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Theoretical Study of a Source of Intermediate Energy Neutrons

Description: Abstract. An analysis is made of a proposal to obtain neutrons of 15-25 Kev energy by moderating fast neutrons in aluminum and then reflecting off titanium. The fluxes calculated do not significantly exceed those obtainable from a standard antimony-beryllium photoneutron source. Two appendices treat aspects of the transport of neutrons through a slab of finite thickness.
Date: January 7, 1954
Creator: Bludman, Sidney A.
Item Type: Refine your search to only Report
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Behavior, a Balanced Network of Chemical Transformations (Biokinetics)

Description: Abstract. While the concept of a biological system as a balanced network of chemical transformations is not a new one, experimental definition of specific systems has been lacking. This paper defines theoretically and experimentally a number of such networks and their behavior and response to some limited environmental changes.
Date: January 13, 1954
Creator: Bradley, D.F. & Calvin, M.
Item Type: Refine your search to only Report
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Theory of Alpha Decay of Spheroidal Nuclei

Description: Abstract. Various effects of spheroidal nuclear distortion on the alpha decay process are considered theoretically. Differential equations governing alpha decay in the region beyond the maximum nuclear radius are derived. They consist of ordinary radial Schrodinger equations for alpha decay to various nuclear states with the addition of quadrupole interaction terms coupling the various equations. The significance of wave amplitudes of various angular momentum alpha groups as Fourier components … more
Date: December 10, 1953
Creator: Rasmussen, John O., Jr.
Item Type: Refine your search to only Report
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Angular Distribution of 30.6 Mev Protons Elastically Scattered by Be, C, and Al

Description: The motivation for the measurement of the angular distribution of elastic scattering of medium energy protons and neutrons has been clearly presented by others. They have also listed the results obtained prior to their experiments at 31.5 Mev. This is a report on some results obtained with 30.6 Mev protons scattered from Be, C, and Al.
Date: November 1953
Creator: Wright, Byron T.
Item Type: Refine your search to only Report
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Convergence and Summability of Orthogonal Series

Description: Consider an orthogonal series [formula] where [formula] is an arbitrary orthonormal system for the interval (a, b) and [formula] is a sequence of real numbers. This report is a collection of theorems which give sufficient conditions for the convergence almost everywhere in (a, b) and summability a. e. in (a, b) of the above series.
Date: October 6, 1953
Creator: Killeen, John, 1925-
Item Type: Refine your search to only Report
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Pile Neutron Production Field Curves Calculated Using the UCRL Differential Analyzer

Description: A set of 69 pile yield curves for the production of plutonium, americium, and curium isotopes in a neutron flux of 5 x 10<sup>14 cm<sup>-2 sec<sup>-1 is given. The differential analyzer of the University of California Radiation Laboratory was used in obtaining the curves. The curves are given also on log-log plots for comparison.
Date: October 30, 1953
Creator: Barrett, R. J.; Killeen, John, 1925-; Rasmussen, J. O. & Thompson, Stanley Gerald, 1912-1976
Item Type: Refine your search to only Report
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The Bevatron 9.9-Mev Proton Linear Accelerator

Description: The Bevatron requires an intense source of high energy protons. The machine should accept monoenergetic protons for a duration of approximately 500 microseconds once every 6 seconds. To satisfy the requirements of small loss due to scattering by the gas in the accelerating chamber, a 9.9-Mev linear accelerator has been built and operated.
Date: July 1954
Creator: Cork, Bruce
Item Type: Refine your search to only Report
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Meson-Mass Measurements II - On the Measurement of the Masses of Charged Pions

Description: This paper describes the method developed and the results obtained in an extensive program of measurement of the masses of charged pions. Measurements were made of the total ranges in nuclear track emulsion and the momenta (obtained from the curving of the particle trajectory in the magnetic field of the 184-inch cyclotron) of pions and protons of nearly the same velocity.
Date: February 2, 1954
Creator: Smith, Frances M.
Item Type: Refine your search to only Report
open access

