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Development of thin foils for use in generating neutral particle beams
The Isotope Research Materials Laboratory (IRML) was requested to prepare large-area, ultrathin aluminum and carbon foils for use in beam neutralization experiments. There were two major parts to this request. The first was to immediately provide a number of 5-cm-dia foils 5 to 20 ..mu..g/cm/sup 2/ thick for use in experiments at the Fusion Materials Irradiation Test (FMIT) facility and at Argonne National Laboratory (ANL). The second, longer-term request was to develop methods to prepare 25-cm x 25-cm, 10-..mu..g/cm/sup 2/ aluminum neutralizer foils. Both parts of the request have been successfully met.
Date:
January 1, 1986
Creator:
Aaron, W. S.; Zevenbergen, L. A.; Adair, H. L.; Culpepper, C. A.; McCulla, W. H.; Nolan, T. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Preparation of thin films for use in generating neutral particle beams
Large-area, thin aluminum foils were prepared for use in beam neutralization experiments. The foils were made using either electron beams of resistance heating. Foil thickness and uniformity were determined using alpha particles. The foils perform very well when bombarded by energetic H/sup -/ ions. (DLC)
Date:
January 1, 1986
Creator:
Aaron, W.S.; Zevenbergen, L.A. & Adair, H.L.
Object Type:
Article
System:
The UNT Digital Library
Limit on tau neutrino mass
Using the complete data sample of 300 pb/sup -1/ collected by the HRS spectrometer in e/sup +/e/sup -/ collisions at 29 GeV, mass limit for the tau neutrino is set. The end point of the hadronic mass spectrum is determined in the decays tau ..-->.. 5..pi../sup + -/nu/sub tau/ and tau ..-->.. 5..pi../sup + -/..pi../sup 0/nu/sub tau/. At 95% confidence level, an upper limit of M/sub nu/sub tau// < 76 MeV/c/sup 2/, is found. 8 refs., 4 figs.
Date:
January 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Beltrami, I.; Blockus, D.; Bonvicini, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Charm D production in e/sup +/e/sup -/ annihilation at 29 GeV
Results are presented on the analysis of charm D Production from 300 pb/sup -1/ of data taken with the HRS Detector at PEP. The electroweak asymmetry is -8.4 +- 3.6% and R (D + D*) = 1.57 +- 0.17. Fragmentation functions for D/sup 0/, D/sup +/, D*/sup +/ production and the results of a search for the D** are given. 10 refs., 9 figs.
Date:
January 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Limit on tau decay to 7-charged tracks
Using the complete data sample of 300 pb/sup -1/ from e/sup +/e/sup -/ collisions at 29 GeV, the HRS collaboration has searched for tau decay to 7 charged particles and any number of neutrals. No events were found. The corresponding upper limit to the branching ratio is B(tau ..-->.. 7..pi../sup + -/ + n..gamma.. + nu/sub tau/) < 3.8 x 10/sup -4/ at 90% confidence level. Using the final HRS data sample we also report updated branching ratios for tau ..-->.. 5..pi../sup + -/ + nu/sub tau/ and tau ..-->.. 5..pi../sup + -/ + ..pi../sup 0/ + nu/sub tau/.
Date:
January 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the D/sup 0/ meson lifetime
We report the measurement of the lifetime of the D/sup 0/ meson. The direct observation of the decay vertex distribution in the process D/sup 0/ ..-->.. K/sup -/..pi../sup +/ was made using a vertex chamber installed in the HRS detector at PEP. The measured lifetime is found to be tau/sub D/sup 0// = .42 +- .09 +- .06ps. 5 refs., 4 figs.
Date:
January 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the electroweak asymmetry in the reaction e/sup +/e/sup -/. -->. tau/sup +/tau/sup -/ at 29 GeV
This paper reports the electroweak asymmetry in the reaction e/sup +/e/sup -/ ..-->.. tau/sup +/tau/sup -/ at 29 GeV. The results came from data taken with the High Resolution Spectrometer at PEP corresponding to an integrated luminosity of 256 pb/sup -1/. The 7372 observed events give A/sub tau tau/ = -(4.4 +- 1.4 +- 0.5)%. Events selected in the central region of the detector measure a total cross section of R/sub tau tau/ = 1.06 +- 0.02 +- 0.04. 5 refs., 1 fig.
