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Odd-Z Transactinide Compound Nucleus Reactions Including the Discovery of 260Bh

Description: Several reactions producing odd-Z transactinide compound nuclei were studiedwith the 88-Inch Cyclotron and the Berkeley Gas-Filled Separator at the LawrenceBerkeley National Laboratory. The goal was to produce the same compound nucleus ator near the same excitation energy with similar values of angular momentum via differentnuclear reactions. In doing so, it can be determined if there is a preference in entrancechannel, because under these experimental conditions the survival portion of Swiatec… more
Date: May 14, 2008
Creator: Nelson, Sarah L & Nelson, Sarah L
Partner: UNT Libraries Government Documents Department
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Study of Nuclear Reactions with 11C and 15O Radioactive Ion Beams

Description: Nuclear reaction study with radioactive ion beams is one of the most exciting research topics in modern nuclear physics. The development of radioactive ion beams has allowed nuclear scientists and engineers to explore many unknown exotic nuclei far from the valley of nuclear stability, and to further our understanding of the evolution of the universe. The recently developed radioactive ion beam facility at the Lawrence Berkeley National Laboratory's 88-inch cyclotron is denoted as BEARS and pro… more
Date: May 14, 2007
Creator: Lee, Dongwon
Partner: UNT Libraries Government Documents Department
open access

Small-Angle Neutron-Proton Scattering at 90 and 290 Mev

Description: From abstract: "The relative differential neutron-proton scattering cross section has been measured in the range of center-of-mass angles from 5.1° to 36.0° for approximately 90-Mev neutrons and from 10.7° to 37.8° for approximately 290-Mev neutrons."
Date: September 14, 1954
Creator: Easley, James Warren
Partner: UNT Libraries Government Documents Department
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Parametic Study of the current limit within a single driver-scaletransport beam line of an induction Linac for Heavy Ion Fusion

Description: The High Current Experiment (HCX) at Lawrence Berkeley National Laboratory is part of the US program that explores heavy-ion beam as the driver option for fusion energy production in an Inertial Fusion Energy (IFE) plant. The HCX is a beam transport experiment at a scale representative of the low-energy end of an induction linear accelerator driver. The primary mission of this experiment is to investigate aperture fill factors acceptable for the transport of space-charge-dominated heavy-ion bea… more
Date: February 14, 2007
Creator: Prost, Lionel Robert
Partner: UNT Libraries Government Documents Department
open access

SQUID-Detected MRI in the Limit of Zero Static Field

Description: This thesis describes an implementation of the so-called&quot;zero-field MRI&quot; (ZFMRI) pulse sequence, which allows for imaging in an arbitrarily low B<sub>0</sub> field. The ZFMRI sequence created an effective unidirectional gradient field by using a train of pi pulses to average out the concomitant gradient components during encoding. The signals were acquired using a low-transition temperature dc Superconducting QUantum Interference Device (low-Tc dc SQUID) coupled to a first-order axial… more
Date: December 14, 2009
Creator: Kelso, Nathan Dean
Partner: UNT Libraries Government Documents Department
open access

Scattering of K<sup>+</sup> Mesons Off Protons

Description: The total K/sup +/-p cross section was measured at the three K/sup +/- meson energies 175 er inch per 25, 225 er inch per 25, and 275 er inch per 25 Mev and the differential scattering cross section was measured at 225 Mev. The K/sup +/-p nuclear force was shown to be repulsive from the observed constructive interference with Coulomb scattering. The differential c=oss section was otherwise isotropic and could arise from either pure S-wave or pure P- wave scattering. Subtracted dispersion relati… more
Date: May 14, 1959
Creator: Kycia, Thaddeus F.
Partner: UNT Libraries Government Documents Department
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Diffusion in silicon isotope heterostructures

Description: The simultaneous diffusion of Si and the dopants B, P, and As has been studied by the use of a multilayer structure of isotopically enriched Si. This structure, consisting of 5 pairs of 120 nm thick natural Si and {sup 28}Si enriched layers, enables the observation of {sup 30}Si self-diffusion from the natural layers into the {sup 28}Si enriched layers, as well as dopant diffusion from an implanted source in an amorphous Si cap layer, via Secondary Ion Mass Spectrometry (SIMS). The dopant diffu… more
Date: May 14, 2004
Creator: Silvestri, Hughes Howland
Partner: UNT Libraries Government Documents Department
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An Experiment in School/Museum/University Collaboration

Description: A thesis submitted by Dr. Jack Davis, Dean and Professor, School of Visual Arts, University of North Texas, and Dr. William McCarter, Regents Professor of Art, School of Visual Arts, University of North Texas, titled "An Experiment in School/Museum/University Collaboration," January 14, 1994. The thesis describes the formation and work of the North Texas Institute for Educators on the Visual Arts, a consortia of six school districts, five museums, two arts councils, two state agencies and the U… more
Date: January 14, 1994
Creator: Davis, Donald Jack & McCarter, William, 1939-
Partner: UNT Libraries Special Collections
open access

Deformation and Fracture of Polycrystalline Lithium Fluoride

Description: Techniques for forming polycrystalline LiF from the melt and for fabricating test specimens were developed and evaluated using single-crystal LiF as a control. Large -grain polycrystalline specimens tested in fourpoint loading always showed some plastic deformation (0.078 to 0.798%) before fracture, but the plastic flow was sharpiy reduced from that of single crystals. An etch was developed revealing dislocations on all crystallographic faces of LiF. Details of plastic deformation in polycrysta… more
Date: September 14, 1962
Creator: Scott, W. D.
Partner: UNT Libraries Government Documents Department
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Scanning angle Raman spectroscopy: Investigation of Raman scatter enhancement techniques for chemical analysis

Description: This thesis outlines advancements in Raman scatter enhancement techniques by applying evanescent fields, standing-waves (waveguides) and surface enhancements to increase the generated mean square electric field, which is directly related to the intensity of Raman scattering. These techniques are accomplished by employing scanning angle Raman spectroscopy and surface enhanced Raman spectroscopy. A 1064 nm multichannel Raman spectrometer is discussed for chemical analysis of lignin. Extending dis… more
Date: March 14, 2013
Creator: Meyer, Matthew W.
Partner: UNT Libraries Government Documents Department
open access

Controlling atomistic processes on Pb films via quantum size effects and lattice rotation

Description: The two main techniques used to record the data in this dissertation were Spot Profile Analysis - Low Energy Electron Diffraction (SPA-LEED) and Scanning Tunneling Microscopy (STM). A specific data analysis technique for LEED data called G(S) curves is described in depth. G(S) curves can provide a great deal of structural information about the surface; including step heights, island size, and island separation. The effects of quantum size effects (QSE) on the diffusion and critical island sizes… more
Date: June 14, 2012
Creator: Binz, Steven
Partner: UNT Libraries Government Documents Department
open access

Electron-impact ionization of atomic hydrogen

Description: Since the invention of quantum mechanics, even the simplest example of collisional breakup in a system of charged particles, e{sup {minus}} + H {r_arrow} H{sup +} + e{sup {minus}} + e{sup {minus}}, has stood as one of the last unsolved fundamental problems in atomic physics. A complete solution requires calculating the energies and directions for a final state in which three charged particles are moving apart. Advances in the formal description of three-body breakup have yet to lead to a viable… more
Date: February 14, 2000
Creator: Baertschy, Mark D.
Partner: UNT Libraries Government Documents Department
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