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RF Capture Simulation for Gold Ions in AGS
N/A
Date:
October 1, 2000
Creator:
Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Simulations of Bunch Merging in Booster
N/A
Date:
October 1, 2004
Creator:
Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Simulation of Scraping on the AGS Beam Dump
N/A
Date:
October 28, 2013
Creator:
Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Reaction cross-section calculations using new experimental and theoretical level structure data for deformed nuclei
A technique for modeling quasiparticle excitation energies and rotational parameters in odd-odd deformed nuclei has been used to construct sets of discrete states with energy 0 to 1.5 MeV in /sup 176/Lu and /sup 236/Np. These data were used as part of the input for calculation of isomer production cross-section ratios in the /sup 175/Lu(n,..gamma..)/sup 176/Lu and /sup 237/Np(n,2n)/sup 236/Np reactions. In order to achieve agreement with experiment, it has been found necessary to include in the modeled set many rotational bands (35 to 95), which are comprised of hundreds of levels with their gamma-ray branching ratios. It is essential that enough bands be included to produce a representative selection of K quantum numbers in the de-excitation cascade. 20 refs., 3 figs., 3 tabs.
Date:
October 5, 1984
Creator:
Hoff, R. W.; Gardner, D. G. & Gardner, M. A.
Object Type:
Article
System:
The UNT Digital Library
Isomer ratio calculations using modeled discrete levels
Isomer ratio calculations were made for the reactions: /sup 175/Lu(n,..gamma..)/sup 176m,g/Lu, /sup 175/Lu(n,2n)/sup 174m,g/Lu, /sup 237/Np(n,2n)/sup 236m,g/Np, /sup 241/Am(n,..gamma..)/sup 242m,g/Am, and /sup 243/Am(n,..gamma..)/sup 244m,g/Am using modeled level structures in the deformed, odd-odd product nuclei. The hundreds of discrete levels and their gamma-ray branching ratios provided by the modeling are necessary to achieve agreement with experiment. Many rotational bands must be included in order to obtain a sufficiently representative selection of K quantum numbers. The levels of each band must be extended to appropriately high values of angular momentum.
Date:
October 16, 1984
Creator:
Gardner, M. A.; Gardner, D. G. & Hoff, R. W.
Object Type:
Article
System:
The UNT Digital Library
Absolute dipole gamma-ray strength functions for /sup 176/Lu. Supplement
We have derived absolute dipole strength-function information for /sup 176/Lu from an average resonance capture study of /sup 175/Lu with 2-keV neutrons and from neutron capture cross-section measurements with neutrons from 30 keV to about 1 MeV. We found that we needed to increase our previous estimate of the relative M1/E1 strengths near 5 MeV by a factor of 3 and to revise downward the absolute magnitude of our E1 strength function. We accomplished the latter, while still maintaining continuity with the photonuclear data, by adjusting the one free parameter in our line shape. The present E1 and M1 strengths now seem correct both near the neutron separation energy and also around 1 MeV.
Date:
October 16, 1984
Creator:
Gardner, D. G.; Gardner, M. A. & Hoff, R. W.
Object Type:
Article
System:
The UNT Digital Library
ACTL: evaluated neutron activation cross section library-evaluation techniques and reaction index. [Tables, 10/sup -10/ to 20 MeV]
A library of evaluated neutron-induced activation cross sections (ACTL) was compiled. The library covers incident neutron energies from 10/sup -10/ to 20 MeV. General descriptions of the evaluation methods and an index to the evaluated cross sections are presented. 21 references.
Date:
October 17, 1978
Creator:
Gardner, M.A. & Howerton, R.J.
Object Type:
Report
System:
The UNT Digital Library
Surface hydrology, sediment transport dynamics, and remote sensing of disturbed watersheds in a humid temperature region
The specific objectives of this research are to quantify relationships between surface spectral properties and infiltration capacity explore the interaction between surface hydrology and basin morphology, specifically drainage network morphology, and develop a comprehensive process-response model for drainage basin evolution. This research examines the response of the drainage network and drainage basin water discharge to changes in the dominant processes that control infiltration and runoff, namely macropore network development. Infiltration, the primary regulator of runoff, is analyzed with respect to surface spectral characteristics and drainage basin water discharge. Changes in basin discharge measured on a storm event basis in the field are supplemented with simulated discharge events using a distributed hydrologic model. The hydrologic model is evaluated and parameterized by means of a detailed sensitivity analysis. The response of drainage basin water discharge to charges in infiltration properties of minesoils, and the inferred runoff process, and drainage network morphology is examined. The threshold discharge, or stream power, for sediment entrainment and the implications for changes in sediment discharge through time is also discussed. Ritter and Gardner conclude with a process-response model for drainage basin evolution, with implications for natural drainage basin response to climate change. Finally, basic rainfall-runoff relationships developed …
Date:
October 1, 1991
Creator:
Gardner, T.W. & Miller, A.C.