Date:
June 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Multiplicity distributions in e/sup +/e/sup -/ annihilation at 29 GeV: a comparison with hadronic data
The charged particle multiplicity distributions for single jets in e/sup +/e/sup -/ annihilation at 29 GeV have been measured using the High Resolution Spectrometer at PEP. The shape of the distribution agrees well with a Poisson distribution. No correlation is observed between the multiplicities in the two jets of an event. For fixed values of the prong number of the total event, the multiplicity sharing between the two jets is in good agreement with a binomial distribution. These observations are contrasted to the results from soft hadronic collisions and conclusions are drawn about the nature of clusters. 21 refs., 4 figs.
Date:
June 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for spin-dependent effects in c-quark fragmentation
Events of the reaction e/sup +/e/sup -/ ..-->.. c anti c at 29 GeV were isolated by observing D* mesons through D*/sup +/ ..-->.. D/sup 0/..pi../sup +/ decay. The D/sup 0/ decay modes used are D/sup 0/ ..-->.. K..pi.., K3..pi.., and K..pi..(..pi../sup 0/). The data, which correspond to an integrated luminosity of 300 pb/sup -1/, were collected by the High Resolution Spectrometer at PEP. All angular distributions examined are consistent with being isotropic; there is no evidence for D* alignment in the e/sup +/e/sup -/ reaction. 6 refs., 9 figs.
Date:
1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Upper limit on the D*(2010) decay width
We report a measurement of the upper limit of the decay width for the D*/sup +/(2010) meson using the High Resolution Spectrometer at PEP. We observed the charged D* production in the decay mode of D*/sup +/ ..-->.. D/sup 0/..pi../sup +/ with the D/sup 0/ decaying into the K/sup -/..pi../sup +/ mode. The peak in the mass difference distribution M(K/sup -/..pi../sup +/..pi../sup +/)-M(K/sup -/..pi../sup +/) was used to directly measure the decay width. The width is dominated by the detector resolution and the preliminary result is an upper limit on the full width of GAMMA/sub D*/ < 1.15 MeV/c/sup 2/ at 90% C.L. 7 refs., 2 figs.
Date:
June 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the tau lepton lifetime
We report the measurement of the lifetime of the tau lepton. This measurement was made using the HRS spectrometer at PEP, operating at 29 GeV. The 3 prong decay vertices were measured using a four layer tubular cell vertex chamber. The lifetime of the tau was determined to be tau/sub tau/ = .28 +- .02 +- .02 ps. 7 refs., 3 figs.
Date:
January 1, 1986
Creator:
Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J.M. et al.
Object Type:
Report
System:
The UNT Digital Library
Search for wrong sign D/sup 0/ decays with the HRS detector
Using a data sample corresponding to an integrated luminosity of 300pb/sup -1/ obtained at PEP with the HRS detector we have searched for the wrong sign decay of D/sup 0/ mesons in the decays D* ..-->.. D/sup 0/..pi... We obtain a 90% confidence level limit of 4.0% on the ratio of the wrong sign to the right sign decay rate in the K..pi.. mode. This is the best model independent limit on mixing currently available and constrains the nature of the wrong sign signal recently reported by the MARK III group. 10 refs., 2 figs.
Date:
1986
Creator:
Abachi, S.; Akerlof, C.; Barringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.
Object Type:
Report
System:
The UNT Digital Library
Asymmetry in the angular distribution of inclusive A baryons from e/sup +/e/sup -/ annihilations at. sqrt. s = 29 GeV
The forward-backward asymmetry A expected from the ..gamma.. - Z/sup 0/ interference term in the process e/sup +/e/sup -/ ..-->.. q anti q is observed in the lab production angular distribution of high momentum A baryons. The data were collected with the High Resolution Spectrometer at PEP and an integrated luminosity of 256 pb/sup -1/ at ..sqrt..s = 29 GeV was used in the analysis. The asymmetry is seen to increase with the fractional energy z = 2E/..sqrt..s of the A due to the decreasing presence of nonleading particles. The value obtained for A baryons with z greater than or equal to 0.3 is A = -0.22 +- 0.08 +- 0.02.
Date:
May 1986
Creator:
Abachi, S.; Baringer, P.; Beltrami, I.; Bylsma, B. G.; DeBonte, R.; Koltick, D. et al.
Object Type:
Article
System:
The UNT Digital Library
lambda. production in e/sup +/e/sup -/ annihilations at 29 GeV
This paper presents measurements of the inclusive production cross sections of ..lambda.. baryons in e/sup +/e/sup -/ annihilations at ..sqrt..s = 29 GeV. The data sample corresponds to an integrated luminosity of 256 pb/sup -1/ collected with the High Resolution Spectrometer at PEP. Comparisons are made to the predictions of the Lund model. The data are well described using a strange diquark suppression parameter, (us/ud)/(s/d), of 0.89 +- 0.10/sub -0.16//sup +0.56/, and the measured ..lambda../sub c/ ..-->.. ..lambda.. + X branching ratio of 23 +- 10%. No polarization is observed in the ..lambda.. decays. 17 refs., 5 figs.
