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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1948
Supersonic Interception vs Subsonic Attack

Supersonic Interception vs Subsonic Attack

Date: June 15, 1948
Creator: Shoults, D. R. & Millikan, C. P.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Recovery of Materials

Recovery of Materials

Date: September 22, 1948
Creator: Leverett, Miles
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Economic and Strategic Considerations of Metals

Economic and Strategic Considerations of Metals

Date: September 14, 1948
Creator: Grant, N. J.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Turbulent Diffusion Pattern of Turbojet Exhaust

Turbulent Diffusion Pattern of Turbojet Exhaust

Date: September 9, 1948
Creator: Cooley, W. C.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Relation Between Engine and Airplane Characteristics

Relation Between Engine and Airplane Characteristics

Date: June 10, 1948
Creator: Pinkel, Benjamin ((NACA)
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Polonium-Powered Aircraft for Military Purposes

Polonium-Powered Aircraft for Military Purposes

Date: September 28, 1948
Creator: Kaufmann,A. R.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Index to Lexington Project Reports

Index to Lexington Project Reports

Date: November 1, 1948
Creator: none
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some Reactor Engineering Problems

Some Reactor Engineering Problems

Date: August 10, 1948
Creator: Leverett, M. C.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Meeting with Dr. Manson Benedict -- Reactor Location

Meeting with Dr. Manson Benedict -- Reactor Location

Date: July 23, 1948
Creator: Thiele, E. W.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The Formation of U232 by Helium Ions of Thorium

The Formation of U232 by Helium Ions of Thorium

Date: April 14, 1948
Creator: Newton, Amos S.
Description: The production of U{sup 232} by the sum of {alpha},4n and {alpha},p 3n reactions on thorium has been studied. The cross section at an average energy of 37.5 Mev was 0.013 barns and the threshold for the reaction was about 30 Mev.
Contributing Partner: UNT Libraries Government Documents Department
Loss of Radioactivity from Barium Carbonate Samples

Loss of Radioactivity from Barium Carbonate Samples

Date: January 9, 1948
Creator: Yankwich, Peter E.
Description: The exchange loss of radioactivity from solid samplos of barium carbonate through the agency of carbonic acid and its ions has been investigated under a variety of conditions. It is concluded that the losses observed are greatly dependent upon the method of sample preparation, in particular the nature or any heat treatment which the sample materials undergo.
Contributing Partner: UNT Libraries Government Documents Department
Monthly Progress Report No. 57 for January 1948

Monthly Progress Report No. 57 for January 1948

Date: January 1, 1948
Creator: Authors, Various
Description: This report gives a short summary of the work done in the following fields for the month of January 1948: (1) 184-inch cyclotron; (2) 60-inch cyclotron; (3) synchrotron; (4) linear accelerator; (5) experimental physics; (6) theoretical physics; (7) isotope research; (8) chemistry; (9) medical physics; and (10) health physics and chemistry.
Contributing Partner: UNT Libraries Government Documents Department
Degradation of Isotopic Lactate and Acetate

Degradation of Isotopic Lactate and Acetate

Date: February 24, 1948
Creator: Aronoff, S.; Haas, V.A. & Fries, B.A.
Description: A scheme of glucose degradation has been validated by the use of intermediates of known isotopic composition. In this scheme: glucose {yields} lactic acid {yields} CO{sub 2} (C-3,4) + acetic acid {yields} CO{sub 2} (C-2,5) + acetone {yields} iodoform (C-1,6) + acetate (C-1,6; 2,5), it was found that (a) in the oxidation of lactic acid, approximately 4.7% of the acetic acid was oxidized to CO{sub 2}; and (b) under the conditions prescribed, BaCO{sub 3} from the degradation of Ba acetate contained approximately 1.5% of the activity of the methyl group.
Contributing Partner: UNT Libraries Government Documents Department
Comparative Deposition of Zr95 in a Reticulo Endothelial Tumor to Normal Tissue in a Human Patient

Comparative Deposition of Zr95 in a Reticulo Endothelial Tumor to Normal Tissue in a Human Patient

Date: March 1, 1948
Creator: Low-Beer, B.V.; Scott, K.G.; Hamilton, J.G. & Stone, R.S.
Description: A test dose of Zr{sup 95} was given to a female patient which had a metastatic reticula endothelial tumor at the distal portion of the left femur. A comparison of the deposition of Zr{sup 95} showed greater uptake 24 hours after administration than any of the normal tissues investigated.
Contributing Partner: UNT Libraries Government Documents Department
High Voltage Pulsar For 184-inch Cyclotron Electric Deflector

High Voltage Pulsar For 184-inch Cyclotron Electric Deflector

Date: April 24, 1948
Creator: Kerns, Q.A.; Baker, W.R.; Edwards, R.F. & Farly, G.M.
Description: This paper describes a high voltage pulse generator developed to deflect the beam of the 184-inch cyclotron at Berkeley, California. The apparatus develops a deflecting potential of 200 kilovolts that rises from 10% to 90% of peak value in 0.1 microseconds. The unit employs two similar 100 kilovolt water cooled pulse transformers connected symmetrically about ground to the electric deflector bars. Water-cooled General Electric pulse capacitors are discharged through the two turn primary windings of the pulse transformers by triggering a battery of 16 paralleled Kuthe 5022 hydrogen thyratrons. Output voltages are developed across the 17 turn secondary winding of the pulse transformer. The transformer is mounted in an oil filled lucite case that provides both insulation and compact design.
Contributing Partner: UNT Libraries Government Documents Department
Nuclear Reactions of Arsenic with 190 Mev Deuterons

Nuclear Reactions of Arsenic with 190 Mev Deuterons

Date: January 21, 1948
Creator: Hopkins Jr, H.H. & Cunningham, B.B.
Description: Isotopes formed in the bombardment of {sub 33}As{sup 75} with 190 Mev deuterons range in atomic number up to 24 (or more) mass units lighter than As{sup 75}. Identification of these isotopes was based on chemical behavior and half-life determination. Relative yields have been calculated and show that 80% of the observed reactions produce isotopes within 8 mass units of As{sup 75}. Three new isotopes have been observed: 9.5 d. Se{sup 72} (K), 44 m, Se{sup 71} ({beta}{sup +}), and 52 m, As{sup 71} ({beta}{sup +}).
Contributing Partner: UNT Libraries Government Documents Department
Stars in Photographic Emulsions Initiated by Deuterons Part II. Theoretical

Stars in Photographic Emulsions Initiated by Deuterons Part II. Theoretical

Date: January 1, 1948
Creator: Horning, Wendell & Baumhoff, L.
Description: The theory of high energy nuclear stars depends on a theory of nuclear transparency and on a theory of nuclear evaporation. The transparency can be computed on the basis of a model proposed by R. Serber as soon as the interactions between the nucleons and the incident particle are known. The evaporation can be computed on the basis of the statistical model of the nucleus as soon as the nuclear entropy and binding energies of the evaporated particles are known. The calculations have been formulated with approximate values for the above interactions, entropies, and binding energies; and by means of various mathematical methods: a method of averages, a method of reaction integrals, and one using diffusion equations. Probability distributions have been obtained for the number of prongs per star, and distributions are being computed for the energy and angle of a prong. The results are in qualitative agreement with the observations on photographic emulsions described in Part I.
Contributing Partner: UNT Libraries Government Documents Department
Stars in Photographic Emulsions Initiated by Deuterons Part II. Theoretical

Stars in Photographic Emulsions Initiated by Deuterons Part II. Theoretical

Date: September 7, 1948
Creator: Horning, W. & Baumhoff, L.
Description: The theory of high energy nuclear stars depends on a theory of nuclear transparency and on a theory of nuclear evaporation. The transparency can be computed on the basis of a model proposed by R. Serber as soon as the interactions between the nucleons and the incident particle are known. The evaporation can be computed on the basis of the statistical model of the nucleus as soon as the nuclear entropy and binding energies of the evaporated particles are known. With approximate values for the above interactions, entropies, and binding energies, a probability distribution has been computed for the number of prongs per star. The results are in qualitative agreement with the observations on photographic emulsions described in Part 1.
Contributing Partner: UNT Libraries Government Documents Department
Spectral Lines of Curium from 3100 A to 4200 A

Spectral Lines of Curium from 3100 A to 4200 A

Date: April 7, 1948
Creator: Conway, John G. & Moore, Milton F.
Description: Fifty-four spectral lines of curium are listed together with estimated intensities. A brief description of the manner of taking the spectra and of measuring the lines is given. Three separate samples of curium, in all seven micrograms, were submitted for spectrochemical analysis. The samples in acidic solution (HCl) were evaporated on copper electrodes and analyzed as outlined for the copper spark method. An Applied Research Laboratories spark source was used. The spectra were taken on a Baird Associates spectrograph of the modified Eagle type which has a dispersion of 5.6 A/mm in the first order. Spectrum Analysis photographic plates were used and were processed according to the manufacturer's recommendations. The plates were placed in the projection comparator (also an Applied Research Laboratories Unit) and the lines measured using the scale associated with the projection screen. The copper lines of the spectra were used as a wavelength standard. In all 54 lines which we feel can be attributed to curium were found. These, together with an estimated intensity based on an arbitrary 1 to 10 scale, are listed in Table 1. Due to the high alpha-activity of curium special care had to be exercised in handling the samples. In this case ...
Contributing Partner: UNT Libraries Government Documents Department
Neutron Deficient Isotopes of Tellurium and Antimony

