Latest content added for UNT Digital Library Collection: UNT Theses and Dissertationshttp://digital.library.unt.edu/explore/collections/UNTETD/browse/?fq=untl_institution:UNT&fq=str_degree_department:Department+of+Physics&fq=untl_decade:1950-19592013-06-04T22:29:06-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Collection: UNT Theses and DissertationsDesign and Testing of a Positive Ion Accelerator and Necessary Vacuum System2013-06-04T22:29:06-05:00http://digital.library.unt.edu/ark:/67531/metadc163830/<p><a href="/ark:/67531/metadc163830/"><img alt="Design and Testing of a Positive Ion Accelerator and Necessary Vacuum System" title="Design and Testing of a Positive Ion Accelerator and Necessary Vacuum System" src="/ark:/67531/metadc163830/thumbnail/"/></a></p><p>This thesis is a study of the design and testing of a positive ion accelerator and necessary vacuum system.</p>Variational Wave Function for Sodium2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130344/<p><a href="/ark:/67531/metadc130344/"><img alt="Variational Wave Function for Sodium" title="Variational Wave Function for Sodium" src="/ark:/67531/metadc130344/thumbnail/"/></a></p><p>The practical method of applying the variation principle to the calculation of the energy of an atom demands a trial function which contains variable parameters. The previous work done using this approach was based on the use of some combination of hydrogenic wave functions containing parameters inserted in appropriate places. The present calculation of the energy of the eleven-electron atom has been brought about using this method.</p>Operation and Control of a Radiofrequency Ion Source2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130340/<p><a href="/ark:/67531/metadc130340/"><img alt="Operation and Control of a Radiofrequency Ion Source" title="Operation and Control of a Radiofrequency Ion Source" src="/ark:/67531/metadc130340/thumbnail/"/></a></p><p>This thesis examines the operation and control of a radiofrequency ion source.</p>Neutron Density Depression Due to an Oblate Spheroidal Detector2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130362/<p><a href="/ark:/67531/metadc130362/"><img alt="Neutron Density Depression Due to an Oblate Spheroidal Detector" title="Neutron Density Depression Due to an Oblate Spheroidal Detector" src="/ark:/67531/metadc130362/thumbnail/"/></a></p><p>In this paper, two projects have been undertaken. First, Workman's calculations have been checked to a higher degree of approximation to determine the accuracy of his method. Second, a new set of boundary conditions has been developed for obtaining solutions of the neutron diffusion equation which do not depend on the solution of the equation inside the detector.</p>A Determination of the Bothe Depression Factor for Discs in Water2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130255/<p><a href="/ark:/67531/metadc130255/"><img alt="A Determination of the Bothe Depression Factor for Discs in Water" title="A Determination of the Bothe Depression Factor for Discs in Water" src="/ark:/67531/metadc130255/thumbnail/"/></a></p><p>The purpose of this work is to determine experimentally the depression of the neutron density by a detecting foil. The depression factor is known as the "self-shading" of the foil.</p>Analyzing Magnet System for the Electrostatic Accelerator2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130409/<p><a href="/ark:/67531/metadc130409/"><img alt="Analyzing Magnet System for the Electrostatic Accelerator" title="Analyzing Magnet System for the Electrostatic Accelerator" src="/ark:/67531/metadc130409/thumbnail/"/></a></p><p>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.</p>A Method for Calculating Foil Depression Factors2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130315/<p><a href="/ark:/67531/metadc130315/"><img alt="A Method for Calculating Foil Depression Factors" title="A Method for Calculating Foil Depression Factors" src="/ark:/67531/metadc130315/thumbnail/"/></a></p><p>As disc-shaped detectors are one of the primary means of measuring the neutron density, a better solution is desirable if the error due to the depression factor is to be made negligible. In this paper, an attempt is made to solve this problem in the oblate spheroidal co-ordinate system which most nearly describes the disc-shaped detector, so that solutions may be obtained that describe depression factors for detectors of varying thicknesses and radii.</p>Foil Depression Factors for Disc-shaped Detectors2012-12-27T22:03:54-06:00http://digital.library.unt.edu/ark:/67531/metadc130367/<p><a href="/ark:/67531/metadc130367/"><img alt="Foil Depression Factors for Disc-shaped Detectors" title="Foil Depression Factors for Disc-shaped Detectors" src="/ark:/67531/metadc130367/thumbnail/"/></a></p><p>The generalized data which are presented in this thesis are the culmination of the determination of the foil depression factor using oblate spheroidal coordinates.</p>Gamma Ray Response of a CsI(T1) Crystal to 14 Mev Neutrons2012-10-12T10:26:10-05:00http://digital.library.unt.edu/ark:/67531/metadc108020/<p><a href="/ark:/67531/metadc108020/"><img alt="Gamma Ray Response of a CsI(T1) Crystal to 14 Mev Neutrons" title="Gamma Ray Response of a CsI(T1) Crystal to 14 Mev Neutrons" src="/ark:/67531/metadc108020/thumbnail/"/></a></p><p>The purpose of this paper is to study the possible excited states in the nucleus of Cs133. At North Texas State College a 100-Kev Cockcroft-Walton accelerator has been constructed for use as a neutron source for exciting various nuclei and for studying the gamma spectra obtained to determine their energy levels.</p>Gamma Rays from Neutron Excitation of Cs1332012-10-12T10:26:10-05:00http://digital.library.unt.edu/ark:/67531/metadc108026/<p><a href="/ark:/67531/metadc108026/"><img alt="Gamma Rays from Neutron Excitation of Cs133" title="Gamma Rays from Neutron Excitation of Cs133" src="/ark:/67531/metadc108026/thumbnail/"/></a></p><p>This thesis explores gamma rays from neutron excitation of Cs133.</p>