27 Matching Results

Search Results

Results: 1 - 24 next
open access

An Ion Exchange Study of Possible Hydridized 5f Bonding in theActinides

Description: A study has been made of the elution behavior of curium(III), americium(III), plutonium(III), actinium(III), plutonium(IV), neptunium(IV), uraniuM(IV), thorium(IV), neptunium(V), plutonium (VI), uranium (VI), lanthanum(III), cerium(III), europium(III), ytterbium(III), ytterium(III), strontium(II), barium(II), radium(II), cesium(I) with 3.2 M, 6.2 M, 9.3 M, and 12.2 M HCl solutions from Dowex-50 cation exchange resin columns. These elutions show that in high concentrations of hydrochloric acid t… more
Date: August 28, 1951
Creator: Diamond, R. M.; Street, Jr., K. & Seaborg, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some Comments on the Mechanism of Fission

Description: A correlation of spontaneous fission rates with Z and A is made to show that these rates depend on the nuclear type. Some suggestions as to the mechanisms are given and it is also shown how these relate to the mechanism of slow neutron and photo fission.
Date: July 25, 1951
Creator: Seaborg, Glenn T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy Doubling in D.C. Accelerators

Description: It is generally believed that charged particles cannot be accelerated from ground potential to ground potential unless they pass through a system which has associated iwth it a time varying magnetic field. D.C. electric fields must satisfy the equation {contour_integral} Eds = 0, while the time varying fields used in radio-frequency accelerators and betatrons are freed from this restriction of scalar potential theory. In 1932, AJ Dempster produced protons with an energy of 45 Kev, by passing th… more
Date: April 20, 1951
Creator: Alvarez, Luis W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mass Spectrometer Studies of Ion Sources for One Shot AcceleratorTube

Description: A simple mass spectrometer using 60 degree focusing was set up to study the (illegible) of the ions produced by various types of sources. A schematic diagram of the apparatus is shown in Fig. 1, which is to a large extent self-explanatory. The isolation transformer was simply a piece of RG (illegible) cable about three feet long and was used in order to operate the source at high accelerating voltage allowing the collector to be at essentially ground potential. The collimating slits were 0.05 (… more
Date: December 12, 1951
Creator: Brumbaugh, R.; Pon, W.; Seaman, W. & Wiegand, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Carbon Dioxide Fixation by Microorganisms

Description: Resting cells of eleven microorganisms were exposed to radioactive carbon dioxide for 40 minutes. The radioactive compounds formed during this time were separated and identified by paper chromatography. Resting cells of Lactobacillus casei fixed no carbon dioxide and growing cells fixed carbon dioxide primarily in malic and aspartic acids. All of the radioactive compounds formed could have become radioactive by reversal of known decarboxylation reactions.
Date: July 24, 1951
Creator: Lynch, Victoria H. & Calvin, Melvin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Path of Carbon in Photosynthesis. XIV.

Description: It seems hardly necessary to repeat to an audience of this kind the importance of the process known as photosynthesis in the interaction and the interdependence of organisms and in the very existence of life as we know it. This process by which green plants are able to capture electromagnetic energy in the form of sunlight and transform it into stored chemical energy in the form of a wide variety of reduced (relative to carbon dioxide) carbon compounds provides the only major source of energy f… more
Date: June 30, 1951
Creator: Calvin, Melvin; Bassham, J. A.; Benson, A. A.; Kawaguchi, S.; Lynch, V. H.; Stepka, W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Energy Proton Spallation -- Fission of Uranium

Description: The fission and spallation reactions caused in uranium by bombardment with high energy protons (340 t o 350 MeV) were investigated. The reaction products were separated from the target by chemical processes and identified by their radioactive properties. The relative yields of the observed fission products were measured, and the results plotted as a function of mass number. Several of the spallation products were identified and their yields estimated. An attempt was made to determine the most p… more
Date: May 28, 1951
Creator: Folger, R. L.; Stevenson, P. C. & Seaborg, G. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Glass Still for the Evaluation of Column Packing With Uranium Hexafluoride

