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**Degree Discipline:**Physics

**Degree Level:**Master's

### Absolute Beta Counting Using Thick Sources

**Date:**1950

**Creator:**Anderson, Miles E., 1926-

**Description:**The problem with which we shall concern ourselves in this paper is the self-scattering and self-absorption of beta particles by the source.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc96872/

### Analyzing Magnet System for the Electrostatic Accelerator

**Date:**August 1954

**Creator:**Young, Thomas E.

**Description:**This thesis describes the design and construction of a linear accelerator, specifically, a positive-ion source, a high voltage supply, an accelerating column, and the necessary associated vacuum system.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130409/

### The Angular Distribution and Total Flux of Neutrons Obtained from the Deuterium-Tritium Reaction

**Date:**1956

**Creator:**Duggan, Jerome L.

**Description:**Mono-energetic neutrons have been produced with the low-voltage Cockroft-Walton accelerator at North Texas State College using two different reactions. It is the purpose of this paper to report the angular distribution and total flux of the neutrons obtained from the T(D,n) reaction.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc107901/

### The Angular Distribution of the Deuterium-Deuterium Neutrons with 100 Kev Deuterons

**Date:**1956

**Creator:**Hackfield, Bobby J.

**Description:**It is the purpose of this paper to present the experimental techniques used in obtaining. 3.25 MeV neutrons from the H2(d,n)He3 reaction, as well as an analysis of the experimental data.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc107904/

### Antiferromagnetic Ordering in Picryl-Amino-Carbazyl

**Date:**August 1964

**Creator:**Porter, Wilbur A.

**Description:**The purpose of the experiment was to investigate other paramagnetic salts to determine whether the W. B. perchlorate type peak was more common than previously suspected. An organic salt, picryl-n-amino-carbazyl, was chosen.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc163864/

### Application of the Finite Element Method to Some Simple Systems in One and Two Dimensions.

**Date:**May 2002

**Creator:**Hunnell, Jason C.

**Description:**The finite element method (FEM) is reviewed and applied to the one-dimensional eigensystems of the isotropic harmonic oscillator, finite well, infinite well and radial hydrogen atom, and the two-dimensional eigensystems of the isotropic harmonic oscillator and the propagational modes of sound in a rectangular cavity. Computer codes that I developed were introduced and utilized to find accurate results for the FEM eigensolutions. One of the computer codes was modified and applied to the one-dimensional unbound quantum mechanical system of a square barrier potential and also provided accurate results.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc3087/

### Application of the Wigner Formalism to a Slightly Relativistic Quantum Plasma

**Date:**August 1967

**Creator:**Harper, John H.

**Description:**A slightly relativistic fermion gas is described by the dynamical theory obtained from the Wigner distribution function. The problem is approached in a self-consistent manner including the two-body Darwin Hamiltonian. The goal is to find the departures from equilibrium and dispersion relations for wave propagation in the gas.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130850/

### Approach to Quantum Information starting from Bell's Inequality (Part I) and Statistical Analysis of Time Series Corresponding to Complex Processes (Part II)

**Access:**Use of this item is restricted to the UNT Community.

**Date:**May 2002

**Creator:**Failla, Roberto

**Description:**I: Quantum information obeys laws that subtly extend those governing classical information, making possible novel effect such as cryptography and quantum computation. Quantum computations are extremely sensitive to disruption by interaction of the computer with its environment, but this problem can be overcome by recently developed quantum versions of classical error-correcting codes and fault-tolerant circuits. Based on these ideas, the purpose of this paper is to provide an approach to quantum information by analyzing and demonstrating Bell's inequality and by discussing the problems related to decoherence and error-correcting. II: The growing need for a better understanding of complex processes has stimulated the development of new and more advanced data analysis techniques. The purpose of this research was to investigate some of the already existing techniques (Hurst's rescaled range and relative dispersion analysis), to develop a software able to process time series with these techniques, and to get familiar with the theory of diffusion processes.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc3092/

