi Jr. “Highly sensitive Rb magnetometer for neutron electric dipole moment experiments.” 2018. Web. 27 Feb 2021.

Vancouver:

Das MJ. Highly sensitive Rb magnetometer for neutron electric dipole moment experiments. [Internet] [Masters thesis]. University of Manitoba; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1993/33655.

Council of Science Editors:

Das MJ. Highly sensitive Rb magnetometer for neutron electric dipole moment experiments. [Masters Thesis]. University of Manitoba; 2018. Available from: http://hdl.handle.net/1993/33655

University of Tennessee – Knoxville

27. Yue, Andrew T. Progress Toward a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux.

Degree: 2011, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/1243

► The reported lifetime in an in-beam neutron lifetime experiment performed at NIST was tn = (886.3 ± 3.4) s. The largest source of uncertainty was… (more)

Subjects/Keywords: fundamental neutron physics; neutron lifetime; neutron flux; lithium cross section; beam lifetime experiment

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APA (6^th Edition):

Yue, A. T. (2011). Progress Toward a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/1243

Chicago Manual of Style (16^th Edition):

Yue, Andrew T. “Progress Toward a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux.” 2011. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed February 27, 2021. https://trace.tennessee.edu/utk_graddiss/1243.

MLA Handbook (7^th Edition):

Yue, Andrew T. “Progress Toward a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux.” 2011. Web. 27 Feb 2021.

Vancouver:

Yue AT. Progress Toward a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2011. [cited 2021 Feb 27]. Available from: https://trace.tennessee.edu/utk_graddiss/1243.

Council of Science Editors:

Yue AT. Progress Toward a Redetermination of the Neutron Lifetime Through the Absolute Determination of Neutron Flux. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2011. Available from: https://trace.tennessee.edu/utk_graddiss/1243

University of Tennessee – Knoxville

28. Taylor, Steven Zachary. Beta-Delayed Neutron Spectroscopy of 135-136Sb Using the Versatile Array of Neutron Detectors at Low Energy (VANDLE).

Degree: 2018, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/5282

► Very neutron rich nuclei decay almost exclusively by β[beta] decay followed by the emission of a delayed neutron. The Versatile Array of Neutron Detectors at… (more)

Subjects/Keywords: beta decay; neutron emission; neutron spectroscopy; beta-delayed neutron decay; nuclear structure; shell model

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APA (6^th Edition):

Taylor, S. Z. (2018). Beta-Delayed Neutron Spectroscopy of 135-136Sb Using the Versatile Array of Neutron Detectors at Low Energy (VANDLE). (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/5282

Chicago Manual of Style (16^th Edition):

Taylor, Steven Zachary. “Beta-Delayed Neutron Spectroscopy of 135-136Sb Using the Versatile Array of Neutron Detectors at Low Energy (VANDLE).” 2018. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed February 27, 2021. https://trace.tennessee.edu/utk_graddiss/5282.

MLA Handbook (7^th Edition):

Taylor, Steven Zachary. “Beta-Delayed Neutron Spectroscopy of 135-136Sb Using the Versatile Array of Neutron Detectors at Low Energy (VANDLE).” 2018. Web. 27 Feb 2021.

Vancouver:

Taylor SZ. Beta-Delayed Neutron Spectroscopy of 135-136Sb Using the Versatile Array of Neutron Detectors at Low Energy (VANDLE). [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2018. [cited 2021 Feb 27]. Available from: https://trace.tennessee.edu/utk_graddiss/5282.

Council of Science Editors:

Taylor SZ. Beta-Delayed Neutron Spectroscopy of 135-136Sb Using the Versatile Array of Neutron Detectors at Low Energy (VANDLE). [Doctoral Dissertation]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_graddiss/5282

Royal Holloway, University of London

29. Willis, Toby. Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques.

Degree: PhD, 2017, Royal Holloway, University of London

URL: https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610

► The diffusion of ions within a battery material is inherently important to its capacity to charge and discharge electrons through a circuit during its normal… (more)

Subjects/Keywords: Battery; Diffusion; density functional theory (DFT); NaCoO2; LiLaTiO3; neutron diffraction; Neutron spectroscopy; Neutron scattering; crystal

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APA (6^th Edition):

Willis, T. (2017). Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques. (Doctoral Dissertation). Royal Holloway, University of London. Retrieved from https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610

Chicago Manual of Style (16^th Edition):

Willis, Toby. “Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques.” 2017. Doctoral Dissertation, Royal Holloway, University of London. Accessed February 27, 2021. https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610.

MLA Handbook (7^th Edition):

Willis, Toby. “Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques.” 2017. Web. 27 Feb 2021.

Vancouver:

Willis T. Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques. [Internet] [Doctoral dissertation]. Royal Holloway, University of London; 2017. [cited 2021 Feb 27]. Available from: https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610.

Council of Science Editors:

Willis T. Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques. [Doctoral Dissertation]. Royal Holloway, University of London; 2017. Available from: https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610

University of Tennessee – Knoxville

30. Frost, Matthew. Observation of Baryon Number Violation via Cold Neutron Sources.

Degree: 2019, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/5951

► Current models describing the fundamental nature of the universe suggest that Baryonnumber need not be conserved and would provide a valid argument as to the… (more)

Subjects/Keywords: particle physics; baryon asymmetry; neutron sources; neutron optics; nanoparticles; anti-neutron oscillation

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APA (6^th Edition):

Frost, M. (2019). Observation of Baryon Number Violation via Cold Neutron Sources. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/5951

Chicago Manual of Style (16^th Edition):

Frost, Matthew. “Observation of Baryon Number Violation via Cold Neutron Sources.” 2019. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed February 27, 2021. https://trace.tennessee.edu/utk_graddiss/5951.

MLA Handbook (7^th Edition):

Frost, Matthew. “Observation of Baryon Number Violation via Cold Neutron Sources.” 2019. Web. 27 Feb 2021.

Vancouver:

Frost M. Observation of Baryon Number Violation via Cold Neutron Sources. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2019. [cited 2021 Feb 27]. Available from: https://trace.tennessee.edu/utk_graddiss/5951.

Council of Science Editors:

Frost M. Observation of Baryon Number Violation via Cold Neutron Sources. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2019. Available from: https://trace.tennessee.edu/utk_graddiss/5951

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