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NUMERICAL ANALYSIS OF NEUTRON RESONANCES

Description: Neutron resonances are analyzed numerically by determining the resonant energies, the total widths, and the neutron widths of the resonances. It was assumed that the total cross section can be represented by the sum of single- level Breit-Wigner formulas, with interference between resonance and potential scattering but no interference between resonances; that the Doppler broadening is represented by a Gaussian function; and that the instrument resolution is represented by a Gaussian function. Gauss' method was used to reduce the nonlinear problem to one in which linear methods can be applied. Some unusual techniques were used for evaluating the integrals in the function for calculating the transmission. Two programs for analyzing transmission data to obtain the parameters of the resonances were written for the IBM 7090 computer. The first program is a shape analysis for determining the resonant energies, the total widths, and the neutron widths of the resonances. This program analyzes the transmission data for as many as six resonances at once. The second program is an area analysis for determining the neutron widths of the resonances for assumed total widths. This program analyzes transmission data containing as many as 20 resonances at once. (auth)
Date: January 10, 1962
Creator: Atta, S.E. & Harvey, J.A.
Partner: UNT Libraries Government Documents Department

STANDARD CLEARANCE HOLE SIZES

Description: Reprinted with revisions from SCTM-133-56(16). Abridged version published in Prod. Eng. May 12, 1958. This study establishes standard clearance hole sizes for the common screw fastener sizes, positional tolerances and assembly applications. These clearance hole sizes are expressed as standard drill sizes in the tables. In arriving at these drill sizes, consideration was given to the fact that drills cut oversize and that deviations in the size of drilled holes must be expected even under ideal operating conditions. (auth)
Date: June 1, 1958
Creator: Millard, C I
Partner: UNT Libraries Government Documents Department

PHYSICS DIVISION SUMMARY REPORT, JUNE 1963. Annual Review

Description: Research progress in experimental and theoretical nuclear physics, theoretical high-energy physics, and extranuclear properties of matter is summarized. Accelerator operations and irnprovements are reported, and a list of publications is included. Separate abstracts have been prepared for the nine sections of the report. (D.C.W.)
Date: October 31, 1963
Partner: UNT Libraries Government Documents Department

PHYSICS DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING FEBRUARY 10, 1961

Description: Results are discussed for investigations of: elastic scattering of bound nuclei; center-of-mass energy in Overhauser's self-consistent field with giant density fluctuations; the distorted-wave theory of direct nuclear reactions; an excitation method for an optical maser; energy spectra for BETA decay of He/sup 6/; electron shake-off following He/sup 6/ decay; neutrons from He/sup 3/ bombardment of Be/sup 9/, Ci/sup 1//sup 3/, and Li/sup 7/; total neutron cross section of Pb/sup 2//sup 0//sup 8/; neutron total cross sections for selenium isotopes at 4 to 50 kev; statistical parameters of nuclei from kev neutron total and capture cross sections; high-resolution total neutron cross sections of Am/ sup 2//sup 4//sup 1/ and Np/sup 2//sup 3//sup 7/; Breit-Wigner resonances; neutron radiative capture at 200 to 6000 ev; gamma spectra from 30-kev neutron capture; gamma - gamma angular correlations in Xe/sup 1//sup 3//sup 2/; Coulomb excitation of levels in Se/sup 7//sup 7/; Mossbauer method of HFS splitting of Au/ sup 1//sup 9//sup 7/ alloys wlth iron, cobalt, and nickel; magnetic ordering in rare-earth intermetallic compounds; frequency calibrations of prism spectrometers and spectral slit-width measurements; vapor-phase infrared absorption spectra of HfF/sub 4/, TiF/sub 4/, and ZrF/sub 4/; polarized deuteron sources; pulse characteristics of fast phototubes; properties of semiconductor detectors; and the response of silicon detectors to fission fragments. (B.O.G.)
Date: May 1, 1961
Partner: UNT Libraries Government Documents Department

Physics Division Quarterly Report : November, December 1953, January 1954

Description: The following report is a quarterly report done by the Physics Division of the University of California's Radiation Laboratory, covering the period of November and December of 1953, and January of 1954. This report discusses general physics research and the development and operation of the accelerator.
Date: March 11, 1954
Creator: University of California. Radiation Laboratory. Physics Division.
Partner: UNT Libraries Government Documents Department