Description: The operating holdup and flooding rates of uranium hexafluoride, n-heptane, and perfluorodimethylcyclohexane have been studied in a glass still filled with 1/8 inch nickel Heli-Pak. The flooding rates of the latter two substances are 46.0 and 48.0 cc./min. respectively and the flooding rate for uranium hexafluoride, calculated from the Bertetti equation, is 42.9 cc./min. The operating holdups for these three substances on Heli-Pak were measured at several throughput rates up to the flooding rat… more
Date: July 1, 1951
Creator: McGill, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Slow Neutron Velocity Spectrometer Transmission Studies of Pu

Description: The slow neutron transmission of several samples of plutonium is being investigated with the Columbia Neutron Velocity Spectrometer. The spectrometer, which has been described previously (Rainwater et al., Phys. Rev. 71, 65 (1947)), was recently improved, recalibrated, and the operational factor reevaluated (CUD-59). Results reported here were obtained by the procedure described in that report.
Date: May 28, 1951
Creator: Havens, W. W., Jr.; Melkonian, E.; Rainwater, L. J. & Levin, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FURTHER RESULTS ON THE PRODUCTION OF NEUTRAL MESONS BY PHOTONS

Description: Further measurements have been made on the photoproduction of neutral mesons using the gamma-gamma coincidence technique. New data have been obtained on the gamma-gamma correlation curves in beryllium. The angular distribution of the photo mesons in Be has been determined and found to be strongly peaked forward. The dependence on the atomic number A of production has been found to obey an A{sup2/3} law. Some data obtained for production in hydrogen show that the pi-zero and pi-plus production c… more
Date: October 1, 1951
Creator: Panofsky, W.K.H.; Steinberger, J. & Steller, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THE THEORY OF QUANTIZED FIELDS. II

Description: The arguments leading to the formulation of the Action Principle for a general field are presented. In association with the complete reduction of all numerical matrices into symmetrical and anti-symmetrical parts, the general field is decomposed into two sets, which are identified with Bose-Einstein and Fermi-Dirac fields. The spin restriction on the two kinds of fields is inferred from the time reflection invariance requirement. The consistency of the theory is verified in terms of a criterion… more
Date: January 1, 1951
Creator: Schwinger, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NUCLEAR SHELL STRUCTURE AND $beta$-DECAY I. ODD A NUCLEI II. EVEN A NUCLEI

Description: A systematics is given of all transitions for odd A nuclei for which sufficiently reliable data are available. The allowed or forbidden characters of the transitions are correlated with the positions of the initial and final odd nucleon groups in the nuclear shell scheme. The nuclear shells show definite characteristics with respect to parity of the ground states. The latter is the same as the one obtained from known spins and magnetic moments in a one-particle interpretation.
Date: May 1, 1951
Creator: Mayer, M.G.; Moszkowski, S.A. & Nordheim, L.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Crystal Structure of Thorium and Zirconium Dihydrides by X-Ray and Neutron Diffraction

Description: Thorium forms a tetragonal lower hydride of composition ThH{sub 2}. The hydrides ThH{sub 2}, ThD{sub 2} and ZrD{sub 2} have been studied by neutron diffraction in order that hydrogen positions could be determined. The hydrides are isomorphous, and have a deformed fluorite structure. Metal-hydrogen distances in thorium hydride are unusually large, as in UH{sub 3}. Thorium and zirconium scattering amplitudes and a revised scattering amplitude for deuterium are reported.
Date: April 20, 1951
Creator: Rundle, R. E.; Shull, C. G. & Wollan, E. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Small Scale Preparation of c14 Labeled Succinic, Malic, Fumaricand Tartaric Acids

Description: The directions for preparing the following acids from labeled acetic acid on a 1 to 20 millimole scale is presented: Succinic acid, malic acid, fumaric acid and tartaric acid. Two methods for preparing the succinic acid are detailed.
Date: June 12, 1951
Creator: Jorgensen, E. C.; Bassham, J. A.; Calvin, M. & Tolbert, B. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen