UNT Libraries - 11 Matching Results

Search Results

Results: 1 - 11
open access

Cross-Section at 15.6 and 16.1 MeV

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.
Date: May 1969
Creator: Pepper, George H.
open access

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

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.
Date: August 1969
Creator: Lear, Richard D.
open access

Gamma Ray Distribution from Neutron Excitation in Cesium

Description: The purpose of this investigation was to analyze the gamma rays resulting from excitation of Cs133 by the inelastic scattering of 14 MeV neutrons and to determine the relative intensity of each gamma ray.
Date: January 1969
Creator: Bowers, Richard Morgan
open access

Magnetomorphic Oscillations in Cadmium Cylinders

Description: The work presented here is an experimental investigation of the effect of cylindrical geometry on electrical conductivity, in which single-crystal samples of cadmium at the temperature of liquid helium are used, with the diameter on the order of the electron mean free path.
Date: August 1969
Creator: Hight, Ralph D.
open access

Microwave Cavity Method for Measuring Plasma Properties

Description: This discussion is concerned primarily with communications blackout during spacecraft entry into a planetary atmosphere. The gas in the shock layer, between shock wave and vehicle surface, ionizes from the intense heating which takes place in the bow shock wave and a viscous region of high gas enthalpy. This ionization may persist throughout the subsequent flow over the vehicle and into the wake, thus completely engulfing the vehicle and its communications elements. The problem will be to simul… more
Date: August 1969
Creator: Freeman, Ronald H.
open access

Monte Carlo Calculations of Reflected Intensities for Real Spherical Atmospheres

Description: To calculate the emergent radiation field, a realistic atmospheric model and algorithm must be developed. The radiation field may be characterized by the emergent intensities of scattered light. This is possible only if the algorithm determines these intensities as dependent upon atmospheric and angular parameters.
Date: January 1969
Creator: Montgomery, John A.
open access

Recombination Rate Coefficient Measurements in the Helium Afterglow

Description: This thesis describes a method of determining the recombination rate coefficient experimentally, which does not depend on a specific model of the recombination process. With this method established, results are presented for the recombination rate coefficient measurements at 44.6 Torr.
Date: August 1969
Creator: Wells, William E.
open access

Size Dependence in the Electrical Conductivity of Bismuth

Description: In the present investigation, measurements were made at liquid-helium temperatures on single-crystal bismuth samples which had a stair-step geometry in order to study several thicknesses during one helium run. These samples were also thinned to extend the thickness range of the steps to a thinner region. In addition J.E. Parrott's theory is extended to include a diagonal anisotropic relaxation-time tensor and the effect of holes on the size effect. A discussion of the theory of Parrott, and the… more
Date: August 1969
Creator: Granstaff, Shelie M.
open access

Temperature Dependence of Line Widths of the Inversion Spectra of Ammonia

Description: One of the purposes of this work is to investigate modifications that have to be made to a standard source-modulation microwave spectrograph so that it can be used to study gases at various temperatures. Another objective in this work is to determine experimentally the function of temperature that describes how the line widths of microwave spectral lines vary with changing temperature. The most important segment of the study is the temperature dependence of the line width since from an accura… more
Date: August 1969
Creator: Cook, Charles E.
Back to Top of Screen