Object Type:
Report
System:
The UNT Digital Library
Booster Fault Study No. 17: Proton Beam on the D6 Septum Magnet
N/A
Date:
October 1, 2003
Creator:
Brown, K. A. & Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Torsion Testing of Plutonium
Results of torsion tests to determine the shear properties of plutonium are presented. Data on torsion properties are tabulated. (J.R.D.)
Date:
October 21, 1960
Creator:
Gardner, H. R.
Object Type:
Report
System:
The UNT Digital Library
Looking Ahead - Biofuels, H2, & Vehicles: 21st Industry Growth Forum
This presentation on the future of biofuels, hydrogen, and hybrid vehicles was presented at NREL's 21st Industry Growth Forum in Denver, Colorado, on October 28, 2008.
Date:
October 28, 2008
Creator:
Gardner, D.
Object Type:
Article
System:
The UNT Digital Library
Injection of large transverse emittance EBIS beams in booster
During the commissioning of EBIS beams in Booster in November 2010 and in April, May and June 2011, it was found that the transverse emittances of the EBIS beams just upstream of Booster were much larger than expected. Beam emittances of 11{pi} mm milliradians had been expected, but numbers 3 to 4 times larger were measured. Here and throughout this note the beam emittance, {pi}{epsilon}{sub 0}, is taken to be the area of the smallest ellipse that contains 95% of the beam. We call this smallest ellipse the beam ellipse. If the beam distribution is gaussian, the rms emittance of the distribution is very nearly one sixth the area of the beam ellipse. The normalized rms emittance is the rms emittance times the relativistic factor {beta}{gamma} = 0.06564. This amounts to 0.12{pi} mm milliradians for the 11{pi} mm milliradian beam ellipse. In [1] we modeled the injection and turn-by-turn evolution of an 11{pi} mm milliradian beam ellipse in the horizontal plane in Booster. It was shown that with the present injection system, up to 4 turns of this beam could be injected and stored in Booster without loss. In the present note we extend this analysis to the injection of …
Date:
October 10, 2011
Creator:
Gardner, C.
Object Type:
Report
System:
The UNT Digital Library
NUSTART: A PC code for NUclear STructure And Radiative Transition analysis and supplementation
NUSTART is a computer program for the IBM PC/At. It is designed for use with the nuclear reaction cross-section code STAPLUS, which is a STAPRE-based CRAY computer code that is being developed at Lawrence Livermore National Laboratory. The NUSTART code was developed to handle large sets of discrete nuclear levels and the multipole transitions among these levels; it operates in three modes. The Data File Error Analysis mode analyzes an existing STAPLUS input file containing the levels and their multipole transition branches for a number of physics and/or typographical errors. The Interactive Data File Generation mode allows the user to create input files of discrete levels and their branching fractions in the format required by STAPLUS, even though the user enters the information in the (different) format used by many people in the nuclear structure field. In the Branching Fractions Calculations mode, the discrete nuclear level set is read, and the multipole transitions among the levels are computed under one of two possible assumptions: (1) the levels have no collective character, or (2) the levels are all rotational band heads. Only E1, M1, and E2 transitions are considered, and the respective strength functions may be constants or, in the case …
Date:
October 1, 1990
Creator:
Larsen, G. L.; Gardner, D. G. & Gardner, M. A.
