UNT Libraries Government Documents Department - 30 Matching Results

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Measurement of the neutron-induced fission cross section of /sup 244/Pu relative to /sup 235/U from 0. 2 to 30 MeV

Description: Continuing fission cross section ratio studies at Lawrence Livermore Laboratory, preliminary results have been determined for the /sup 244/Pu//sup 235/U fission cross section ratio from 0.2 to 30 MeV. Using the threshold method, the value 0.980 +- 0.021 has been obtained for the average cross section ratio in the interval from 1.75 to 4.00 MeV.
Date: December 9, 1976
Creator: Behrens, J. W.; Newbury, R. S.; Browne, J. C. & Carlson, G. W.
Item Type: Refine your search to only Report
open access

Measurement of high energy ions

Description: The current interest in fast ions has prompted the design of a new time-of-flight ion spectrometer which measures the high energy ions from a laser produced plasma. A magnet was used to separate the ions from the intense background of electrons, x-rays and scattered light. The design of the instrument is wide band so that ions with energies 0.03 to 3000 keV/amu can be measured. Results from target experiments on the LLL ARGUS laser facility will be presented. The fast ion spectrum is dovetailed… more
Date: November 9, 1976
Creator: Glaros, S. S.; Tirsell, K. G.; Rupert, V. C.; Catron, H. C. & Slivinsky, V. W.
Item Type: Refine your search to only Article
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Fluorescence line narrowing studies in glass

Description: Paramagnetic ions in glass reside in a distribution of physically different environments. By using a tunable laser source, selected groups of ions within an inhomogeneously broadened absorption band are excited and line-narrowed fluorescence is observed. The technique of laser-induced fluorescence line narrowing has been applied to several rare-earth ions in glasses to investigate site-to-site variations in energy levels, probabilities for radiative and non-radiative transitions, homogeneous li… more
Date: September 9, 1976
Creator: Weber, M. J.
Item Type: Refine your search to only Article
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Improved detection limits in energy dispersive x-ray fluorescence analysis, using polarized x rays

Description: Polarized x-radiation is shown to be a superior and practical excitation source for measuring trace elements by energy dispersive x-ray fluorescence. In this study, polarization was obtained by scattering the primary beam at 90/sup 0/ from boron carbide. The losses inherent in the geometric requirements and the polarizer efficiency can be more than compensated for by using a close-coupled system and a standard, high-power x-ray tube. With the system described here, which uses a molybdenum anode… more
Date: September 9, 1976
Creator: Ryon, R. W.
Item Type: Refine your search to only Article
open access

Is plutonium really necessary

Description: Not all activities associated with nuclear power contribute equally to proliferation potential, but some fuel-cycle activities (i.e., reprocessing) are considered too dangerous to be permitted in non-weapons countries. This paper assesses the feasibility of keeping Pu out of the nuclear fuel cycle. It is pointed out that there is no technical necessity of using Pu as nuclear fuel so long as /sup 235/U is available. Analysis of the economics of recycling spent fuel products in LWRs in the U.S. s… more
Date: September 9, 1976
Creator: Taylor, V.
Item Type: Refine your search to only Article
open access

Mirror hybrid reactor optimization studies

Description: A system model of the mirror hybrid reactor has been developed. The major components of the model include (1) the reactor description, (2) a capital cost analysis, (3) various fuel management schemes, and (4) an economic analysis that includes the hybrid plus its associated fission burner reactors. The results presented describe the optimization of the mirror hybrid reactor, the objective being to minimize the cost of electricity from the hybrid fission-burner reactor complex. We have examined … more
Date: September 9, 1976
Creator: Bender, D. J.
Item Type: Refine your search to only Article
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EM 0211: standpipe-bubbler pump level control study, cover gas system analysis, (TASK B), W. P. 7373. [LMFBR]

Description: In addition to the basic definition of the Standpipe Bubbler performance, several tasks pertaining to specific cover gas/pump interface design problems were included within the Standpipe Bubbler Study effort. This report covers the following noted specific tasks of the Standpipe Bubbler Study: gas supply system design; gas ingestion by pump; identification of failure modes and recovery methods; manual override system; and effect of loss of gas pressure.
Date: August 9, 1976
Creator: Greer, A.
Item Type: Refine your search to only Report
open access

Low-cost silicon solar array project. First annual report, January 1975--March 1976

Description: The Low-Cost Silicon Solar Array Project (LSSA) was established to greatly reduce the price of solar arrays by the improvement of manufacturing technology, by adaptation of mass production techniques, and by helping achievement of user acceptance. The Project's approach includes the development of technology, its transfer by industry to commercial practice, the evaluation of the economics involved, and the stimulation of market growth. The activities and progress of the LSSA Project during its … more
Date: August 9, 1976
Item Type: Refine your search to only Report
open access

