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Fast Neutron Cross Sections: Corrections to LA-1714 and a Correlation of 3 Mev Values
Recent measurements on the long counter efficiency in which comparisons were made with the (n, p) scattering cross section, additional variations in efficiency were found which varied slowly with neutron energy but were still correlated with the total neutron cross section of carbon. Because of these variations in efficiency there are errors in the fission cross sections reported in LA-1714. Corrections to these data have been given here.
Date:
March 1, 1957
Creator:
Henkel, Richard L.
System:
The UNT Digital Library
Magnetic Field Distributions in a Pinched Discharge
By use of small magnetic probes inserted into the discharge, the magnetic field distributions in the interior of a high-power pinched discharge have been measured as a function of time. From these data the current distributions can be deduced. By applying a static pressure calculation, in the cases when the radical pinch accelerations are small, the plasma pressure nkT in the pinch has been determined, with superimposed axial magnetic fields, and for stable and unstable configurations.
Date:
November 20, 1956
Creator:
Burkhardt, L. C.; Lovberg, Ralph H. (Ralph Harvey) & Phillips, J. A.
System:
The UNT Digital Library
A Proposal For Reducing Impurities in a Stabilized Pinched Discharge
It is proposed to reduce the initial wall hangup and consequent plasma contamination of a stabilized pinched discharge by reducing the Bz pressure difference across the current sheath to nearly zero at early times. Two methods for accomplishing this are proposed, both involving multistage programming of the Bz system.
Date:
July 31, 1957
Creator:
Lovberg, Ralph H. (Ralph Harvey)
System:
The UNT Digital Library
Stability of a Linear Pinch With a Thick Boundary
The stability of a linear pinch is investigated by means of the "6W" formalism of E. A. Frieman. It turns out that when attention is confined to the surface layers of the plasma, convenient stability criteria can be deduced for very general cylindrically symmetric distributions of magnetic field and plasma.
Date:
August 1957
Creator:
Suydam, Bergen R.
System:
The UNT Digital Library
Welding of Plutonium
Delta-stabilized plutonium can be welded to itself or almost any other metal using the inert-gas metal-arc process. Equipment and procedures suitable for the welding of delta-stabilized plutonium under various conditions are described.
Date:
May 9, 1958
Creator:
Anderson, J. W.
System:
The UNT Digital Library
An Integral Experiment to Measure the Tritium Production From Li7 By 14 Mev Neutrons in a Lithium Deuteride Sphere
A sphere of LiD 2 feet in diameter was irradiated by 2 x 10<sup>15 14 Mev neutrons. Samples of Li<sup>7 metal were positioned at various radii for the irradiation. An analysis of these samples for tritium led to a determination of the number of tritons produced by 14 Mev neutrons acting on Li<sup>7 in a LiD system.
Date:
June 1958
Creator:
Wyman, Marvin Eugene, 1921-
System:
The UNT Digital Library
A Measurement of the [Lithium-7] Cross-Section for Several Neutron Energies From 4 to 15 Mev by Absolute Counting Techniques
A measurement of the [Lithium-7] reaction cross section by absolute counting of the tritium betas is described. The cross section was measured at several neutron energies between 4 Mev and 15 Mev. A comparison with results by emulsion techniques is given.
Date:
June 1958
Creator:
Wyman, Marvin Eugene, 1921- & Thorpe, Munson M.
System:
The UNT Digital Library
The Use of Quartz Tubes for Sampling and Casting Plutonium
The use of quartz tubing for sampling molten plutonium and for casting rods is described. These procedures offer cheap and easy-to-use methods for obtaining molten samples and for casting long rods with small diameters.
Date:
August 1958
Creator:
Johnson, K. W. R. & Anderson, J. W.
System:
The UNT Digital Library
Nuclear Propulsion Test Reactor Kiwi-A Neutronic Studies
Critical conditions were obtained for a series of uranium-graphite fueled assemblies in the C/Oy range 150 to 500 with thick graphite reflectors and Be or D2O islands. Perturbations were studied in order to find the effect on reactivity of geometrical changes and engineering features. Information from these studies was used to develop a mock-up of an optimum reactor geometry for the first rocket reactor test device, Kiwi-A. Studies on a zero power mock-up (Zepo-A) helped establish its design details. A cold critical check was made of the Kiwi-A reactor.
Date:
September 1958
Creator:
Orndoff, John D. & Hoogterp, J. C.
System:
The UNT Digital Library
The Injection Casting of Plutonium
Plutonium metal can be injected into cold metal molds to form castings with thin walls. The operation is performed in a vacuum chamber, using an inert gas as the injecting medium. Sound pieces free of gas cavities can be made using either pure or delta-stabilized plutonium. This report describes the equipment and techniques used to cast a typical thin section piece in the form of a 6 in. diameter, 45' cone.
Date:
January 1959
Creator:
Anderson, J. W.
System:
The UNT Digital Library
The Effect of Gallium on Plutonium Assay
Several of the plutonium assay methods were reexamined as part of a continuing effort to make improvements in these frequently used analyses. This investigation included a study of the controlled-potential coulometric, amperometric, potentiometric, and photometric titration methods and their applications to assays of delta-stabilized and alpha plutonium metal.
Date:
November 1962
Creator:
Bergstresser, K. S. (Karl Samuel), 1909-2004 & Waterbury, Glenn R.
System:
The UNT Digital Library
Uranium Hydrogeochemical and Stream Sediment Reconnaissance of the Lander NTMS Quadrangle, Wyoming, Including Concentrations of Forty-Three Additional Elements [Microfiche]
Report detailing uranium and other elemental data resulting from the Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) of 355 water and 1376 sediment samples collected from 1443 locations in the Lander National Topographic Map Series (NTMS) quadrangle, Wyoming, by the Los Alamos Scientific Laboratory.
Date:
September 1979
Creator:
Shannon, Spencer S.; Sandoval, Walter F.; Montoya, Janet D.; Minor, Michael M.; Simi, Oliver R.; Talcott, Carol L. et al.
System:
The UNT Digital Library