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Articles 1 - 11 of 11

Full-Text Articles in Physics

The Half-Lives Of Some Short Lived Low Z Nuclei Formed By Photonuclear Reactions, Philip Phipps, D. J. Zaffarano Dec 1953

The Half-Lives Of Some Short Lived Low Z Nuclei Formed By Photonuclear Reactions, Philip Phipps, D. J. Zaffarano

Ames Laboratory ISC Technical Reports

The half-lives of several members of the "mirror" nuclei series have been measured, using improved scintillation counter detectors and a cycling apparatus which progams the synchrotron beam and several subsequent gated detectors in sequence repetitively. By the use of beta-ray energy discrimination, least squares fitting of decay curves, and by careful correction for background activities, the improved values listed in Table A were found.


Device For Detection And Identification Of Charged Particles From Photonuclear Reactions, Albert William Snyder, D. J. Zaffarano Dec 1953

Device For Detection And Identification Of Charged Particles From Photonuclear Reactions, Albert William Snyder, D. J. Zaffarano

Ames Laboratory ISC Technical Reports

A device is described which makes possible the determination of the energy spectrum of protons, alpha particles, or deuterons in the presence of other charged particles. Energy loss per unit path length (dE/dx) and total energy (E) are displayed in the form of voltage pulses of varying amplitudes in quadrature on an oscilloscope screen. The peaks of the pulses are intensitifed, resulting in hyperbolic loci for different types of particles. By masking the oscilloscope screen and using the moving film pulse height analysis technique developed in this laboratory, independent energy spectra may be obtained for each type of particle.


Transmission Of 0-5- Kilovolt Electrons By Thin Films With Applications To Beta-Ray Spectroscopy, Raymond O. Lane, D. J. Zaffarano Dec 1953

Transmission Of 0-5- Kilovolt Electrons By Thin Films With Applications To Beta-Ray Spectroscopy, Raymond O. Lane, D. J. Zaffarano

Ames Laboratory ISC Technical Reports

The penetration of electrons through matter has long been the subject of both theoretical and experimental investigations. Because of simplicity, the investigation frequently deals with a collimated beam of monoenergetic electrons incident normally upon a planar target. Two of the most useful measurements connected with such an experiment concern the range or depth of penetration of electrons in the target, and the intensity of the transmitted beam as a function of incident energy. One object of this research is to determine experimentally range-energy data for thin films. The other object is to measure the transmission of electrons by a thin ...


Ionization Yields Of Fission Fragments In Gases, Lloyd O. Herwig, Glenn Miller Dec 1953

Ionization Yields Of Fission Fragments In Gases, Lloyd O. Herwig, Glenn Miller

Ames Laboratory ISC Technical Reports

The present problem arises from a consideration of some of the experimental and theoretical results which were obtained previously, some of which will now be briefly mentioned. Fission fragment mass distributions which were derived from data obtained from double ionization chambers using argon plus carbon dioxide gases disagree with those obtained by means of radiochemical analysis of the fission products. Fission fragment velocity distributions which were also derived from double ionization chamber data disagree with those obtained from a direct measurement of velocities. Further, these double ionization chamber measurements of the total kinetic energy of fission give lower values than ...


Temperature Distribution In A Metal Cylinder Containing A Heat Source, Leon Pletke, Glenn Murphy Aug 1953

Temperature Distribution In A Metal Cylinder Containing A Heat Source, Leon Pletke, Glenn Murphy

Ames Laboratory ISC Technical Reports

The object of this reportt is to describe a method for finding the temperature distribution in a metal cylinder containing a heat source distributed in any manner throughout the cylinder. Specific solutions are given for cylinders with L/D ratios of 1, 2, 3, and ∞.

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Heats Of Solution And Related Thermochemical Properties Of Some Rare Earth Metals And Chlorides, James P. Flynn, F. H. Spedding Jul 1953

Heats Of Solution And Related Thermochemical Properties Of Some Rare Earth Metals And Chlorides, James P. Flynn, F. H. Spedding

Ames Laboratory ISC Technical Reports

An isothermally jacketed calorimeter has been constructed to measure the changes in heat content accompanying the solution of some rare earth metals and compounds. To check the performance of the apparatus, the integral heats of solution of potassium nitrate in water at 25°C have been measured. The values corrected to infinite dilution by use of relative apparent molal heat content data in the literature give 8384 +/- 12 cals/mole. The result agrees well with the values reported by others.