### Automatic Frequency Control of Microwave Radiation Sources

**Date:**August 1979

**Creator:**Payne, Bobby D.

**Description:**Resonant cavity controlled klystron frequency stabilization circuits and quartz-crystal oscillator frequency stabilization circuits were investigated for reflex klystrons operating at frequencies in the X-band range. The crystal oscillator circuit employed achieved better than 2 parts in 10 in frequency stability. A test of the functional properties of the frequency standard was made using the Stark effect in molecules.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc504304/

### Backscattering from Prolate Spheroids at Microwave Frequencies

**Date:**1956

**Creator:**Sybert, Jim

**Description:**This thesis examines backscattering from prolate spheroids at microwave frequencies.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc107919/

### Ballistic Deposition: Global Scaling and Local Time Series.

**Date:**December 2003

**Creator:**Schwettmann, Arne

**Description:**Complexity can emerge from extremely simple rules. A paradigmatic example of this is the model of ballistic deposition (BD), a simple model of sedimentary rock growth. In two separate Problem-in-Lieu-of Thesis studies, BD was investigated numerically in (1+1)-D on a lattice. Both studies are combined in this document. For problem I, the global interface roughening (IR) process was studied in terms of effective scaling exponents for a generalized BD model. The model used incorporates a tunable parameter B to change the cooperation between aggregating particles. Scaling was found to depart increasingly from the predictions of Kardar-Parisi-Zhang theory both with decreasing system sizes and with increasing cooperation. For problem II, the local single column evolution during BD rock growth was studied via statistical analysis of time series. Connections were found between single column time series properties and the global IR process.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc4392/

### Boundary Scattering of Electrons in Thin Cadmium Single Crystals

**Date:**August 1968

**Creator:**Fortmayer, Gary William

**Description:**In the present investigation, zinc was plated onto a cadmium crystal to determine the effect on the scattering parameter.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130996/

### Brownian Movement and Quantum Computers

**Access:**Use of this item is restricted to the UNT Community.

**Date:**December 2004

**Creator:**Habel, Agnieszka

**Description:**This problem in lieu of thesis is a discussion of two topics: Brownian movement and quantum computers. Brownian movement is a physical phenomenon in which the particle velocity is constantly undergoing random fluctuations. Chapters 2, 3 and 4, describe Brownian motion from three different perspectives. The next four chapters are devoted to the subject of quantum computers, which are the signal of a new era of technology and science combined together. In the first chapter I present to a reader the two topics of my problem in lieu of thesis. In the second chapter I explain the idea of Brownian motion, its interpretation as a stochastic process and I find its distribution function. The next chapter illustrates the probabilistic picture of Brownian motion, where the statistical averages over trajectories are related to the probability distribution function. Chapter 4 shows how to derive the Langevin equation, introduced in chapter 1, using a Hamiltonian picture of a bath with infinite number of harmonic oscillators. The chapter 5 explains how the idea of quantum computers was developed and how step-by-step all the puzzles for the field of quantum computers were created. The next chapter, chapter 6, discus the basic quantum unit of information ...

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc4660/

### A Calculation of the Kaon-Neutron Scattering Cross Section

**Date:**June 1966

**Creator:**Hooper, Robert Gibson

**Description:**The purpose of this investigation was to study the scattering processes of K+ mesons with neutrons. In order to do such a study one must first make certain basic assumptions about the type of interaction involved and then proceed to calculate physically meaningful qualities which describe the processes. Thus, the problem is this: assuming the validity of Feynman's rules for these strongly interacting particles, calculate the differential and total scattering cross sections for the interaction of scalar K+ mesons and neutrons.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130687/

### Carbon Contamination Measurements in Single Silicon Crystals

**Date:**December 1970

**Creator:**Logsdon, Lawrence E.

**Description:**The intent of this investigation was to directly measure the amount of carbon contamination in a single silicon crystal and, in so doing, develop a mathematical procedure that would be applicable to other contaminants in other substances.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc131331/

