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Spallation-Fission Competition in Heaviest Elements; HeliumIon-Induced Reactions in Uranium Isotopes

Description: A radiochemical study of fission and spallation products produced by bombardment of U{sup 233}, U{sup 235}, and U{sup 238} with 18-46 Mev helium ions has been made. As in the case of similar studies using isotopes of plutonium as targets, most of the reaction cross section is taken up by fission. Also, the pronounced increase of the total cross section for ({alpha},xn) reactions with increasing mass number of the target that was observed for plutonium targets is observed for uranium targets.
Date: November 1, 1957
Creator: Vandenbosch, R.; Thomas, T. D.; Vandenbosch, S. E.; Glass, R. A. & Seaborg, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Summary of the Spert-I, -II, and -III reactor facilities

Description: Report containing "[a] brief description and design data summary of each of the SPERT Reactor Facilities is presented. Engineering, operating, and physics data are tabulated for use as basic references" (p. 3)
Date: November 1, 1957
Creator: Montgomery, C. R.; Norberg, J. A. & Wilson, T. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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TECHNICAL PROGRESS REPORT. PART I. STUDY PROGRAM ON HIGH-SPEED COMPUTER. PART II. MATHEMATICAL METHODS. PART III. GENERAL RESEARCH. PART IV. ILLIAC USE AND OPERATION--GENERAL LABORATORY INFMATION

Description: Basic circuits used on high-speed eomputers are described and control studies discussed. A prograim has been initiated to study iterative methods for solving systems of linear equations. A new and promising method of minimizing a function of n variables has been found, and a method applicable to evaluating determinants, solving linear algebraic equations, inverting matrices, and determining characteristic equations without round-off error is being tested. The Illiac use and operation for the No… more
Date: November 1, 1957
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Free-free gaunt factors

Description: The hydrogenic (unscreened coulomb) free-free gaunt factors are computed for a wide range of initial energies and photon frequencies. In addition, an average over initial energies with the Maxwell-Boltzmann distribution is performed to give the temperatureaveraged gaunt factors for use in opacity calculations. These are presented as functions of Z/sup 2//kT and h nu /kT. The relation between these gaunt factors and the rate of bremsstrahlung energy production is given, as is the total energy em… more
Date: November 1, 1957
Creator: Karzas, W. J. & Latter, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CHANGE IN CRITICAL CONCENTRATION IN A CYLINDRICAL REACTOR DUE TO A LONGITUDINAL HOLE

Description: The change in critical concentration due to axial holes of various diameters in a right circular cylinder containing D/sub 2/O and pure U/sup 233/ or U/sup 235/ is discussed. This geometry is intended to represent an aqueous homogeneous reactor with a central void due to rotating flow of the fluid through the core. The critical equations and results of calculations are given. (M.H.R.)
Date: November 1, 1957
Creator: Tobias, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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AN ESTIMATE OF THE NONLEAKAGE PROBABILITY FOR BARE AQUEOUS HOMOGENEOUS U$sup 235$ REACTORS

Description: The slowing-down distribution, to thermal energy, of neutrons from a U/ sup 235/ fission source in an infinite H/sub 2/O medium up to 160 cm was determined from experimental data. The Fourier transform of this distribution and the In resonance distribution, which are the nonleakage probabilities for bare reactors, were also determined. (auth)
Date: November 1, 1957
Creator: Trubey, D.K.; Moran, H.S. & Weinberg, A.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The EBR-I Meltdown--Physical and Metallurgical Changes in the Core. Final Report--Metallurgy Program 7.2.18

Description: As a result of the partial meltdown which occurred in EBR-1 on November 29, 1955, it was necessary to remove the core assembly from the reactor and to separate the enriched fuel section from upper and lower unenriched blanket sections. A temporary cave was constructed on top of the reactor in order to remove the core assembly, and at this time about one-fourth of the fuel elements were removed. In order to perform further disassembly operations under less hazardous conditions, the core assembly… more
Date: November 1, 1957
Creator: Kittel, J. H.; Novick, M. & Buchanan, R. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Disintegration of Helium by 300-Mev Neutrons

Description: An investigation of the inelastic and elastic reactions between high- energy neutrons nnd He nuclei was conducted with a cloud chamber filled with He and operating in a pulsed magnetic field of 21,700 gauss. Neutrons produced by bombardment of a 1/2-in. LiD target with 340-Mev protons in the 184-in. synchrocyclotron were collimated and passed through the 22-inch expansion cloud chamber, which was filled with He gas to a total pressure of 89.8 cm Hg. Exclusive of meson-producing reactions, the p… more
Date: November 1, 1957
Creator: Innes, William H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

