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(Particle physics)

Description: This report briefly discusses the following topics: rare and forbidden eta meson and muon decays to test the standard model; tests of charge symmetry and isospin invariance; studies of baryon resonances; and exploratory investigations in support of the previous programs. (LSP)
Date: July 1, 1990
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fermilab Physics Department TVC chip

Description: The Electronics Group in the Physics Department at Fermilab has designed and has had produced 20 prototypes of a full custom four channel time to voltage converter using the ES2 direct write 2 {mu}m CMOS process. The actual implementation of the design was performed under contract by ASIC designs Inc. of Naperville, Illinois. Each channel has two hit capability and one level of input buffering: that is, up to four voltages representing time internals can be stored from each input for later ADC … more
Date: July 1, 1990
Creator: Hansen, S. & Cotta-Ramusino, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Progress report of a research program in computational physics

Description: Task D's research is focused on the understanding of elementary particle physics through the techniques of quantum field theory. We make intensive use of computers to aid our research. During the last year we have made significant progress in understanding the weak interactions through the use of Monte Carlo methods as applied to the equations of quenched lattice QCD. We have launched a program to understand full (not quenched) lattice QCD on relatively large lattices using massively parallel c… more
Date: July 1, 1990
Creator: Guralnik, Gerald S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Physics of hot hadronic matter and quark-gluon plasma

Description: This Introductory talk contains a brief review of the current status of theoretical and experimental activities related to physics of superdense matter. In particular, we discuss latest lattice results on the phase transition, recent progress in chiral symmetry physics based on the theory of interacting instantons, new in the theory of QGP and of hot hadronic matter, mean p{sub t} and collective flow, the shape of p{sub t} distribution, strangeness production, J/{psi} suppression and {phi} enha… more
Date: July 1, 1990
Creator: Shuryak, E.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress report of a research program in experimental high energy physics

Description: An experimental program in strong and electro-weak interaction physics of elementary particles is being carried out using electronic detection techniques. Experiments have been performed at Brown, Brookhaven, and Fermilab. The work described in this report by the Electronic Detector Group addresses the following: neutrino interactions and intrinsic properties, preparations for experiments ( D--ZERO'') at the FNAL 2 TeV {bar p}p Collider, new detection techniques for neutrino properties.
Date: July 1, 1990
Creator: Lanou, R.E. Jr. & Cutts, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research program in experimental high energy physics, Task B

Description: Two prototype tracking system modules of the LVD detector have been produced by the direct-mount method and tested. The direct-mount procedure was proposed by a subgroup (mainly US) of the LVD Collaboration. This method has the advantages over the previous (hood) design of greater signal-to-noise ratio, of providing spacing between the two streamer chamber layers of each tracking plane to improve track reconstruction and angular resoluation, economy and speed of production. The tests have shown… more
Date: July 1, 1990
Creator: Widgoff, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Atomic physics of highly charged ions in an electron beam ion trap

Description: Two electron beam ion traps are in use at LLNL for the purpose of studying the properties of very highly charged ions and their interactions with electrons. This paper reviews the operation of the traps and discusses recent experiments in three areas: precision transition energy measurements in the limit of very high ion charge, dielectronic recombination measurements for the He-like isoelectronic sequence, and measurements of x-ray polarization. 22 refs., 11 figs., 1 tab.
Date: July 1, 1990
Creator: Marrs, R.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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From the neutron to three light neutrino species: Some highlights from sixty years of particle physics

Description: I consider the beginning to modern particle physics to be in 1932--33, when James Chadwick discovered the neutron at Cambridge, England, and Carl Anderson discovered the positron in Pasadena, California. I leave out the discoveries of the electron by J. J. Thomson, the nucleus and the proton by Ernest Rutherford, as well as the photon introduced by Albert Einstein and the neutrino as hypothesized by Wolfgang Pauli, as having occurred before my time.'' I was thus able to follow -- and sometimes … more
Date: July 1, 1990
Creator: Goldhaber, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Discrete Gravity

