# PHY Theses

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Item An experiment for the detection of parity nonconservation in beta decay(Wichita State University, 1960-06) East, Larry V.; Roys, Paul A.This work describes an experiment designed to detect parity nonconservation in low energy negaton beta decay. The method of detection utilizes scattering asymmetries to detect the presence of a preferred spin direction of the emitted beta electrons.Item An ultra-centrifuge for the measurement of adhesion and tensile strength(Wichita State University, 1960-08) Hill, Richard RoyAdhesion and tensile strength measurements may be made by spinning rotors plated with thin films until the centrifugal fields produced cause the films to fly off of the rotors. The construction of a vacuum ultra-centrifuge for producing high centrifugal fields and techniques of its use in the measurement of adhesion are discussed. Some preliminary results of measurements of adhesion between thin copper films and steel rotors are also included.Item Design and construction of apparatus for an advance undergraduate electron diffraction experiment(Wichita State University, 1960-06) Herrington, James R.; Roys, Paul A.The purpose of this thesis and the associated research and construction was to produce an electron diffraction apparatus for an undergraduate laboratory experiment. This apparatus was to be superior to existing equipment of the same type. The functioning of this apparatus had to be straight forward, as the student has limited time in which to observe the phenomenon. As a result the thin-film method was chosen. A high vacuum supply was constructed as supporting equipment for the apparatus. This will also be described in this paper.Item The magnetic vector potential, Klein-Gordon equation and Klein’s paradox in relativistic quantum mechanics(2007-05) Schaffer, David L.; Behrman, Elizabeth C.This thesis evaluates solutions to the Klein-Gordon equation with scalar and vector potentials in the Symmetric and Landau gauges. The solution for the Klein-Gordon equation in the Symmetric gauge does reproduce elements of the two dimensional quantum harmonic oscillator. The Landau gauge solution is used in the velocity selector situation where particles can have acceleration free motion for a selected velocity. The Klein Paradox for spin less particles is reviewed and its application to the Klein- Gordon equation shows that the vector potential can have an effect on particle pair production without the violation of conservation of momentum or energy, that this effect is to suppress the particle pair production associated with Klein’s paradox and that the suppressive effect can, under certain conditions, become strong enough to prevent particle pair production in Klein’s paradox when the scalar potential is otherwise many times what would be necessary to create Klein’s paradox particle pairs.Item Calculation of quantum entanglement using a genetic algorithm(2007-05) Lesniak, Joseph; Behrman, Elizabeth C.Quantum entanglement is a multifaceted property that has attracted much attention, since it is used as the basis for such applications as quantum cryptography, quantum teleportation, and quantum computing. The calculation of quantum entanglement therefore has gained importance. As systems that use entanglement have evolved, the calculation of entanglement has become much more complex. A general method was developed for the calculation of entanglement for n-qubit or n-qudit system, based on the relative entropy of entanglement, and using a genetic algorithm technique. The method was tested on a two qubit system, for which there are some known points, and compared to exact calculations using the entanglement of formation and to another approximate method based on a quantum neural network. Advantages and disadvantages of the method and future work are discussed