Neutron Deficient Isotopes of Tellurium and Antimony

Date: January 1, 1948
Creator: Lindner, M. & Perlman, I.
Description: While investigating the relative yields for the many reactions resulting from the irradiation of antimony with 200-Mev deuterons in the Berkeley 184-inch cyclotron several previously unreported isotopes of tellurium and antimony were encountered. The tellurium fraction when followed on a thin mica window counter could be resolved into half-life periods of 2.5 hrs, 6.0 days and a small amount of a long-lived component. The 2.5 hour period has not been further characterized with respect to mass number or mode of decay other than to note that the radiation is predominantly electrons. The 6.0-day period is accompanied by positrons which were shown to be due to a 3.5 minute antimony daughter which is undoubtedly the same activity assigned to Sb{sup 118} by Risser, Lark-Horowitz and Smith. The positron energy was found to be 3.1 {+-} 0.2 Mev by absorption in berylllum and from the end point of the energy distribution curve taken with a low-resolution beta-ray spectrometer. Gamma activity is also present with this period. The 6.0-day tellurium showed a high abundance of x-rays, little or no conversion electrons and some gamma-ray activity which could be due to the 3.5 minute antimony daughter. The tellurium fraction contained another component of 4.5-day ...
Contributing Partner: UNT Libraries Government Documents Department
The Estimation of Heats of Formation

The Estimation of Heats of Formation

Date: February 2, 1948
Creator: Brewer, Leo
Description: The procedure for estimation of heats of formation of compounds is illustrated by discussion of compounds of several of the elements of the actinide series. The procedure is particularly suited for lanthanide and actinide elements because of the similarity of the ionic radii and types of bonding.
Contributing Partner: UNT Libraries Government Documents Department
Excitation Curves of C12(p,pn)C11 and B11(p,n)C11 up to 32 MeV.

Excitation Curves of C12(p,pn)C11 and B11(p,n)C11 up to 32 MeV.

Date: April 20, 1948
Creator: Phillips, Robert & Panofsky, Wolfgang K.H.
Description: The reaction C{sup 12} (p,pn)C{sup 11} which has been studied by McMillan, Chubb and Miller for energies up to 100 Mev is an example of a reaction whose high energy behavior cannot be explained by a compound nucleus process. The purpose of the study was to investigate this reaction at the high resolution possible with the Berkeley linear accelerator near the excitation threshold. The excitation curve was obtained by stacking specially molded polystyrene (composition C{sub n}H{sub n}) foils of high uniformity and bombarding them in the proton beam. The resultant activity was then counted on a Geiger counter in standard geometry. The resultant curve is shown in Figure 1. An immediately evident feature is the sharp threshold of the reaction. The second derivative curve, illustrated in Figure 2, of the excitation shows an RMS width of 270 kV, the theoretical straggling width due to the foils of 170 kv, and the remaining width in accordance with the energy spread of approximately {+-} 100 kv half width of the linear accelerator. The data therefore are compatible with a sharp threshold for this reaction. This curve, incidentally, furnishes independent evidence as to the energy homogeneity of the linear accelerator beam.
Contributing Partner: UNT Libraries Government Documents Department
The Half-Lives of Aluminum25 and Aluminum26

The Half-Lives of Aluminum25 and Aluminum26

Date: April 24, 1948
Creator: Bradner, Hugh & Gow, J.D.
Description: The availability of separated isotopes of Mg makes it easy to determine the half life of Al{sup 26}, a member of the Wigner series which has long been suspected to have a half life of approximately 7 seconds, but which has not been confirmed because of the masking 7 second activity of Al{sup 26}. Mg{sup 24}, Mg{sup 25} and Mg{sup 26} (in the form of MgO) have been bombarded with protons from the Berkeley Linear Accelerator, with the following results: (1) Mg{sup 24} yields an activity of approximately 23 seconds half life, presumably due to Na{sup 21} from the reaction Mg{sup 24}(p,a)Na{sup 21}; (2) the Mg{sup 25} yields an activity of approximately 8 seconds half life, which they assign to the reaction Mg{sup 25}(p,n)Al{sup 25}; and (3) The Mg{sup 26} yields an activity of approximately 6 seconds half life, assigned to Al{sup 26} according to a similar reaction. It seems probable therefore that the 7 seconds half life normally given for Al{sup 26} is a mixture of these two activities.
Contributing Partner: UNT Libraries Government Documents Department
THE RELATION OF BACKSCATTERING TO SELF-ABSORPTION

THE RELATION OF BACKSCATTERING TO SELF-ABSORPTION

Date: January 1, 1948
Creator: Yankwich, Peter E. & Weigl, John.
Description: The effects of backscattering upon self-absorption correction curves are demonstrated. Data are given for the backscattering powers of several substances for the beta radiations from C{sup 14}, and for se1f-absorption of samples of barium carbonate and wax, containing C{sup 14}, mounted on aluminum.
Contributing Partner: UNT Libraries Government Documents Department
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