Object Type:
Report
System:
The UNT Digital Library
THE IMPACT PROPERTIES OF UNALLOYED PLUTONIUM
The effect of temperature on the unnotched and notched Charpy impact properties of plutonium was studied in the alpha, beta, gamma, and delta phases encompassing a temperature range of -43 to 330 deg C. Impact energies for unnotched specimens generally increased with increasing test temperature in the alpha and beta phases. Brittle failures were obtained in these phases. The specimen tested in the gamma phase did not fracture but bcnt in ofi U-shape and pulled through the anvil. lmpact energies for the Charpy V-notched specimens were much lower than for the unnotched spcc(mens.dt corresponding temperatures. Brittle failures were obtained in the alpha and beta phases; some ductility was evidenced in the gamma phase while the specimen tested in the delta phase did not fracture but bent in a U-shape. It was concluded that the beta phase is quite sensitive to both strain rate and notch effects. Fracture appearance in the alpha and beta phase is discussed from the standpoint of grain boundary effects and microcracking. (auth)
Date:
October 1, 1961
Creator:
Gardner, H.R.
Object Type:
Report
System:
The UNT Digital Library
Application Of Biometrical Genetics Techniques To Irradiated And Non- Irradiated Populations Of Corn To Provide Information On Nature Of Gene Action Involved In The Inheritance Of Quantitative Traits And In Heterosis. Final Report, 1970.
The purpose of this research was to extend out quantitative genetic investigations into some of the more basic aspects of genetic variation and heterosis observed in irradiated and non- irradiated populations of corn in order to determine more precisely how genes do act and interact to produce their observed cumulative effects.
Date:
October 31, 1971
Creator:
Gardner, C O
Object Type:
Report
System:
The UNT Digital Library
Application of Biometrical Genetic Techniques to Irradiated and Non- Irradiated Populations of Corn to Provide Information on Nature of Gene Action Involved in the Inheritance of Quantitative Traits and in Heterosis. Technical Progress Report, 1966--67.
This report talks about the Application of Biometrical Genetic Techniques to Irradiated and Non- Irradiated Populations of Corn to Provide Information on Nature of Gene Action Involved in the Inheritance of Quantitative Traits and in Heterosis.
Date:
October 31, 1967
Creator:
Gardner, C. O.
Object Type:
Report
System:
The UNT Digital Library
Ion-implantation doping of silicon carbide
Because of their commercial availability in bulk single crystal form, the 6H- and 4H- polytypes of SiC are gaining importance for high-power, high-temperature, and high-frequency device applications. Selective area doping is a crucial processing step in integrated circuit manufacturing. In Si technology, selective area doping is accomplished by thermal diffusion or ion-implantation. Because of the low diffusion coefficients of most impurities in SiC, ion implantation is indispensable in SiC device manufacturing. In this paper the authors present their results on donor, acceptor, and compensation implants in 6H-SiC.
Date:
October 1, 1997
Creator:
Gardner, J.; Edwards, A.; Rao, M.V.; Papanicolaou, N.; Kelner, G. & Holland, O.W.
Object Type:
Article
System:
The UNT Digital Library
Performance of coils wound from long lengths of surface-coated, reacted, BSCCO-2212 conductor
React-before-wind surface-coated BSCCO-2212 is being established as a relatively low cost HTS conductor for practical applications. Quality tape is presently being manufactured in 450-500m lengths at a cost estimated to be 1/3-1/5 of the industry costs of BSCCO-2223 powder-in-tube tape. Robust, mechanically sound coils for applications ranging from NMR insert magnets to transformer windings are being made from this BSCCO-2212 tape. The coils have performed consistently through test and thermal cycling without degradation and as projected from short sample measurements. A hybrid approach, which uses mainly BSCCO- 2212 augmented by BSCCO-2223 conductor in the high radial field end regions, is expected to halve magnet system costs.
Date:
October 1996
Creator:
Walker, M. S.; Hazelton, D. W. & Gardner, M. T.
Object Type:
Article
System:
The UNT Digital Library
Spherical diffusion of tritium from a point of release in a uniform unsaturated soil. A deterministic model for tritium migration in an arid disposal site
Tritium (Tr), when released as tritiated water at a point in a uniform and relatively dry soil, redistributes in both the liquid and vapor phases. The flux density of Tr in the liquid will exceed that in the vapor phase provided the water content is greater than approximately 15% of the total soil porosity. Thus Tr redistribution must be modeled recognizing transfer ``in parallel`` in both phases. The authors use the diffusion equation cast in spherical coordinates to analyze this problem in order to provide a basis for design of field experiments, and to offer observations on the long term behavior of such systems. The solution of the diffusion equation permits calculation of the evolution of profiles of Tr concentration, within and external to the sphere of released solution, assuming the initial concentration within this sphere to be uniform. The authors also predict the rate of advance of the maximum of Tr as it advances, and attenuates, in the soil. Calculations for the case of 1 million Curies of Tr diluted in 1 liter of water and released at a depth of 20 meters, and 200 meters above the water table, are demonstrated. If the soil has an initial water …
Date:
October 1, 1993
Creator:
Smiles, D. E.; Gardner, W. R. & Schulz, R. K.