Low energy time-of-flight spectra from spheres pulsed by 14-MeV neutrons

Description: The neutron emission spectra from spheres of Be, N, O, C, Pb, /sup 235/U, /sup 238/U, /sup 239/Pu, H/sub 2/O, and CH/sub 2/ pulsed at the center by 14-MeV neutrons were measured over the energy range of 10 eV to 1 MeV, using sphere transmission and time-of-flight techniques. The neutron source was obtained by the T(d,n)/sup 4/He reaction with a pulsed 400-keV deuteron beam produced by the Livermore ICT accelerator. The neutron detector was a thick /sup 6/Li loaded glass scintillator calibrated … more
Date: August 9, 1976
Creator: Webster, W. M. & Brown, P. S.
Item Type: Refine your search to only Report
open access

Radiation damage at the Rotating Target Neutron Source (RTNS-I) facility at Lawrence Livermore Laboratory

Description: Some of the basic computational features of a computer program used for modeling radiation damage at LLL's Rotating Target Neutron Source (RTNS-I) are presented. Input items required are material cross-section and angular distribution data, such as used for LLL neutron transport calculations, along with one particular neutron spectrum of interest. The nuclear reactions considered are elastic, neutron-emitting, and charged-particle-emitting. Classical and relativistic mechanics are used as requi… more
Date: August 9, 1976
Creator: Logan, C. M. & Russell, E. W.
Item Type: Refine your search to only Report
open access

Weinberg--Salam gauge model and neutrino proton elastic scattering. [Differential cross sections]

Description: Elastic scattering of neutrino on proton is studied in the Weinberg-Salam gauge model of neutral currents. Particular attention is paid to the experimental cuts relevant to two recent BNL experiments and spectra averaging so that model predictions can be directly compared to the experimental data. The uncertainty in the calculation due to changes in the parameters which are not well determined such as the mass of the axial vector meson is emphasized. It is concluded that the simple Weinberg-Sal… more
Date: August 9, 1976
Creator: Sidhu, D P
Item Type: Refine your search to only Report
open access

Advanced-fueled fusion reactors suitable for direct energy conversion. Project note: temperature-gradient enhancement of electrical fields in insulators

Description: Direct energy converters for use on controlled fusion reactors utilize electrodes operated at elevated voltages and temperatures. The insulating elements that position these electrodes must support large voltages and under some circumstances large thermal gradients. It is shown that even modest thermal gradients can cause major alterations of the electric-field distribution within the insulating element.
Date: July 9, 1976
Creator: Blum, A. S. & Mancebo, L.
Item Type: Refine your search to only Report
open access

Correlation experiments and the nonvalidity of ordinary ideas about the physical world

Description: It is shown that the predictions of quantum theory in certain correlations experiments are incompatible with ordinary ideas about the physical world. In particular the following theorem is proved: Consider situations involving two experimenters, one working in each of two space-like separated regions. Suppose each is apparently free to choose to perform in his region one of two alternative experiments. Assume that the results that would be obtained in each of the alternative cases conform to th… more
Date: July 9, 1976
Creator: Stapp, H. P.
Item Type: Refine your search to only Report
open access

Selected topics from continuum mechanics

Description: An attempt is made to provide a simple, nonrigorous introduction to some of the basic concepts and vocabulary of continuum mechanics. Some fundamental equations and ''physical facts'' are presented without significant derivation. The treatment is not comprehensive, but a number of references are given which can serve as starting points for study in greater depth. The subjects treated are elastic solids, material failure, gases and shock waves, liquids, instabilities, and detonation propagation.… more
Date: July 9, 1976
Creator: White, J. W.
Item Type: Refine your search to only Report
open access

Acoustic emission from beryllium

Description: The acoustic emission from both powder and ingot source beryllium has been measured as a function of strain and prior heat treatment. Most measurements were made during tensile deformation, but a limited number of compression tests have also been performed. The acoustic emission observed was of the burst type, with little or no contribution from continuous type emission. The emission was characterized by the variation of burst rate and average energy per burst as a function of strain. The tensi… more
Date: June 9, 1976
Creator: Heiple, C. R. & Adams, R. O.
Item Type: Refine your search to only Report
open access

Connection between adiabaticity and the mirror mode

Description: The size of magnetic moment jumps of a particle in a long, thin equilibrium magnetic mirror field is shown to be related to the complex zeroes of the mirror mode parameter B + 4..pi..dP/sub perpendicular//dB. A consequence is that adiabaticity places a lower limit on ..beta.. than does the mirror mode.
Date: June 9, 1976
Creator: Cohen, R. H.
Item Type: Refine your search to only Report
open access

Carcinogenicity of Residual Fuel Oils by Nonbiological Laboratory Methods: Annotated Bibliography

Description: Recent emphases have been directed by Federal government regulatory agencies and other research groups on the carcinogenic effects of certain aromatic hydrocarbon components in naturally occurring petroleum products. These are used in plant operations, and underline the importance of evaluating environments. Since Rocky Flats Plant uses large quantities of fuel oil, the author was prompted to undertake a search of the chemical literature. Articles and accounts of studies were reviewed on nonbio… more
Date: April 9, 1976
Creator: Cichorz, Roger S.
Item Type: Refine your search to only Report
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