Date:
May 1, 1986
Creator:
Abachi, S.; Baringer, P.; Beltrami, I.; Bylsma, B.G.; DeBonte, R.; Koltick, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Observation of tensor and scalar mesons produced in e/sup +/e/sup -/ annihilation at 29 GeV
The production of the tensor mesons, integral/sup 0/(1270) and K*/sup 0/(1430), and the scalar meson S(975) have been observed in e/sup +/e/sup -/ annihilation at 29 GeV center of mass energy, using data obtained with the HRS detector at the PEP storage ring. The mean multiplicities for meson momenta greater than 1450 MeV/c are <n/sub f/sup 0//> = 0.11 +- 0.04, <n/sub K*/sup 0/(1430)/> = 0.10 +- 0.06, and <n/sub S/> = 0.05 +- 0.02 per hadronic event. The fragmentation functions of the tensor mesons are in good agreement with the predictions of the Webber cluster model. The possibility of a large strange quark component in the S meson structure is suggested by the data.
Date:
January 1, 1986
Creator:
Abachi, S.; Baringer, P.; Bylsma, B. G.; DeBonte, R.; Koltick, D.; Loeffler, F. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Physical inventory verification exercise for a highly enriched uranium fabrication facility
The International Atomic Energy Agency, in collaboration with the US Support Program (POTAS), has developed and conducted a training exercise simulating a physical inventory verification (PIV) at a highly enriched uranium (HEU) fabrication facility. This exercise is part of a series sponsored by the POTAS program, including PIVs at light-water reactors and plutonium fabrication facilities. The first HEU exercise took place in September 1985 at Los Alamos National Laboratory and a second is scheduled for Spring, 1987 at JRC, ISPRA. The main objectives of these exercises are: to provide the opportunity for inspectors to test and evaluate the use of nondestructive assay (NDA) equipment and computer software under conditions similar to those found during actual inspections; to use the data generated to evaluate different inspection procedures and strategies; and to exchange ideas on PIV procedures between the three operations divisions. Because the exercises are conducted in a neutral environment, free of the time pressure often found in actual inspections, it is possible for the inspectors to achieve the course objectives.
Date:
January 1, 1986
Creator:
Abedin-Zadeh, R. & Augustson, R.H.
Object Type:
Article
System:
The UNT Digital Library
Technology development for the design of shallow land burial facilities at semiarid sites
The following topics are discussed: effectiveness of a moisture barrier, physical basis for capillary barriers, trench cap designs for long-term stabilization, biointrusion barrier testing, and joint DOE/NRC tracer migration experiment. (LM)
Date:
January 1, 1986
Creator:
Abeele, W. V.; Nyhan, J. W. & Drennon, B. J.
Object Type:
Article
System:
The UNT Digital Library
Consolidation and shear failure leading to subsidence and settlement. Final report
Subsidence and settlement are phenomena that are much more destructive than generally thought. In shallow land burials they may lead to cracking of the overburden and eventual exposure and escape of waste material. The primary causes are consolidation and cave-ins. Laboratory studies performed at Los Alamos permit us to predict settlement caused by consolidation or natural compaction of the crushed tuff overburden. We have also investigated the shear failure characteristics of crushed tuff that may lead to subsidence. Examples of expected settlement and subsidence are calculated based on the known geotechnical characteristics of crushed tuff. The same thing is done for bentonite/tuff mixes because some field experiments were performed using this additive (bentonite) to reduce the hydraulic conductivity of the crushed tuff. Remedial actions, i.e., means to limit the amount of settlement, are discussed. We finally discuss our field experiment, which studies the influence of subsidence on layered systems in general and on biobarriers in particular. The share of the produced cavities is compared with cavities produced by idealized voids in an idealized environment. Study of root penetration at subsidence sites gives us an indication of the remaining degree of integrity. 30 refs., 24 figs., 19 tabs.
Date:
February 1, 1986
Creator:
Abeele, W.; Nyhan, J. W.; Hakonson, T. E.; Drennon, B. J.; Lopez, E. A.; Herrera, W. J. et al.
