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147,374 Matching Results
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Band anticrossing effects in Mg{sub y}Zn{sub 1-y}Te{sub 1-x}Se{sub x} alloys
None
Date:
August 7, 2001
Creator:
Wu, J.; Walukiewicz, W.; Yu, K. M.; Ager, J. W., III; Shan, W.; Haller, E. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Composition dependence of the hydrostatic pressure coefficients of the bandgap of ZnSe{sub 1-x}Te{sub x} alloys
None
Date:
February 14, 2003
Creator:
Wu, J.; Walukiewicz, W.; Yu, K. M.; Shan, W.; Ager, J. W., III; Haller, E. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Liquid/vapor surface tension of metals: Embedded atom method with charge gradient corrections
Molecular dynamics (MD) simulations for three separately parameterized embedded atom methods (EAM) function sets are used to determine the liquid/vapor surface tension {gamma} for Al, Ni, Cu, Ag, and Au. The three EAM models differ in both the functional forms employed and the fitting procedure used. All the EAM potentials underestimate {gamma} but one of the models performs consistently better than the others. The authors show that including a correction to the local charge density associated with gradients in the density together with exploiting the invariance of the EAM bulk potential to appropriate transformations in the charge density can lead to improved values for {gamma}, as well as for solid free surface energies, within existing EAM function sets.
Date:
March 21, 2000
Creator:
Webb, Edmund B., III & Grest, Gary S.
Object Type:
Article
System:
The UNT Digital Library
Possible triaxial superdeformation in {sup 174}Hf.
Three, possibly four, regularly spaced rotational bands with large dynamical moments of inertia, which are consistent with known superdeformed bands in the Lu/Hf region, have been identified in {sup 174}Hf. The states were populated in the {sup 130}Te({sup 48}Ca,4n) reaction at a beam energy of 194 MeV. The Gammasphere array detected the emitted gamma radiation. Ultimate cranker calculations predict substantial triaxial deformation ({gamma} {approx} {+-} 17{sup o}) for highly deformed {sup 174}Hf structures. However, {sup 174}Hf is eight neutrons away from the previously established N = 94 triaxial superdeformed shell gap. Shell gaps at N = 100 and 106 with {gamma} {ge} 15{sup o} are observed when {var_epsilon}{sub 2} {approx} 0.45, which may be responsible for the predicted TSD minima in {sup 174}Hf.
Date:
September 18, 2002
Creator:
Hartley, D. J.; Djongolov, M.; Riedinger, L. L.; Kondev, F. G.; Janssens, R. V. F.; Abu Saleem, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Generation, Transport and Deposition of Tungsten-Oxide Aerosols at 1000 C in Flowing Air-Steam Mixtures.
Experiments were conducted to measure the rates of oxidation and vaporization of pure tungsten rods in flowing air, steam and air-steam mixtures in laminar flow. Also measured were the downstream transport of tungsten-oxide condensation aerosols and their region of deposition, including plateout in the superheated flow tube, rainout in the condenser and ambient discharge which was collected on an array of sub-micron aerosol filters. The nominal conditions of the tests, with the exception of the first two tests, were tungsten temperatures of 1000 C, gas mixture temperatures of 200 C and wall temperatures of 150 C to 200 C. It was observed that the tungsten oxidation rates were greatest in all air and least in all steam, generally decreasing non-linearly with increasing steam mole fraction. The tungsten oxidation rates in all air were more than five times greater than the tungsten oxidation rates in all steam. The tungsten vaporization rate was zero in all air and increased with increasing steam mole fraction. The vaporization rate became maximum at a steam mole fraction of 0.85 and decreased thereafter as the steam mole fraction was increased to unity. The tungsten-oxide was transported downstream as condensation aerosols, initially flowing upwards from the tungsten …
Date:
October 1, 2001
Creator:
Greene, G. A. & Finfrock, C. C.
Object Type:
Report
System:
The UNT Digital Library
Single-Bunch Instability Driven by the Electron Cloud Effect inthe Positron Damping Ring of the International Linear Collider
Collective instabilities caused by the formation of an electron cloud (EC) are a potential limitation to the performances of the damping rings for a future linear collider. In this paper, we present recent simulation results for the electron cloud build-up in damping rings of different circumferences and discuss the single-bunch instabilities driven by the electron cloud.
