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Summary of the Research Progress Meeting June 17, 1948

Description: This summary of the research progress meeting on June 17, 1948 discusses the following topics: (1) Potassium 43 (R. Overstreet); (2) Recoils (A. Ghiorso); (3) M.I.T. accelerator conference (W. Panofsky); and (4) Cosmic rays (Prof. Louis Le prince - Ringuet, France)
Date: June 17, 1948
Creator: Folden, Margaret Foss
Partner: UNT Libraries Government Documents Department

Summary of the Research Progress Meeting June 24, 1948

Description: This summary of the research progress meeting on June 24, 1948 discusses the following topics: (1) Spectrographic analysis of alpha active materials (J. Conway); and (2) Range energy determinations (Dr. R.L. Thornton, Mr. Walter Stephan and Mr. Walter Aron).
Date: June 24, 1948
Creator: Wakerling, R. K. (Raymond Kornelious), 1914-
Partner: UNT Libraries Government Documents Department

Magnetic Field Measurements by Nuclear Resonance

Description: Abstract: The purpose of this report is to outline the work done at the Radiation Laboratory toward the development of a magnetic field measuring device using the phenomenon of nuclear resonance. While the work described here is far from complete, it has served to indicate the limitations of the method as well as some of its possibilities. For reasons which will become apparent, the project is being discontinued. It is hoped that this report will serve as a starting point should the work be continued at some later time and that some of the mistakes already made need not be repeated.
Date: August 20, 1948
Creator: Kafitz, Peter
Partner: UNT Libraries Government Documents Department

Species of Uranium(VI) with TTA in Benzene and Perchloric Acid, the Charge on Uranyl Ion

Description: Abstract: Part I: A series of extraction experiments has been performed to determine the distribution coefficient of uranium(VI) between dilute perchloric acid and benzene solutions of TTA. The data are interpreted to show that the principal species in the acid phase is a doubly charged ion, UO2++. The discrepancies revealed in previous work(1) were not found. Part II: The spectrophotometric method of analysis developed for use in Part I has shown the existence of previously unreported species of uranium(VI) in the presence of TTA: UO2K2-HK in benzene, and UO2K+ in dilute acid. The absorption spectra of all the principal species are reported.
Date: September 1948
Creator: Orr, William C.
Partner: UNT Libraries Government Documents Department

Paramagnetic Susceptibilities and Electronic Structures of Aqueous Cations of Elements 92 to 95

Description: Abstract: Magnetic susceptibilities per gram atomic weight of elements 92 to 95 in most of their oxidation states were measured at 20°C on 0.1 ml of solution which was 0.005 to 0.09M in heavy element. The values obtained (all paramagnetic) in units × 106 were: U(IV), 3690; Np(VI), 2060; Np(V), 4120; Np(IV), 4000; Pu(IV), 1610; Pu(III), 370; Am(III), 720. The results could be interpreted only on the basis of electronic configurations 5fn, even though susceptibilities were generally lower than the theoretical values and lower than experimental values for corresponding lanthanide 4fn cations. The lower values should be expected as a result of the Stark effect produced by electric fields of anions and of water dipoles. Failure of the Russell‐Saunders approximation to the coupling between electrons may account for some of the error in the theoretical calculations. That the susceptibilities of Pu(III) and Am(III) are manyfold lower than those of Sm(III) and Eu(III), respectively, is attributed to wider multiplet splitting in the actinide atoms.
Date: November 12, 1948
Creator: Howland, Jerome J. & Calvin, Melvin, 1911-1997
Partner: UNT Libraries Government Documents Department

The Activity Coefficient of Plutonium(IV) Salts in Acidic Solutions

Description: Summary: The activity coefficient of Pu(Cl04)4 was measured in perchloric acid solutions. The procedure used was to measure the extraction of the neutral plutonium(IV)-TTA chelate into benzene-TTA solutions at different perchloric acid concentrations. Equations are presented which show the relation of the extraction coefficients, obtained in the above manner, to the activity coefficient of plutonium(IV) per-chlorate. The activity coefficient of Pu(Cl0~)4 is similar to that of a strong acid, e.g., perchloric acid, in that its value increases rapidly when the perchloric acid concentration becomes greater than 2M. The distribution coefficient of TTA between benzene and aqueous perchloric acid solutions was found first to decrease slightly and then to increase two fold as the perchloric acid was varied from 0.01 to 6M. The activity coefficient of the uranous-TTA chelate in benzene was calculated from the results of solubility measurements. The values of the activity coefficient of UK4 are,within experimental error, identical with the values of the activity coefficient of TTA itself.
Date: November 1948
Creator: Connick, R. E. & Reas, W. H.
Partner: UNT Libraries Government Documents Department

Chemistry Division Quarterly Report: September, October and November, 1948

Description: A quarterly report consisting of reports published on Transuranic Elements from the University of California Radiation Laboratory. Each report is a brief one to two page summaries of the article submitted for publication during the months of September-November, 1948.
Date: September 1948
Creator: Lawrence Radiation Laboratory
Partner: UNT Libraries Government Documents Department

The Chelate Process: [Part] 5. Investigation in Horizontal Extractors

Description: The recovery of plutonium has been demonstrated in a laboratory countercurrent horizontal extractor using the TTA process. Using three extractive stages and two washing stages in each step, a recovery of 91 percent has been obtained in the chelation step and a recovery of 99.9+ percent in the de-chelation step. With five extractive stages, recoveries of 94-98 percent have been found for the chelation step.
Date: July 29, 1949
Creator: Hicks, T. E.; Rubin, B. & Vermeulen, T.
Partner: UNT Libraries Government Documents Department

Summary of the Research Progress Meeting of September 1, 1949

Description: The absolute excitation functions for the production of fission by charged particle bombardment in several substances were investigated at both high and low energies. The low energy work was done at the 60-inch Crocker cyclotron with alpha particles and deuterons, while the high energy work was done at the 184-inch cyclotron with alpha particles, deuterons, and protons.
Date: October 13, 1949
Creator: Wakerling, R. K. (Raymond Kornelious), 1914-
Partner: UNT Libraries Government Documents Department

Procedures in Magnetic Measurements at the University of California Radiation Laboratory, Berkeley: Fields Which are Constant or Vary Slowly with Time

Description: The flux standard is a device which will give a known flux-linkage change to be used as a calibration. At the Radiation Laboratory, two types of flux standards are used, a stationary type and a portable type.
Date: August 16, 1949
Creator: Richardson, Robert E.
Partner: UNT Libraries Government Documents Department

Use of the Characteristics of Permalloy in Detecting a Predetermined Value of Magnetic Field or Current in a Time-Varying Electromagnet: 1/4 Scale Bevatron Operating Model, Magnetic Field Strength-Magnet Current Correspondence

Description: In programming the sequence of events in the operational cycle of the bevatron, certain devices must be triggered at specific values of magnetic field strength in the gap. It is desirable that the time-jitter, which corresponds to field jitter, of the tirggering pulses be small. In the synchrotron this is done with peaking strips which are located in the fringing field of the gap.
Date: March 24, 1949
Creator: Richardson, R. E.; Shuey, R. L.; Younkin, R. & Stephan, W. J.
Partner: UNT Libraries Government Documents Department

The Distribution of the Positive-Negative Ratio for Mesons

Description: Positive and negative mesons produced in a common target in the cyclotron are received in two photographic plates. In the magnetic field of the cyclotron, negatives are deflected to one plate, positives to the other. The mesons must pass through an absorber before entering the plates in order to be observable.
Date: December 14, 1949
Creator: Rankin, Bayard, 1924-
Partner: UNT Libraries Government Documents Department

Production of Pi-Mesons in Lead by High Energy Proton Bombardment

Description: Our knowledge of the properties of mesons and their interactions with nuclei has come from two sources. Studies of cosmic ray phenomena provided the earliest information. The discovery that mesons may be produced artificially by bombardment of nuclei with radiations from high energy accelerators has, on the other hand, made it feasible to undertake a wide variety of investigations under more controlled conditions than is possible in cosmic ray experiments. In such experiments mesons have been produced by high-energy protons, alpha-particles and neutrons.
Date: January 10, 1950
Creator: Weissbluth, Mitchel
Partner: UNT Libraries Government Documents Department

Studies in Beta and Gamma Ray Spectroscopy

Description: The study of artificial radioactive isotopes is at the present time one of the most important topics in nuclear research. It involves the establishment of a detailed term scheme for the disintegration in question. Not only are the energies of the components of the different beta and gamma radiations of interest, but also their intensities. These data give information concerning the probabilities of transitions between the different nuclear energy levels. From them it is possible to draw conclusions regarding the mechanism of the disintegration and to correlate the spina and parities of the levels.
Date: January 26, 1950
Creator: Hayward, Raymond Webster, Jr.
Partner: UNT Libraries Government Documents Department

The Higher Fluorides of Plutonium

Description: A systematic set of thermodynamic data for most of the known compounds of plutonium is presented. From earlier data present, it is now possible to extend the tabulation of data for the compounds of plutonium to include PuF(4), PuF(5), and PuF(6).
Date: March 20, 1950
Creator: Brewer, Leo, 1919-2005; Bromley, LeRoy A.; Gilles, Paul W. & Lofgren, Norman L.
Partner: UNT Libraries Government Documents Department

The Scattering of 31.8 Mev Protons by Protons Using Proportional Counter Detectors

Description: The basic experiment consists of causing a beam of protons to impinge upon an accumulation of relatively stationary protons (hydrogen gas) and to measure the number of protons scattered as a function of the scattering angle. A description of the arrangement and alignment of equipment with the 32-Mev beam of the Berkeley linear accelerator is included. The data have been analyzed statistically and results have been indicated.
Date: 1950
Creator: Johnston, Lawrence Harding
Partner: UNT Libraries Government Documents Department

Radioactive Isotopes of Bismuth

Description: Five isotopes of bismuth occur in nature. Using particle accelerators providing helium ions up to 40 Mev in energy and deuterons up to 20 Mev in energy, it was possible to produce and identify two artificial radioactive isotopes. With the advent of the 184-inch Berkeley syncho-cyclotron and its hundreds of Mev energies, it was possible to form highly neutron-deficient bismuth isotopes extending more than ten mass units below stable Bi(209).
Date: April 6, 1950
Creator: Neumann, H. M.
Partner: UNT Libraries Government Documents Department

The Use of Laboratory High Frequency Induction Furnaces

Description: Equations are derived for the rates of heating of objects in induction furnaces and for the maximum temperatures attainable. The equations are primarily useful in designing conducting crucibles, shells, and cylinders so as to increase the power input and decrease heat losses. A very brief treatment is given of the factors which influence the current in the induction coil. The performances of various induction furnaces are compared.
Date: April 3, 1950
Creator: Brewer, Leo, 1919-2005
Partner: UNT Libraries Government Documents Department

Present Status of the Bevatron R. F. System

Description: The general method of controlling the radio frequency for the full scale Bevatron will be the same as that used on the 1/4 scale machine. The details of course will be modified to meet the requirements of greater range, higher output voltage and closer tracking tolerances. In addition, there is the added complication introduced by the current ripple.
Date: April 26, 1950
Creator: Riedel, J.
Partner: UNT Libraries Government Documents Department
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