Object Type:
Report
System:
The UNT Digital Library
Booster Fault Study No. 16: Deuteron Beam on the B6 Dump
A report on the booster fault study carried out on January 22, 2003.
Date:
October 2003
Creator:
Ahrens, L. A.; Brown, K. A. & Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Ion-implantation doping in SiC and its device applications
The latest ion-implantation results on SiC are presented. The authors have performed nitrogen and phosphorus (N/P) co-implantations to obtain very high n-type carrier concentrations, Si and C bombardments for compensating n-type SiC, and V-implantation for compensating p-type SiC. They have also performed N and Al implantations directly into V-doped semi-insulating 6H-SiC substrates. Vertical p-n junction diodes were made by selective area N, P, and N/P implantations into p-type epitaxial layers grown on 6H-SiC substrates.
Date:
October 1, 1997
Creator:
Rao, M.V.; Gardner, J.; Edwards, A.; Papanicolaou, N.; Kelner, G.; Holland, O.W. et al.
Object Type:
Article
System:
The UNT Digital Library
Draft versus finished sequence data for DNA and protein diagnostic signature development
Sequencing pathogen genomes is costly, demanding careful allocation of limited sequencing resources. We built a computational Sequencing Analysis Pipeline (SAP) to guide decisions regarding the amount of genomic sequencing necessary to develop high-quality diagnostic DNA and protein signatures. SAP uses simulations to estimate the number of target genomes and close phylogenetic relatives (near neighbors, or NNs) to sequence. We use SAP to assess whether draft data is sufficient or finished sequencing is required using Marburg and variola virus sequences. Simulations indicate that intermediate to high quality draft with error rates of 10{sup -3}-10{sup -5} ({approx} 8x coverage) of target organisms is suitable for DNA signature prediction. Low quality draft with error rates of {approx} 1% (3x to 6x coverage) of target isolates is inadequate for DNA signature prediction, although low quality draft of NNs is sufficient, as long as the target genomes are of high quality. For protein signature prediction, sequencing errors in target genomes substantially reduce the detection of amino acid sequence conservation, even if the draft is of high quality. In summary, high quality draft of target and low quality draft of NNs appears to be a cost-effective investment for DNA signature prediction, but may lead to underestimation …
Date:
October 29, 2004
Creator:
Gardner, S N; Lam, M W; Smith, J R; Torres, C L & Slezak, T R
Object Type:
Article
System:
The UNT Digital Library
New parameterization of the E1 gamma-ray strength function
The giant dipole (GD) parameters of peak energy, width, and cross section were satisfactorily correlated for elements from V to Bi, assuming two overlapping peaks with a separation dependent on deformation. The energy dependence of the GD resonance is assumed to have a Breit-Wigner form, but with an energy-dependent width. The resulting gamma-ray strength function model is used to predict neutron capture cross sections and gamma-ray spectra for isotopes of Ta, Os, and Au. 23 references.
Date:
October 18, 1979
Creator:
Gardner, D. G. & Dietrich, F. S.
Object Type:
Article
System:
The UNT Digital Library
Direct measurement of the W boson decay width in proton-antiproton collisions at s**(1/2) = 1.96-TeV
This dissertation describes a direct measurement of the W boson total decay width, {Lambda}{sub W}, using the D0 detector at the Fermilab Tevatron Collider. The measurement uses an integrated luminosity of 177.3 pb{sup -1} data, collected during the 2002-2003 run. The width is determined from the shape of the transverse mass distribution, M{sub T}, by fitting the data in the tail region 100 < M{sub T} < 200 GeV. The result if {Lambda}{sub W} = 2.011 {+-} 0.093(stat) {+-} 0.107(syst) GeV.
Date:
October 1, 2004
Creator:
Zhu, Jun-jie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library