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Full-Text Articles in Physics

An Economic Evaluation Of The Silica Gel Adsorption Process For The Separation Of Hafnium From Zirconium, W. R. Millard, R. H. Maitland Aug 1952

An Economic Evaluation Of The Silica Gel Adsorption Process For The Separation Of Hafnium From Zirconium, W. R. Millard, R. H. Maitland

Ames Laboratory ISC Technical Reports

An economic evaluation has been made of the silica gel adsorption process for the separation of hafnium and zirconium. It is estimated that hafnium-free zirconium can be prepared at a cost of $7.10 per pound in the form of ZrOCl-2·8H-2O. This salt is satisfactory for the preparation of ZrF-4 by the Ames wet process.


Angular Distribution Of Photoprotons From Aluminum And Tantalum, Marvin M. Hoffman, D. J. Zaffarano Aug 1952

Angular Distribution Of Photoprotons From Aluminum And Tantalum, Marvin M. Hoffman, D. J. Zaffarano

Ames Laboratory ISC Technical Reports

The study of those nuclear reactions which occur as a result of x-ray irradiation has been greatly facilitated by the increasing availability of high energy betatrons and synchrotrons. On occasion radioactivity may be induced in irradiated nuclei and in these cases it is possible to conclude that either a new element or an isotope of the bombarded nucleus has been formed. Since the nature of the radiation from many unstable nuclei is well known, a study of the type and energy of the emitted particles and the period of radioactive decay will usually suffice to determine which nucleus has been ...


Radiations Of Certain Synchrotron-Induced Radioactivities, Streatfield H. Cox Jr., L. Jackson Laslett Jun 1952

Radiations Of Certain Synchrotron-Induced Radioactivities, Streatfield H. Cox Jr., L. Jackson Laslett

Ames Laboratory ISC Technical Reports

This work has born out the usefulness of scintillation counter techniques in connection with radioactivities produced by synchrotron irradiation. The activity of the sources produced has been ample for obtaining good statistical accuracy in short counting periods.


Electrical Properties Of Thin Metallic Films, D. B. Barker, W. C. Caldwell Mar 1952

Electrical Properties Of Thin Metallic Films, D. B. Barker, W. C. Caldwell

Ames Laboratory ISC Technical Reports

The Hall coefficient and conductivity of silver films were measured by a DC method and comparisons with the theoretical calculations of Fuchs and Sondheimer were made. Films from 150 A. to 1500 A. in thickness were deposited by evaporation at pressures below 10^-2 microns. The electrical properties were studied at liquid nitrogen, dry ice and acetone, and room temperatures. Film thickness measurements were made by the interferometer method. Electron diffraction and electron micrograph pictures were taken to study agregation and to check on the purity of the films. The electron micrographs show aggregation in films less than 300 A ...


The Resistivity Of Lanthanum, Cerium, Praseodymium And Neodymium At Low Temperatures, Nancy R. James, Sam Legvold, Frank H. Spedding Mar 1952

The Resistivity Of Lanthanum, Cerium, Praseodymium And Neodymium At Low Temperatures, Nancy R. James, Sam Legvold, Frank H. Spedding

Ames Laboratory ISC Technical Reports

The electrical resistivity of lanthanum, cerium, praseodymium, and neodymium was measured between room temperature and approximately 2°K. The behavior was found to be affected by the method of preparation, the heat treatment, and the crystal structure of the samples, the latter bearing the greatest significance.