Date:
May 16, 2005
Creator:
Pivi, Mauro; Raubenheimer, Tor O.; Ghalam, Ali; Harkay, Katherine; Ohmi, Kazuhito; Wanzenberg, Rainer et al.
Object Type:
Article
System:
The UNT Digital Library
Multicomponent-Multiphase Equation of State for Carbon
None
Date:
September 1, 2001
Creator:
Kerley, Gerald I. & Chhabildas, Lalit
Object Type:
Report
System:
The UNT Digital Library
Synthesis and Characterization of Templated Ion Exchange Resins for the Selective Complexation of Actinide Ions
The purpose of this research is to develop a polymeric extractant for the selective complexation of uranyl ions (and subsequently other actinyl and actinide ions) from aqueous solutions (lakes, streams, waste tanks and even body fluids). Chemical insights into what makes a good complexation site will be used to synthesize reagents tailor-made for the complexation of uranyl and other actinide ions. These insights, derived from studies of molecular recognition include ion coordination number and geometry, ionic size and ionic shape, as well as ion to ligand thermodynamic affinity. Selectivity for a specific actinide ion will be obtained by providing the polymers with cavities lined with complexing ligands so arranged as to match the charge, coordination number, coordination geometry, and size of the actinide metal ion. These cavity-containing polymers will be produced by using a specific ion (or surrogate) as a template around which monomeric complexing ligands will be polymerized. The complexing ligands will be ones containing functional groups known to form stable complexes with a specific ion and less stable complexes with other cations. Prior investigator's approaches for making templated resins for metal ions have had marginal success. We have extended and amended these methodologies in our work with Pb(II) …
Date:
2001-04~
Creator:
Murray, George M.; Uy, O. Manual; Zeng, Xiangfei; Bae, Sue Y.; Bzhelyanskiy, Anton & Kimaro, A.
Object Type:
Report
System:
The UNT Digital Library
Review of Bioassays for Monitoring Fate and Transport ofEstrogenic Endocrine Disrupting Compounds in Water
Endocrine disrupting compounds (EDCs) are recognizedcontaminants threatening water quality. Despite efforts in sourceidentification, few strategies exist for characterization or treatment ofthis environmental pollution. Given that there are numerous EDCs that cannegatively affect humans and wildlife, general screening techniques likebioassays and biosensors provide an essential rapid and intensiveanalysis capacity. Commonly applied bioassays include the ELISA and YESassays, but promising technologies include ER-CALUXa, ELRA, Endotecta,RIANA, and IR-bioamplification. Two biosensors, Endotecta and RIANA, arefield portable using non-cellular biological detection strategies.Environmental management of EDCs in water requires integration ofbiosensors and bioassays for monitoring and assessment.
Date:
January 30, 2004
Creator:
Campbell, Chris G.; Borglin, Sharon E.; Stringfellow, William T.; Green, F. Bailey & Grayson, Allen
Object Type:
Report
System:
The UNT Digital Library
Spin Effects in the Fragmentation of Transversely Polarized and Unpolarized Quarks.
We study the fragmentation of a transversely polarized quark into a non-collinear (k{perpendicular} {ne} 0) spinless hadron and the fragmentation of an unpolarized quark into a non collinear transversely polarized spin 1/2 baryon. These nonperturbative properties are described by spin and k{perpendicular} dependent fragmentation functions and are revealed in the observation of single spin asymmetries. Recent data on the production of pions in polarized semi-inclusive DIS and long known data on A polarization in unpolarized p-N processes are considered: these new fragmentation functions can describe the experimental results and the single spin effects in the quark fragmentation turn out to be surprisingly large.
Date:
April 23, 2001
Creator:
Anselmino, M.; Boer, D.; D'Alesio, U. & Murgia, F.
Object Type:
Article
System:
The UNT Digital Library
Focused ion beam damage to MOS integrated circuits
Commercial focused ion beam (FIB) systems are commonly used to image integrated circuits (ICS) after device processing, especially in failure analysis applications. FIB systems are also often employed to repair faults in metal lines for otherwise functioning ICS, and are being evaluated for applications in film deposition and nanofabrication. A problem that is often seen in FIB imaging and repair is that ICS can be damaged during the exposure process. This can result in degraded response or out-right circuit failure. Because FIB processes typically require the surface of an IC to be exposed to an intense beam of 30--50 keV Ga{sup +} ions, both charging and secondary radiation damage are potential concerns. In previous studies, both types of effects have been suggested as possible causes of device degradation, depending on the type of device examined and/or the bias conditions. Understanding the causes of this damage is important for ICS that are imaged or repaired by a FIB between manufacture and operation, since the performance and reliability of a given IC is otherwise at risk in subsequent system application. In this summary, the authors discuss the relative roles of radiation damage and charging effects during FIB imaging. Data from exposures of …
Date:
May 10, 2000
Creator:
Fleetwood, D. M.; Campbell, Ann N.; Hembree, Charles E.; Tangyunyong, Paiboon; Jessing, Jeffrey R. & Soden, Jerry M.
Object Type:
Article
System:
The UNT Digital Library
Object-Oriented Process Modeling for Material-at-Risk Estimation
None
Date:
June 1, 2001
Creator:
Kornreich, D. E.
Object Type:
Article
System:
The UNT Digital Library
Preliminary Investigation of the Thermal Decomposition of Ablefoam and EF-AR20 Foam (Ablefoam Replacement)
Preliminary thermal decomposition experiments with Ablefoam and EF-AR20 foam (Ablefoam replacement) were done to determine the important chemical and associated physical phenomena that should be investigated to develop the foam decomposition chemistry sub-models that are required in numerical simulations of the fire-induced response of foam-filled engineered systems for nuclear safety applications. Although the two epoxy foams are physically and chemically similar, the thermal decomposition of each foam involves different chemical mechanisms, and the associated physical behavior of the foams, particularly ''foaming'' and ''liquefaction,'' have significant implications for modeling. A simplified decomposition chemistry sub-model is suggested that, subject to certain caveats, may be appropriate for ''scoping-type'' calculations.
Date:
January 1, 2002
Creator:
Ulibarri, Tamara A.; Derzon, Dora K.; Erickson, Kenneth L.; Castaneda, Jaime N.; Borek, Theodore T., III; Renlund, Anita M. et al.
Object Type:
Report
System:
The UNT Digital Library
Attempt to confirm superheavy element production in the 48Ca +238U reaction
An attempt to confirm production of superheavy elements in the reaction of 48Ca beams with actinide targets has been performed using the 238U(48Ca,3n)283112 reaction. Two 48Ca projectile energies were used, that spanned the energy range where the largest cross sections have been reported for this reaction. No spontaneous fission events were observed. No alpha decay chains consistent with either reported or theoretically predicted element 112 decay properties were observed. The cross section limits reached are significantly smaller than the recently reported cross sections.
Date:
March 24, 2005
Creator:
Gregorich, K. E.; Loveland, W.; Peterson, D.; Zielinski, P. M.; Nelson, S. L.; Chung, Y. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Confirmation of production of element 110 by the (208)Pb(64-Ni,n) reaction
We report the experimental confirmation of the production of element110. In the bombardment of a 208Pb target with a 309~MeV 64Ni beam, we have observed two chains of time- and position-correlated events. Each chain consisted of the implantation of an evaporation residue followed by the emission of alpha-particles. We attribute these two chains to the decay of 271-110 produced with a cross section of 8.3 (+11/-5.3)pb.
Date:
December 8, 2002
Creator:
Ginter, T. N.; Gregorich, K. E.; Loveland, W.; Lee, D. M.; Kirbach, U. W.; Sudowe, R. et al.
Object Type:
Article
System:
The UNT Digital Library
The cyro-thermochromatographic separator (CTS): A new detectionand separation system for highly volatile osmium and hassium (element108) tetroxides
We implemented a new concept for heavy element chemistry research using an ion separator to separate the desired products from the beam, transfer products and other undesirable by-products prior to chemical studies. First, a Recoil product Transfer Chamber (RTC) was designed and attached to the Berkeley Gas-filled Separator (BGS) to collect and transfer the recoiling products to the chemical separation system. The RTC consists of a wire-grid-supported thin mylar foil ({le}) 200 {micro}g/cm{sup 2} that separates the BGS detector chamber, at 1.3 mbar pressure, from the chemistry system at different pressures ranging from 480 mbar to 2000 mbar. The overall transport efficiency ranged between 30% and 15%, compared to the activity measured in the focal plane detector of the BGS. The CTS was designed as a separation and {alpha}-decay detection system for the highly volatile tetroxides of osmium and hassium, element 108. The CTS, shown in figure 1, consists of two rows of 32-{alpha} detectors arranged along a negative temperature gradient. The tetroxides adsorb on the surface of one of the silicone photodiodes at a certain deposition temperature, and the nuclide is then identified by the {alpha}-decay. To test the CTS with the expected hassium homologue osmium, different {alpha}-active osmium …
Date:
March 8, 2002
Creator:
Kirbach, U. W.; Folden, C. M., III; Ginter, T. N.; Gregorich, K. E.; Lee, D. M.; Ninov, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Entrance-channel effects in odd-Z tranactinide compound nucleus reactions
Swiatecki, Siwek-Wilczynska, and Wilczynski's 'Fusion By Diffusion' description [1] of transactinide (TAN) compound nucleus (CN) formation utilizes a three-step model. The first step is the 'sticking', or capture, which can be calculated relatively accurately. The second step is the probability for the formation of a CN by 'diffusion' analogous to that of Brownian motion. Lastly, there exists the probability of the CN 'surviving' deexcitation by neutron emission, which competes with fission and other de-excitation modes. This model predicts and reproduces cross sections typically within a factor of two. Producing the same CN with different projectile-target pairs is a very sensitive way to test entrance channel effects on heavy element production cross sections. If the same CN is produced at or near the same excitation energy the survival portion of the theory is nearly identical for the two reactions. This method can be used as a critical test of the novel 'diffusion' portion of the model. The reactions producing odd-Z TAN CN such as Db, Bh, Mt, and Rg (Z = 105, 107, 109, and 111, respectively) were first studied using even-Z projectiles on {sup 209}Bi targets (as opposed to odd-Z projectiles on {sup 208}Pb targets) because lower effective fissility [2] …
Date:
September 1, 2007
Creator:
Nelson, S. L.; Gregorich, K. E.; Dragojevic, I.; Dullmann, Ch. E.; Eichler, R.; Folden, C. M., III et al.
Object Type:
Article
System:
The UNT Digital Library
Excitation function for the production of 262Bh (Z = 107) in theodd-Z projectile reaction 208Pb(55Mn, n)
The excitation function for production of 262Bh in the odd-Z-projectile reaction 208Pb(55Mn,n) has been measured at three projectile energies using the Berkeley Gas-filled Separator at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. In total, 33 decay chains originating from 262Bh and 2 decay chains originating from 261Bh were observed. The measured decay properties are in good agreement with previous reports. The maximum cross section of 540 +180 - 150 pb is observed at a lab-frame center-of-target energy of 264.0 MeV and is more than fives times larger than that expected based on previously reported results for production of 262Bh in the analogous even-Z-projectile reaction 209Bi(54Cr,n). Our results indicate that the optimum beam energy in one-neutron-out heavy-ion fusion reactions can be estimated simply using the ''Optimum Energy Rule'' proposed by Swiatecki, Siwek-Wilczynska, and Wilczynski.
Date:
May 16, 2005
Creator:
Folden, C. M., III; Nelson, S. L.; Dullmann, Ch. E.; Schwantes, J. M.; Sudowe, R.; Zielinski, P. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Influence of projectile neutron number on cross section in cold fusion reactions
Elements 107-112 [1,2] have been discovered in reactions between {sup 208}Pb or {sup 209}Bi targets and projectiles ranging from {sup 54}Cr through {sup 70}Zn. In such reactions, the compound nucleus can be formed at excitation energies as low as {approx}12 MeV, thus this type of reaction has been referred to as 'cold fusion'. The study of cold fusion reactions is an indispensable approach to gaining a better understanding of heavy element formation and decay. A theoretical model that successfully predicts not only the magnitudes of cold fusion cross sections, but also the shapes of excitation functions and the cross section ratios between various reaction pairs was recently developed by Swiatecki, Siwek-Wilczynska, and Wilczynski [3,4]. This theoretical model, also referred to as Fusion by Diffusion, has been the guide in all of our cold fusion studies. One particularly interesting aspect of this model is the large predicted difference in cross sections between projectiles differing by two neutrons. The projectile pair where this difference is predicted to be largest is {sup 48}Ti and {sup 50}Ti. To test and extend this model, {sup 208}Pb({sup 48}Ti,n){sup 255}Rf and {sup 208}Pb({sup 50}Ti,n){sup 257}Rf excitation functions were recently measured at the Lawrence Berkeley National Laboratory's (LBNL) …
Date:
September 1, 2007
Creator:
Dragojevic, Irena; Dragojevic, I.; Gregorich, K. E.; Dullmann, Ch. E.; Folden, C. M., III; Garcia, M. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Level structure of 141Ba and 139Xe and the level systematics of N=85 even-odd isotones
New level schemes of {sup 141}Ba and {sup 139}Xe are proposed from the analyses of spontaneous-fission gamma data from our {sup 252}Cf spontaneous fission Gammasphere runs of 1995 and 2000. By analogy with the N = 85 even-odd isotones {sup 149}Gd, {sup 147}Sm, and {sup 145}Nd, spins and parities were assigned to the observed excited states in {sup 141}Ba and {sup 139}Xe. It appears that spherical shell model neutron excitations plus octupolephonons are an appropriate basis at the lower end of the bands. Going to higher spins it is clear that the soft rotor involving valence protons as well as neutrons becomes increasingly important in the configurations. Level systematics in the N = 85 even-odd isotones from Gd(Z=64) through Te(Z=52), are discussed. The excitation systematics and smooth trends of the analogous levels support the spin and parity assignment for excited levels observed in {sup 141}Ba and {sup 139}Xe. The level systematics and the comparison with neighboring even-even isotopes indicate that quadrupole and octupole collectivity play roles in {sup 141}Ba and {sup 139}$Xe. From Gd(Z=64) through Te(Z=52), increasing excitation energies of the 13/2{sup +} states and lowering relative intensities of the positive parity bands in the N = 85 even-odd isotones …
Date:
January 31, 2002
Creator:
Luo, Y. X.; Rasmussen, J. O.; Hamilton, J. H.; Ramayya, A. V.; Hwang, J. K.; Beyer, C. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Synthesis of rutherfordium isotopes in the 238U(26Mg, xn)264-xRf reaction and study of their decay properties
Isotopes of rutherfordium (258-261Rf) were produced in irradiations of 238U targets with 26Mg beams. Excitation functions were measured for the 4n, 5n and 6n exit channels. Production of 261Rf in the 3n exit channel with a cross section of 28+92-26 pb was observed. Alpha decay of 258Rf was observed for the first time with an alpha-particle energy of 9.05+-0.03 MeV and an alpha/total decay branching ratio of 0.31+-0.11. In 259Rf, the electron capture/total decay branching ratio was measured to be 0.15+-0.04. The measured half-lives for 258Rf, 259Rf and 260Rf were 14.7+1.2-1.0 ms, 2.5+0.4-0.3 s and 22.2+3.0-2.4 ms, respectively, in agreement with literature data. The systematics of the alpha decay Q values and of the partial spontaneous fission half-lives were evaluated for even-even nuclides in the region of the N = 152, Z = 100 deformed shell. The influence of the N = 152 shell on the alpha decay Q values for rutherfordium was observed to be similar to that of the lighter elements (96<_ Z<_ 102). However, the N = 152 shell does not stabilize the rutherfordium isotopes against spontaneous fission, as it does in the lighter elements (96<_ Z<_102).
Date:
January 15, 2008
Creator:
Gates, Jacklyn M.; Gates, J. M.; Garcia, M. A.; Gregorich, K. E.; Dullmann, Ch. E.; Dragojevic, I. et al.
Object Type:
Article
System:
The UNT Digital Library
Energy confinement and magnetic field generation in the SSPX spheromak
The Sustained Spheromak Physics Experiment (SSPX) [E.B. Hooper, et. al., Nuclear Fusion, Vol. 39, No. 7] explores the physics of efficient magnetic field buildup and energy confinement, both essential parts of advancing the spheromak concept. Extending the spheromak formation phase increases the efficiency of magnetic field generation with the maximum edge magnetic field for a given injector current (B/I) from 0.65 T/MA previously to 0.9 T/MA. We have achieved the highest electron temperatures (T{sub e}) recorded for a spheromak with T{sub e} > 500 eV, toroidal magnetic field {approx}1 T and toroidal current ({approx}1 MA) [R.D. Wood, D.N. Hill, H.S. McLean, E.B. Hooper, B.F. Hudson, J.M. Moller, 'Improved magnetic field generation efficiency and higher temperature spheromak plasmas', submitted to Physical Review Letters]. Extending the sustainment phase to > 8 ms extends the period of low magnetic fluctuations (< 1 %) by 50%. The NIMROD 3-D resistive MHD code [C.R. Sovinec, T.A. Gianakon, E.D. Held, S.E. Kruger and D.D. Schnack, The NIMROD Team, Phys. Plasmas 10, 1727 (2003)] reproduces the observed flux amplification {Psi}{sub pol}/{Psi}{sub gun}. Successive gun pulses are demonstrated to maintain the magnetic field in a quasi-steady state against resistive decay. Initial measurements of neutral particle flux in multi-pulse …
Date:
February 11, 2008
Creator:
Hudson, B.; McLean, H. S.; Wood, R. D.; Hooper, E. B.; Hill, D. N.; Jayakumar, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Investigation of the Statistical Properties of Stable Eu Nuclei using Neutron-Capture Reactions
Neutron capture for incident neutron energies <1eV up to 100 keV has been measured for {sup 151,153}Eu targets. The highly efficient DANCE (Detector for Advanced Neutron Capture Experiments) array coupled with the intense neutron beam at Los Alamos Neutron Science Center is used for the experiment. Stable Eu isotopes mass separated and electroplated on Be backings were used. Properties of well-resolved, strong resonances in two Eu nuclei are examined. The parameters for most of these resonances are known. Detailed multiplicity information for each resonance is obtained employing the high granularity of the DANCE array. The radiative decay cascades corresponding to each resonance are obtained in the experiment. The measurements are compared to simulation of these cascades which calculated with various models for the radiative strength function. Comparison between the experimental data and simulation provides an opportunity to investigate the average quantities.
Date:
October 4, 2005
Creator:
Agvaanluvsan, U.; Alpizar-Vicente, A.; Becker, J. A.; Becvar, F.; Bredeweg, T. A.; Clement, R. et al.
Object Type:
Article
System:
The UNT Digital Library
New isotope 264Sg and decay properties of 262-264Sg
New isotope, 264Sg, was identified using the38U(30Si,xn)268-xSg reaction and excitation functions for 262-264Sg weremeasured. 264Sg decays by spontaneous fission with a half life of 37+27/-11 ms. The spontaneous fission branch for 0.9-s 263Sg was measuredfor the first time and found to be (13+-8) percent. 262Sg decays byspontaneous fission with a 15 +5/-3 ms half-life. Spontaneous fissionpartial half-life systematics are evaluated for even-even Sg isotopesfrom 258Sg through 266Sg, spanning the transition region between theN=152, Z=100 and N=162, Z=108 deformed shells.
Date:
June 20, 2006
Creator:
Gregorich, K. E.; Gates, J. M.; Duellmann, Ch. E.; Sudowe, R.; Nelson, S. L.; Garcia, M. A. et al.
Object Type:
Article
System:
The UNT Digital Library