Object Type:
Report
System:
The UNT Digital Library
Low-level integrated system test
An unusually wet season permitted us to test the integrity of our biobarrier installed in the improved or modified plots in our integrated system. Although the modified plots had a reduced water-holding capacity, they delivered leachate only at the drain installed above the biobarrier, demonstrating once more that the biobarrier is behaving successfully as a capillary barrier in rerouting the subsurface flow around the tuff beneath the biobarrier. As a result of vertical water flow impedance, more water was made available to plot vegetation, enhancing its growth dramatically. The capillary barrier theory was backed up by the tensiometer results showing saturation at the upper biobarrier interface. 11 refs., 19 figs
Date:
February 1, 1986
Creator:
Abeele, Willy; Nyhan, John; Hakonson, Tom; Drennon, Barry J.; Lopez, Edward A.; Herrera, Wilfred J. et al.
Object Type:
Report
System:
The UNT Digital Library
Exchange of bonded hydrogen in amorphous silicon by deuterium
We show that bonded hydrogen in a-Si:H is readily exchanged by atomic deuterium when exposed to a deuterium plasma discharge. The effective diffusion coefficient for the D,H exchange 10/sup -14/ cm/sup 2//sec at 160/sup 0/C, is comparable to that of interstitial hydrogen in c-Si.
Date:
December 1, 1986
Creator:
Abeles, B.; Yang, L.; Leta, D.P. & Majkrzak, C.F.
Object Type:
Article
System:
The UNT Digital Library
NMR investigations of aging effects in palladium tritide
Using pulsed NMR techniques, relaxation times for triton, proton, and /sup 3/He nuclei in recently synthesized PdH/sub x/ and PdT/sub x/ samples were measured as a function of temperature in the range 100 less than or equal to T less than or equal to 300/sup 0/K. Rigid lattice second moments (T approx. = 100/sup 0/K) were also determined. These results provide baseline information for an extended study of aging effects of PdT/sub x/. 6 refs., 7 figs., 2 tabs.
Date:
January 1, 1986
Creator:
Abell, G.C. & Attalla, A.
Object Type:
Article
System:
The UNT Digital Library
Stress corrosion cracking tests on high-level-waste container materials in simulated tuff repository environments
Types 304L, 316L, and 321 austenitic stainless steel and Incoloy 825 are being considered as candidate container materials for emplacing high-level waste in a tuff repository. The stress corrosion cracking susceptibility of these materials under simulated tuff repository conditions was evaluated by using the notched C-ring method. The tests were conducted in boiling synthetic groundwater as well as in the steam/air phase above the boiling solutions. All specimens were in contact with crushed Topopah Spring tuff. The investigation showed that microcracks are frequently observed after testing as a result of stress corrosion cracking or intergranular attack. Results showing changes in water chemistry during test are also presented.
Date:
June 1, 1986
Creator:
Abraham, T.; Jain, H. & Soo, P.
Object Type:
Report
System:
The UNT Digital Library
User systems guidelines for software projects
This manual presents guidelines for software standards which were developed so that software project-development teams and management involved in approving the software could have a generalized view of all phases in the software production procedure and the steps involved in completing each phase. Guidelines are presented for six phases of software development: project definition, building a user interface, designing software, writing code, testing code, and preparing software documentation. The discussions for each phase include examples illustrating the recommended guidelines. 45 refs. (DWL)
Date:
April 1, 1986
Creator:
Abrahamson, L. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Transport and Reaction Kinetics at the Glass:Solution Interface Region: Results of Repository-Oriented Leaching Experiments
Repository-oriented leaching experiments involving Savannah River Laboratory (SRL) 165 type glass under a {gamma}-radiation field (1 = 0.2 x 10{sup 4} R/h) have been performed by the Nevada Nuclear Waste Storage Investigations (NNWSI) project. In this communication, we discuss glass surface analyses obtained by SEM, nuclear resonance profiling, and SIMS together with leachate solution data in relation to a mechanism that couples diffusion, hydrolysis (etching and gelation), and precipitation to qualitatively describe the release of different glass components to the leachant solutions. The release of mobile (e.g., Li) and partly mobile (e.g., B) species is controlled primarily by interdiffusion with water species across the interdiffusion zone. Glass components that are immobile in the interdiffusion zone are released to the solution by etching. For prediction of long-term steady-state concentrations of glass components with low solubility, the relative rates of release from the glass and secondary mineral precipitation must be taken into account.
Date:
December 31, 1986
Creator:
Abrajano, T. A., Jr. & Bates, J. K.
Object Type:
Report
System:
The UNT Digital Library