Description: This paper discusses the following: constructing a bit-string universe; quantized space-time; combinatorial hierarchy labels; gravitational stabilization of the proton; quantum geons; cosmological consequences; the proton-electron mass ratio, weak- electromagnetic unification; and sewgut. (LSP)
Date: July 1, 1990
Creator: Noyes, H. Pierre
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Concept for an experiment on particle and jet production at midrapidity

Description: The concept for an experiment to study global event signatures of quark Gluon Plasma formation and to investigate the propagation of jets through strongly interacting matter at high density is presented. Both event-by-event and inclusive measurements of physical observables can be made at midrapidity over a large solid angle ({vert bar}{eta}{vert bar}<1) with full azimuthal coverage ({Delta}{phi} = 2{pi}) and azimuthal symmetry. The detection system consists of a vertex detector and time projec… more
Date: July 1, 1990
Creator: Harris, J. W.; Bloomer, M.; Chase, S. I.; Christie, W.; Friedlander, E.; Greiner, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Broad-Beam, High Current, Metal Ion Implantation Facility

Description: We have developed a high current metal ion implantation facility with which high current beams of virtually all the solid metals of the Periodic Table can be produced. The facility makes use of a metal vapor vacuum arc ion source which is operated in a pulsed mode, with pulse width 0.25 ms and repetition rate up to 100 pps. Beam extraction voltage is up to 100 kV, corresponding to an ion energy of up to several hundred keV because of the ion charge state multiplicity; beam current is up to seve… more
Date: July 1, 1990
Creator: Brown, I. G.; Dickinson, M. R.; Galvin, J. E.; Godechot, X. & MacGill, R. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The puzzles of surface science and recent attempts to explain them

Description: Surfaces have several unique properties that remain unexplained on the atomic level. These include (1) the unique chemical activity of rough surfaces, (2) the breaking of chemical bonds in narrow temperature ranges; and (3) the role of co-adsorption and strongly adsorbed monolayers during catalysis and tribological change (friction, lubrication). The dynamic surface restructuring model and surface structure induced variations in local density of states that have been suggested to rationalize th… more
Date: July 1, 1990
Creator: Somorjai, G.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear structure studies at intermediate energies. Summary progress report, 1987--1990

Description: This report discusses the following topics: Search for dibaryon resonances; analysis of {sup 208}Pb({pi}{sup {plus_minus}},{pi}{sup {plus_minus}}) data; analysis of {sup 206,207,208}Pb(p,p{prime}) data; study of transition nuclei by (p,p{prime}); search for recoil free {delta}-production; search for low lying magnetic states; proton nucleus scattering and swelling of nucleons; measurement of spin observables in {sup 28}Si(p,p{prime}); strength of tensor force in nuclei; global analysis of (p,p{… more
Date: July 1, 1990
Creator: Hintz, N. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Materials and Chemical Sciences Division annual report 1989

Description: This report describes research conducted at Lawrence Berkeley Laboratories, programs are discussed in the following topics: materials sciences; chemical sciences; fossil energy; energy storage systems; health and environmental sciences; exploratory research and development funds; and work for others. A total of fifty eight programs are briefly presented. References, figures, and tables are included where appropriate with each program.
Date: July 1, 1990
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transport in statistical media. Final report, May 1, 1988--May 1, 1990

Description: The technical content of these five papers is summarized in this report: Benchmark results for particle transport in a binary Markov statistical medium; Statistics, renewal theory, and particle transport; asymptotic limits of a statistical transport description; renormalized equations for linear transport in stochastic media; and solution methods for discrete state Markovian initial value problems.
Date: July 1, 1990
Creator: Pomraning, G.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CP violation experiment at Fermilab

Description: The E731 experiment at Fermilab has searched for direct'' CP violation in K{sup 0} {yields} {pi}{pi}, which is parametrized by {var epsilon}{prime}/{var epsilon}. For the first time, in 20% of the data set, all four modes of the K{sub L,S} {yields} {pi}{sup +}{pi}{sup {minus}} ({pi}{sup 0}{pi}{sup 0}) were collected simultaneously, providing a great check on the systematic uncertainty. The result is Re({var epsilon}{prime}/{var epsilon}) = {minus}0.0004 {plus minus} 0.0014 (stat) {plus minus} 0… more
Date: July 1, 1990
Creator: Hsiung, Yee B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polarization Phenomena in Electromagnetic Interactions at Intermediate Energies