The Molten-Metal-Fuel Reactor, F. H. Spedding Jun 1953

The Molten-Metal-Fuel Reactor, F. H. Spedding

Ames Laboratory ISC Technical Reports

Scientists who were engaged in the atomic program before the end of 1943 had pretty well outlined most of the types of reactors which are being discussed today. These outlines were usually quite general and merely sketched the theoretical possibility of building a particular type of reactor. Many of these discussions were not recorded, and the records of others are hard to find today since they are buried in the Project literature and have not been properly indexed. However, a careful search of reports such as the minutes of the Project Council and the weekly and monthly reports of the ...


A Beta-Ray Spectrometer For Coincidence Measurements, R. T. Nichols, A. V. Pohm, J. H. Talboy Jr., E. N. Jensen May 1953

A Beta-Ray Spectrometer For Coincidence Measurements, R. T. Nichols, A. V. Pohm, J. H. Talboy Jr., E. N. Jensen

Ames Laboratory ISC Technical Reports

An intermediate image beta-ray spectrometer has been constructed utilizing the focusing properties of a U-shaped magnetic field distribution. The construction and performance of the instrument are discussed. A transmission of ten percent has been attained with a resolution of about six percent. A scintillation spectrometer is used in conjunction with the intermediate image spectrometer for the purpose of making coincidence measurements.


Operating Characteristics Of A D.C. Magnetic Ion Source, G. H. Miller, R. A. Lowry, J. E. Osher Mar 1953

Operating Characteristics Of A D.C. Magnetic Ion Source, G. H. Miller, R. A. Lowry, J. E. Osher

Ames Laboratory ISC Technical Reports

The operating characteristics of an ion source of the type described by Kistemaker and Dekker are given. The dependence of the total ion output on the ion source pressure, magnetic field, anode voltage, filament emission, and probe voltage is described. When hydrogen gas was used the ion· source operated stably for pressures in the range of 1.5 to 2.5 microns of Hg producing maximum ion currents of 3 to 5 ma. Its gas consumption was relatively high (22.5 cc/hr, STP) and the proton percentage of the ion beam was of the order of 8%. The best ...


Adsorption Spectrum Of Thulium Sulphate Octahydrate, Arthur Paskin, J. M. Keller Mar 1953

Adsorption Spectrum Of Thulium Sulphate Octahydrate, Arthur Paskin, J. M. Keller

Ames Laboratory ISC Technical Reports

The term splitting of the absorption spectrum of thulium sulphate octalhydrate due to crystal field effects was calculated according to first order perturbation theory. Departures from Russell-Saunders Coupling were taken into account. The various transition mechanisms were examined with and without crystal coupling. It was found that crystal coupling effects are important in destroying J and parity selection rules. Transitions induced by these effects are often more important than transitions calculated neglecting crystal coupling. Zeeman patterns were also studied for the several interesting directions of propagation and polarization of the light relative to the magnetic field directione Susceptibility calculations made ...


A Proportional Counter Spectrometer Study Of The Beta-Decay Of Radioactive S-35, Pm-147, Ni-63, And C-14, J. P. Mize, D. J. Zaffarano Mar 1953

A Proportional Counter Spectrometer Study Of The Beta-Decay Of Radioactive S-35, Pm-147, Ni-63, And C-14, J. P. Mize, D. J. Zaffarano

Ames Laboratory ISC Technical Reports

A proportional counter spectrometer, hereinafter denoted as a p.c.s., of unique design has been constructed for the purpose of measuring beta-spectra whose energies lie below a few hundred Kev. The p.c.s. is well suited for the problem in that thin and uniform radioactive sources which are essential for accurate low energy spectral measurements can be employed. The utilization of radioactive sources of low surface densities is made possible by an allowable source area of a few square centimeters and an ~100 per cent geometrical efficiency for particle detection by the p.c.s. In addition, the ...