### The Classical Limit of Quantum Mechanics

**Date:**December 1977

**Creator:**Hefley, Velton Wade

**Description:**The Feynman path integral formulation of quantum mechanics is a path integral representation for a propagator or probability amplitude in going between two points in space-time. The wave function is expressed in terms of an integral equation from which the Schrodinger equation can be derived. On taking the limit h — 0, the method of stationary phase can be applied and Newton's second law of motion is obtained. Also, the condition the phase vanishes leads to the Hamilton - Jacobi equation. The secondary objective of this paper is to study ways of relating quantum mechanics and classical mechanics. The Ehrenfest theorem is applied to a particle in an electromagnetic field. Expressions are found which are the hermitian Lorentz force operator, the hermitian torque operator, and the hermitian power operator.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc504591/

### A Computer Analysis of Complex Gamma-Ray Spectra

**Date:**August 1965

**Creator:**Cunningham, William K.

**Description:**The purpose of this investigation was to provide a method for determining the relative intensities of all gamma rays in a particular spectrum, and thereby determine the relative transition probabilities.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130612/

### A Continuously Sensitive Cloud Chamber

**Date:**1951

**Creator:**Hughes, James E.

**Description:**A continuous cloud chamber would be a valuable asset to laboratory work in nuclear and atomic physics. For this reason the construction and investigation of a continuously sensitive diffusion cloud chamber has been undertaken. It is the purpose of this paper to report the design and operating characteristics of such a chamber.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc97019/

### A Correction Factor for the First Born Approximation

**Date:**January 1965

**Creator:**Russell, Jerry Brent

**Description:**This thesis looks at a Schroedinger equation and the Born approximation.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130574/

### Cross-Section at 15.6 and 16.1 MeV

**Date:**May 1969

**Creator:**Pepper, George H.

**Description:**The intent of this investigation is the determination of the values of the Cs-133 (n,2n)Cs-132 cross-section at neutron energies of 15.6 and 16.1 MeV. Neutrons of this energy are produced with comparative ease by means of the D-T reaction, in which deuterons of energy 500 and 750 keV, respectively, are impingent upon a tritium target.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc131110/

### Cross Section for the 165/Ho (n, 2n) 164/Ho Reaction at 15.6 MeV

**Date:**August 1969

**Creator:**Lear, Richard D.

**Description:**It was the purpose of this investigation to bring together the ideas and procedures involved in the measurement of (n, 2n) reaction cross sections. Some of the inherent properties of the material under investigation (Holium) are involved in determining these relationships.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc131148/

### Cross Section Measurements in Praseodymium-141 as a Function of Neutron Bombarding Energy

**Date:**May 1971

**Creator:**Marsh, Stephen Addison

**Description:**Using the parallel disk method of activation analysis, the (n,2n) reaction cross section in 141-Pr was measured as a function of neutron energy in the range 15.4 to 18.4 MeV. The bombarding neutrons were produced from the 3-T(d,n)4-He reaction, where the deuterons were accelerated by the 3-MV Van de Graff generator of the North Texas Regional Physics Laboratory in Denton, Texas.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc131376/

### Crystalline Polymorphism of Nitrates

**Date:**1951

**Creator:**Shepherd, Jimmie G.

**Description:**The purpose of this study was to investigate the polymorphism of a group of related compounds. Special emphasis was placed upon the temperature at which transitions occurred and a possible correlation of these temperatures with other properties of the compounds.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc97053/

### D-D and D-T Neutron Excitation of Energy Levels in Cs133

**Date:**January 1961

**Creator:**Dawson, Horace Ray

**Description:**The purpose of this experiment was to make positive assignment of the Cs133 energy levels excited by the inelastic scattering of neutrons.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130455/