Orbital Electron Capture in the Heaviest Elements

Description: Certain isotopes in the region of the heaviest elements have been produced by cyclotron and pile bombardment techniques, and their nuclear decay properties have been investigated. The orbital electron capture decay of At210, At211, Np234, Np235, Pu234, Pu237, and Am242m has been studied and decay schemes have been proposed. In addition, the alpha spectra of Po211, At210, and At211 have been observed.
Date: September 1953
Creator: Hoff, Richard William
Item Type: Refine your search to only Report
open access

Passage of Electrons Through Matter

Description: One of the oldest properties of electrons is their emission of x-rays (discrete and continuous spectra) when impinging on matter. Cloud-chamber tracks show light ionization, and considerable multiple scattering, except for fast electrons. Tracks are long and range indefinite.
Date: September 9, 1953
Creator: Vaughan, Edward
Item Type: Refine your search to only Report
open access

The Distributions in Energy and in Number of Electrons and Photons in Cascade: Derived With Energy-Dependent Bremsstrahlung, Materialization, Collision Loss and Multiple Scattering

Description: Diffusion equations for a cascade shower which include an energy cutoff and energy parameters for each particle have not previously been studied. In this paper it is found that an inclusion of both permits collision loss to be represented as a discrete process by modifying the differential radiation cross section.
Date: September 17, 1953
Creator: Rankin, Bayard
Item Type: Refine your search to only Report
open access

A Criterion For Vacuum Sparking Designed to Include Both R. F. and D. C.

Description: An empirical relation is presented which represents a boundary between no vacuum sparking and possible vacuum sparking. Metal electrodes and r.f. or d.c. voltages are used. The criterion fits several orders of surface gradient, voltage, gap, and frequency. Current due to field emission is considered necessary for sparking but in addition, energetic particles are required to initiate a cascade process which increases the field emission currents to the point of sparking. An elementary cascade pro… more
Date: September 4, 1953
Creator: Kilpatrick, W. D.
Item Type: Refine your search to only Report
open access

Dependence of Positive Pion Production Cross Sections on Atomic Number at Low Energies

Description: A preliminary study of positive pion production from proton-nucleus collisions revealed that positive pion production cross sections agree more favorably with a Z 2/3 variation than with a variation proportional to the atomic number. A similar study on negative pion production has shown that negative pion yields from proton-nucleus collisions tend to vary in proportion to the number of neutrons in the nucleus. As a result an experiment was performed to investigate if there is a significant chan… more
Date: September 8, 1953
Creator: Sagane, Ryokichi, 1905-1969 & Dudziak, Walter F.
Item Type: Refine your search to only Report
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Separation of Iron and Cobalt on Synthetic Resin

Description: Recent studies on the separation of cobalt and nickel and on the behavior of iron in hydrochloric acid on Dowex-1 resin in relation to the selective adsorption of chloride complexes of these elements have suggested the use of resin for the separation of iron and cobalt.
Date: August 5, 1953
Creator: Helwig, Harold L.; Ashikawa, James K.; Clokie, Hugh & Smith, Elmer R.
Item Type: Refine your search to only Report
open access

Dynamics of Stagewise Extraction Columns

Description: A calculation method has been developed in order to correlate continuous-flow extraction results in mixer-settlers with rate data for batch experiments. This correlation utilizes dynamic extraction coefficients (E's) that are calculated from the rate data and the equilibrium extraction coefficients. The dynamic coefficients may then be used in stage-by-stage calculations, or their average values used in equations derived herein from the overall performance of center-fed columns.
Date: August 10, 1953
Creator: Hicks, T. E.; Rubin, B. & Vermeulen, Theodore
Item Type: Refine your search to only Report
open access

Stopping Power and Ion Density

Description: A "particle" of charge Ze moves with velocity v, mass M, energy [formula], through a "substance" of atomic number Zo, density N atoms/cm3. We have to consider the process of slowing down, and the nature of the trail of ions produced. Very slow particles are of little interest, as their range is very short. If Z is large, or if the particle is an electron, there are complications which we postpone. Thus, our considerations will apply particularly to protons, deuterons, o< -particles, and mesons.
Date: July 24, 1953
Creator: {{{name}}}
Item Type: Refine your search to only Report
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