A Study of Core Fuel Systems for a Fast Breeder Power Reactor

Description: The first phase of a program aimed toward the development of materials and a core-subassembly design for the second core of the Fermi Reactor is outlined. The ground rules established by APDA for the study were based upon the performance requirements of the reactor plant with some modification to permit hlgher power generation and upon a value of Pu produced of about per g. Consideratlons of various factors led to the selection of the dispersion or cermet fuel as havlng the most potential for t… more
Date: November 1, 1957
Creator: Fawcett, S.L. ed.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Uranium Recovery, Uranium Geochemistry, Thermoluminescence and Related Studies. Final Report

Description: The recovery of urantum at the mine with portable equipment was shown to be feasible, using a process which involves grinding the ore, leaching with nitric acid, extracting with tributyl phosphate and kerosene, and precipitation with ammonia gas. The system is more expensive than a stationary plant but couid be used in an emergency or in difficulty accessible locations. The distribution of uranium was studied in various geographical locations and in several different materials including limesto… more
Date: November 1, 1957
Creator: Daniels, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A LITERATURE SURVEY ON THE APPLICABILITY OF STEADY-STATE HEAT-TRANSFER COEFFICIENTS TO TRANSIENTS IN POWER OR IN FLOW WITH SINGLE-PHASE FLOW AND WITH TWO-PHASE FLOW

Description: A survey of all the known literature on the subject is presented. This survey consists of four parts amd two appendices, namely: response of single- phase-fluid forced-convection heat transfer to a rapid change of velocity, response of single-phase-fluid forced-convection heat transfer to a rapid change of temperature of the surface or of the incoming fluid, response of single- phasefluid free-convection heat transfer to a rapid change of the surface temperature or of the heat flux through the … more
Date: November 1, 1957
Creator: Norris, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PULSE PUMPING: A MEANS FOR TRANSFER OF PULSE COLUMN FLUIDS

Description: ABS>A pulse pump, which uses the energy of the pulser to pump fluids to or from a pulsed solvent extraction column, was steady in operation, and results were reproducible. Performance was satfsfactory with 2- and 12-in.-diam concatenated columns and with a 5-in.-diam straight column. (auth)
Date: November 1, 1957
Creator: Irvine, A.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nuclear Chemical Research Radiochemical Separations and Activation Analysis. Progress Report No. 6 for November 1956-October 1957. Dept. Of Chemistry

Description: The present facilities at the University of Michigan for research in nuclear chemistry are described. The determination of the cross sections of various (d, alpha ) reactions induced by thc 7.78 plus or minus 0.05 Mev deuterons from the Unlversity of Michigan cyclotron is presented. The work on the absolute (d, alpha ) reaction cross sections has been simed at surveying the reaction yields as a function of atomic number with the hope of establishlng the presence or absence of closed shell effec… more
Date: November 1, 1957
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Progress Relating to Civilian Applications During October 1957

Description: BS>The creep properties of annealed Zircaloy-2, Zircaloy3, and 15% cold- worked Zircaloy-2 at elevated temperatures were determined. The metallurgical bond formed between electropolished U and Zr cladding by hydrostatic pressing is being evaluated. Oxidation data are given for Nb and Nb alloys in dry air at various temperatures. A study of the phase relationships which occur between the delta phases of the U--Zr and U--Mo systems is nearly complete. The solid-solid reactions of some uranium nit… more
Date: November 1, 1957
Creator: Dayton, R.W. & Tipton, C.R. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

LONGITUDINAL DISPERSION IN SOLVENT-EXTRACTION COLUMNS: PECLET NUMBERS FOR ORDERED AND RANDOM PACKINGS

Description: Dispersion phenomena in packed beds in both axial and radial directions were studied to provide basic data for extraction-tower design. Nine different beds were used, involving regular and random arrangements of spheres, and random arrangements of Raschig rings and Intalox saddles. For one-phase flow a wide range of Reynolds numbers was used (5 to 2000), covering regions of laminar, transition, and turbulent flow. For the axial Peclet number, different constant values were found in the turbulen… more
Date: November 1, 1957
Creator: Jacques, G.L. & Vermuelen, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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