Description: Recent results of polarization measurements in electromagnetic interactions at intermediate energies are discussed. Prospects of polarization experiments at the new CW electron accelerators, as well as on upgraded older machines are outlined. It is concluded that polarization experiments will play a very important role in the study of the structure of the nucleon and of light nuclei.
Date: July 1, 1990
Creator: Burkert, Volker
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Is there evidence for flow in heavy ion collisions

Description: Calculations using a transverse hydrodynamical model with a phase transition in the equation of state are compared to recent heavy ion data. We argue that hydrodynamics alone cannot reproduce the low p{sub T} part of the experimental spectrum. 6 refs., 2 figs.
Date: July 1, 1990
Creator: Von Gersdorff, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electromagnetic Penetration Through Narrow Slots in Conducting Surfaces and Coupling to Structures on the Shadow Side

Description: Electromagnetic field penetration through a curved narrow slot in a planar conducting surface and coupling to a curved, loaded thin wire on the shadow side are determined in the time domain (TD) and the frequency domain (FD) by integral equation methods. Coupled integral equations are derived and solved numerically for the equivalent magnetic current in the slot and the electric current on the wire, from which the field that penetrates the slotted surface is determined. One employs a piecewise … more
Date: July 1, 1990
Creator: Reed, Erik K. & Butler, Chalmers M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Interface characterization of XUV multilayer reflectors using HRTEM (high-resolution transmission electron microscopy) and x-ray and XUV reflectance

Description: We have examined the structure of XUV multilayer coatings using high-resolution transmission electron microscopy (HRTEM). Using a variety of techniques, we have measured the interface widths and the interface topography from the digitized TEM images, and have compared these results to x-ray and XUV reflectance measurements. We find that the structural parameters measured from the TEM images and those deduced from reflectance are consistent in light of the probable systematic errors associated w… more
Date: July 1, 1990
Creator: Windt, D.L.; Hull, R.; Waskiewicz, W.K. & Kortright, J.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Current and potential distributions on a cylinder electrode

Description: This work presents the numerical solution for the current and potential distributions of a cylindrical electrode. In particular, it investigates the primary current distribution, the secondary current distribution with linearized kinetics, and the potential distribution due to constant current density on the working electrode. 16 refs., 19 figs.
Date: July 1, 1990
Creator: Grabowski, A.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lectures from the workshop on nucleon-nucleon bremsstrahlung, January 25--26, 1990

Description: The Nucleon-Nucleon Bremsstrahlung Workshop was convened at LAMPF on 25--26 January 1990 in order to review the theoretical and experimental aspects of that reaction with focus on a possible new initiative to measure neutron-proton bremsstrahlung using the intermediate-energy, white-spectrum neutron source at the LAMPF/WNR facility. Over the course of this intense day-and-a-half workshop, experts in the field established the historical perspective for both theory and experiment, presented resul… more
Date: July 1, 1990
Creator: Gibson, B. F.; Schillaci, M. E. & Wender, S. A. (comps.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Search for free quarks produced in ultra-relativistic collisions at BNL (Brookhaven National Laboratory) and CERN (European Organization for Nuclear Research)

Description: A high intensity experiment was performed to search for free quarks at BNL and CERN using ultra-relativistic beams. The experiment was designed to trap quarks in a Hg target or liquid Ar tank. No free quark candidate was found. Limits from 10{sup {minus}7} to 10{sup {minus}10} quarks per incident ion are reported. 7 refs., 2 figs., 2 tabs.
Date: July 1, 1990
Creator: Matis, H. S.; Pugh, H. G. (Lawrence Berkeley Lab., CA (USA)); Alba, G. P.; Bland, R. W.; Calloway, D. H.; Dickson, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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